35 results on '"Holmes, James D."'
Search Results
2. Complex axial growth patterns in an early Cambrian trilobite from South Australia
- Author
-
Holmes, James D., Paterson, John R., and García-Bellido, Diego C.
- Published
- 2021
3. Cambrian carnage: Trilobite predator-prey interactions in the Emu Bay Shale of South Australia
- Author
-
Bicknell, Russell D.C., Holmes, James D., Pates, Stephen, García-Bellido, Diego C., and Paterson, John R.
- Published
- 2022
- Full Text
- View/download PDF
4. Reassessing a cryptic history of early trilobite evolution
- Author
-
Holmes, James D. and Budd, Graham E.
- Published
- 2022
- Full Text
- View/download PDF
5. Biomechanical analyses of Cambrian euarthropod limbs reveal their effectiveness in mastication and durophagy
- Author
-
Bicknell, Russell D. C., Holmes, James D., Edgecombe, Gregory D., Losso, Sarah R., Ortega-Hernández, Javier, Wroe, Stephen, and Paterson, John R.
- Published
- 2021
6. The quest for an Australian Cambrian stage scale
- Author
-
Laurie, John R., primary, Kruse, Peter D., additional, Brock, Glenn A., additional, Holmes, James D., additional, Jago, James B., additional, Betts, Marissa J., additional, Paterson, John R., additional, and Smith, Patrick M., additional
- Published
- 2024
- Full Text
- View/download PDF
7. Comparisons between Cambrian Lagerstätten assemblages using multivariate, parsimony and Bayesian methods
- Author
-
Holmes, James D., García-Bellido, Diego C., and Lee, Michael S.Y.
- Published
- 2018
- Full Text
- View/download PDF
8. A giant species of Trilobite inhabited Australian waters half a billion years ago
- Author
-
Holmes, James D, Garcia-Bellido, Diego C, and Paterson, John
- Published
- 2019
9. Associations between trilobite intraspecific moulting variability and body proportions: Estaingia bilobata from the Cambrian Emu Bay Shale, Australia
- Author
-
Drage, Harriet B., primary, Holmes, James D., additional, García‐Bellido, Diego C., additional, and Paterson, John R., additional
- Published
- 2023
- Full Text
- View/download PDF
10. Palaeontology from Australasia and beyond: Abstracts from Palaeo Down Under3 Perth, Western Australia, July 2023
- Author
-
Martin, Sarah K., Archer, Michael, Allen, Heidi J., Badea, Daniel D., Beidatsch, Eleanor, Betts, Marissa J., Blake, Maria, Boan, Phillip C., Botha, Tory, Brock, Glenn A., Brosnan, Luke, Castle-Jones, Jack, Cramb, Jonathan, Pietri, Vanesa L. De, Donaldson, Sherri, Donato, Isabella, Dowding, Elizabeth M., Duncan, Ruairidh, Elson, Amy L., Farman, Roy M., Fergusen, Mahala A., Fjeld, Alyssa, Flannery, David, Frauenfelder, Timothy G., Gorter, John D., Gray, Michelle, Gray, Nigel, Haines, Peter, Hart, Lachlan J., Herbert, Emil B., Holland, Brooke E., Holmes, James D., Holmer, Lars, Hood, Ashleigh V.S., Ippolitov, Alexey P., Janis, Christine M., Kear, Benjamin P., Kelly, Sophie, Kitchener, Justin L., Laurie, John R., Leahey, Lucy G., Long, John A., Mantle, Daniel, Martin, David McB., Mays, Chris, McCurry, Matthew R., McGoldrick, Peter, Mensforth, Corinne L., Meyerkort, Rhys D., Nielsen-Smith, Christina A., Nel, Ryan, Newman-Martin, Jake, Oh, Yeongju, Paterson, John R., Pears, Jacob, Poropat, Stephen F., Reid, Catherine M., Reid, R. Pamela, Stretton, Stephanie A. Richter, Robertson, Ben, Ryan, Helen E., Salisbury, Steven W., Satterthwait, Donna, Schroeder, Natalie I., Shukla, Yogmaya, Slodownik, Miriam, Smith, Patrick M., Stephenson, Nile P., Surprenant, Rachel L., Thorn, Kailah M., Travouillon, Kenny J., Trinajstic, Kate M., Tripp, Madison, Vakil, Vikram, Weldon, Elizabeth A., White, Joshua, Willink, Robbert J., Wise, Gemma L., Woltz, Christina R., Young, George, Zhang, Zhiliang, Zhen, Yong Yi, and Ziegler, Tim
- Abstract
Palaeo Down Under3 (PDU3), the now quadrennial conference of the Australasian Palaeontologists(AAP) association, was held in Perth, Western Australia, from the 10th–14th of July 2023. PDU3 showcased innovative research, outreach and education initiatives being conducted across Australasia and beyond by both local and international scientists. A total of 78 talks, 17 posters and 6 plenaries were presented across the five days, and covered a wide range of topics, geological timeframes, and fossil groups. AAP is proud to publish this compilation of PDU3 abstracts to illustrate the current and ongoing strength of Australasian palaeontology.Sarah K. Martin [Sarah.Martin@dmirs.wa.gov.au], Geological Survey of Western Australia, Department of Energy, Mines, Industry Regulation and Safety, 100 Plain St, East Perth, Western Australia 6004, Australia; Michael Archer [m.archer@unsw.edu.au], School of Biological, Earth & Environmental Sciences, University of New South Wales, Sydney, New South Wales 2052, Australia; Heidi J. Allen [Heidi.allen@dmirs.wa.gov.au], Geological Survey of Western Australia, Department of Energy, Mines, Industry Regulation and Safety, 100 Plain St, East Perth, Western Australia 6004, Australia; Daniel D. Badea [badeadaniel.i13@gmail.com], Faculty of Geography and Geology, “Alexandru Ioan Cuza” University, Bulevard “Carol I”, Nr.11, 707006, Iași, Romania; Eleanor Beidatsch [ebeidats@myune.edu.au], Palaeoscience Research Centre, University of New England, Armidale, New South Wales 2351, Australia; Marissa J. Betts [mbetts7@une.edu.au], Palaeoscience Research Centre/LLUNE, University of New England, Armidale, New South Wales 2351, Australia; Maria Blake [maria.blake@monash.edu], School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, Clayton, Victoria 3800, Australia; Phillip C. Boan [pboan001@ucr.edu], University of California, Riverside, Geology 1242, 900 University Ave, Riverside, CA 92521, U.S.A.; Tory Botha [tory.botha@adelaide.edu.au], School of Biological Sciences, Molecular Life Sciences Building, North Terrace Campus, The University of Adelaide, Adelaide, South Australia 5005, Australia; Glenn A. Brock [glenn.brock@mq.edu.au], School of Natural Sciences, Macquarie University, New South Wales 2109, Australia; Luke Brosnan [Luke.Brosnan@postgrad.curtin.edu.au], WA Organic and Isotope Geochemistry Centre, The Institute for Geoscience Research, School of Earth and Planetary Sciences, Building 500, Curtin University, Kent St, Bentley, Western Australia 6102, Australia; Jack Castle-Jones [jack.jones1@students.mq.edu.au], School of Natural Sciences, Macquarie University, New South Wales 2109, Australia; Jonathan Cramb [jonathan.cramb@qm.qld.gov.au], Queensland Museum, PO Box 3300, South Brisbane BC, Queensland 4101, Australia; Vanesa L. De Pietri [vanesa.depietri@canterbury.ac.nz], School of Earth and Environment, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand; Sherri Donaldson [sherri.donaldson.oz@gmail.com], School of Geosciences, University of Edinburgh, Grant Institute, The King’s Buildings, James Hutton Road, Edinburgh, EH9 3FE, Scotland, U.K.; Elizabeth M. Dowding [dowdingem@gmail.com], Friedrich-Alexander-Universität Erlangen-Nürnberg, Loewenichstraße 28 91054 Erlangen, Germany; Ruairidh Duncan [ruairidh.duncan@monash.edu], Evans EvoMorph Lab, Room 226, 18 Innovation Walk, School of Biological Sciences, Monash University, Clayton, Victoria 3800, Australia; Amy L. Elson [amy.elson@curtin.edu.au], WA Organic and Isotope Geochemistry Centre, The Institute for Geoscience Research, School of Earth and Planetary Sciences, Building 500, Curtin University, Kent St, Bentley, Western Australia 6102, Australia; Roy M. Farman [r.farman@unsw.edu.au], School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, New South Wales 2052, Australia; Mahala A. Fergusen [mahala.fergusen@adelaide.edu.au], School of Biological Sciences, Benham Building, North Terrace Campus, The University of Adelaide, Adelaide, South Australia 5005, Australia; Alyssa Fjeld [alyssa.fjeld@monash.edu], School of Biological Sciences, 18 Innovation Walk, Monash University, Clayton, Victoria 3800, and School of Natural Sciences, Macquarie University, New South Wales 2109, Australia; David Flannery [david.flannery@qut.edu.au], School of Earth and Atmospheric Sciences, Queensland University of Technology, 2 George St, Brisbane, Queensland 4000, Australia; Timothy G. Frauenfelder [timothy.frauenfelder@gmail.com], University of New England, Armidale, New South Wales 2351, Australia; John D. Gorter [johngorter1@gmail.com], PO Box 711, Claremont, Western Australia 6910, Australia; Michelle Gray [m.gray@research.deakin.edu.au], School of Life and Environmental Sciences, Deakin University, Geelong, Victoria 3216, Australia; Nigel Gray [nlg2225@gmail.com], GPO Box 2902, Brisbane, Queensland 4001, Australia; Peter Haines [peter.haines@dmirs.wa.gov.au], Geological Survey of Western Australia, Department of Energy, Mines, Industry Regulation and Safety, 100 Plain St, East Perth, Western Australia 6004, Australia; Lachlan J. Hart [lachlan.hart@australian.museum], Australian Museum Research Institute, 1 William Street, Sydney, New South Wales 2010, Australia; Brooke E. Holland [b.holland@uq.net.au], School of Biological Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia; James D. Holmes [jamesholmes83@gmail.com], Department of Earth Sciences, Palaeobiology, Uppsala University, Villavägen 16, Uppsala 752 36, Sweden; Lars Holmer [lars.holmer@pal.uu.se], Department of Earth Sciences, Palaeobiology, Uppsala University, Villavägen 16, Uppsala 752 36, Sweden; Ashleigh V.S. Hood [ashleigh.hood@unimelb.edu.au], School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Parkville, Victoria 3010, Australia; Alexey P. Ippolitov [ippolitov.ap@gmail.com], School of Geography, Environment and Earth Sciences, Victoria University of Wellington | Te Herenga Waka, 21 Kelburn Parade, Wellington 6012, New Zealand; Christine M. Janis [christine_janis@brown.edu], Bristol Palaeobiology Group, School of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, U.K.; Benjamin P. Kear [benjamin.kear@em.uu.se], The Museum of Evolution, Uppsala University, Norbyvägen 16, SE-752 36 Uppsala, Sweden; Sophie Kelly [sophie.kelly@pg.canterbury.ac.nz], School of Earth and Environment, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand; Justin L. Kitchener [jkitche3@myune.edu.au], School of Environmental and Rural Science, University of New England, Armidale, New South Wales 2351, Australia; John R. Laurie [john.r.laurie@gmail.com], Geoscience Australia, Symonston, Australian Capital Territory 2601, and School of Natural Sciences, Macquarie University, North Ryde, New South Wales 2109, Australia; Lucy G. Leahey [lucyleahey@hotmail.com], The University of Queensland, Brisbane, Queensland 4072, Australia; John A. Long [john.long@flinders.edu.au], College of Science and Engineering, Flinders University, PO Box 2100, Adelaide, South Australia 5001, Australia; Daniel Mantle [dan.mantle@mgpalaeo.com.au], MGPalaeo, Unit 1, 5 Arvida Street, Malaga, Western Australia 6090, Australia; David McB. Martin [david.martin@dmirs.wa.gov.au], Geological Survey of Western Australia, Department of Energy, Mines, Industry Regulation and Safety, 100 Plain St, East Perth, Western Australia 6004, Australia; Chris Mays [cmays@ucc.ie], School of Biological, Earth and Environmental Sciences, Environmental Research Institute, University College Cork, Distillery Fields, Cork T23 N73K, Ireland; Matthew R. McCurry [matthew.mccurry@austmus.gov.au], Australian Museum, 1 William St, Sydney, New South Wales 2010, Australia; Peter McGoldrick [p.mcgoldrick@utas.edu.au], CODES, University of Tasmania, Locked Bag 66, Hobart, Tasmania 7001, Australia; Corinne L. Mensforth [mens0009@flinders.edu.au], Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia; Rhys D. Meyerkort [meyerkortr@gmail.com], University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia; Christina Nielsen-Smith [c.nielsensmith@uq.net.au], School of Biological Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia; Ryan Nel [ryan2nel@gmail.com], Geology Department, Rhodes University, Grahamstown, South Africa; Jake Newman-Martin [jake.newman-martin@student.curtin.edu.au], Curtin University, Kent St, Bentley, Western Australia 6102, Australia; Yeongju Oh [yjoh@kopri.re.kr], Division of Earth Sciences, Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, 21990 Incheon, Republic of Korea, and Polar Science, University of Science and Technology, Daejeon, 34113, Republic of Korea; John R. Paterson [jpater20@une.edu.au], Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, New South Wales 2351, Australia; Jacob Pears [J.pears@imperial.ac.uk], School of Molecular and Life Sciences, Curtin University, Kent St, Bentley, Western Australia 6102, Australia; Stephen F. Poropat [steve.poropat@curtin.edu.au], Western Australian Organic and Isotope Geochemistry Centre, School of Earth and Planetary Science, Curtin University, Kent St, Bentley, Western Australia 6102, and Australian Age of Dinosaurs Museum of Natural History, Winton, Queensland 4735, Australia; Catherine M. Reid [catherine.reid@canterbury.ac.nz], School of Earth and Environment, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand; R. Pamela Reid [preid@rsmas.miami.edu], Department of Marine Geosciences, Rosenstiel School of Marine, Atmospheric, and Earth Science, University of Miami, Miami, FL 33149, U.S.A., and Bahamas Marine EcoCentre, Miami, FL 33158, U.S.A.; Stephanie A. Richter Stretton [srichte2@myune.edu.au], Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, New South Wales 2351, Australia; Ben Robertson [ben.t.robertson@adelaide.edu.au], School of Physics, Chemistry and Earth Sciences, Mawson Building Room 107, University of Adelaide, North Terrace Campus, Adelaide, South Australia 5005, Australia; Helen E. Ryan [helen.ryan@museum.wa.gov.au], Department of Earth and Planetary Sciences, Western Australian Museum, 49 Kew Street, Welshpool, Western Australia 6106, Australia; Steven W. Salisbury [s.salisbury@uq.edu.au], School of Biological Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia; Donna Satterthwait [Donna.Satterthwait@utas.edu.au], CODES, University of Tasmania, Locked Bag 66, Hobart, Tasmania 7001, Australia; Natalie I. Schroeder [Natalie.Schroeder@ga.gov.au], Geoscience Australia, GPO Box 378, Canberra, Australian Capital Territory 2601, Australia; Yogmaya Shukla [yogmayashukla@bsip.res.in; yogmayashukla@gmail.com], Birbal Sahni Institute of Palaeosciences, Lucknow-226007, India; Miriam Slodownik [miriam.slodownik@adelaide.edu.au], School of Biological Sciences, University of Adelaide, North Terrace, South Australia 5005, Australia; Patrick M. Smith [Patrick.Smith@austmus.gov.au], Australian Museum, 1 William St, Sydney, New South Wales 2010, Australia, and Department of Biological Sciences, Macquarie University, Sydney, New South Wales 2109, Australia; Nile P. Stephenson [nps36@cam.ac.uk], Department of Zoology, Downing Pl, University of Cambridge, CB2 3EJ, U.K.; Rachel L. Surprenant [rsurp001@ucr.edu], University of California Riverside, 900 University Ave, Riverside, CA 92521, U.S.A.; Kailah M. Thorn [Kailah.thorn@museum.wa.gov.au], Department of Terrestrial Vertebrates, Western Australia Museum, 49 Kew Street, Welshpool, Western Australia 6101, Australia; Kenny J. Travouillon [kenny.travouillon@museum.wa.gov.au], Western Australian Museum, 49 Kew Street, Welshpool, Western Australia 6101, Australia; Kate M. Trinajstic [K.Trinajstic@curtin.edu.au], School of Molecular and Life Sciences, Curtin University, Kent Street, Bentley, Western Australia 6102, Australia; Madison Tripp [madison.tripp@postgrad.curtin.edu.au], Organic and Isotope Geochemistry Centre, School of Earth and Planetary Science, Curtin University, Kent St, Bentley, Western Australia 6102, Australia; Vikram Vakil [vikram.vakil@uqconnect.edu.au], School of Earth and Environmental Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia; Elizabeth A. Weldon [l.weldon@deakin.edu.au], School of Life and Environmental Sciences, Deakin University, Geelong, Victoria 3216, Australia; Joshua White [Joshua.white@anu.edu.au], Research School of Physics, Department of Materials Physics, Australian National University, Canberra, Australian Capital Territory 2601, and Australian Museum Research Institute, 1 William Street, Sydney, New South Wales 2010, Australia; Robbert J. Willink [robblink@ozemail.com.au], 11 Coral Sea Court, Sunshine Beach, Queensland 4567, Australia; Gemma L. Wise [g.wise@uq.net.au], School of Biological Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia; Christina R. Woltz [cwoltz@stanford.edu], Department of Earth and Planetary Sciences, Stanford University, 450 Jane Stanford Way, Stanford, CA 94305-2115, U.S.A; George Young [george.young@pg.canterbury.ac.nz], School of Earth and Environment, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; Zhiliang Zhang[zhiliang.zhang@nigpas.ac.cn], Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China; Yong Yi Zhen [yong-yi.zhen@regional.nsw.gov.au], Geological Survey of New South Wales, 947–953 Londonderry Road, Londonderry, New South Wales 2753, Australia; Tim Ziegler [tziegler@museum.vic.gov.au], Museums Victoria Research Institute, GPO Box 666, Melbourne, Victoria 3001, Australia.
- Published
- 2024
- Full Text
- View/download PDF
11. Contrasting patterns of disparity suggest differing constraints on the evolution of trilobite cephalic structures during the Cambrian 'explosion'
- Author
-
Holmes, James D. and Holmes, James D.
- Abstract
Trilobites are an abundant group of Palaeozoic marine euarthropods that appear abruptly in the fossil record c. 521 million years ago. Quantifying the development of morphological variation (or 'disparity') through time in fossil groups like trilobites is critical in understanding evolutionary radiations such as the Cambrian 'explosion'. Here, I use geometric morphometrics to quantify 'cumulative disparity' in functionally-important structures within the trilobite cephalon across their initial radiation during Cambrian Series 2. Overall cephalic disparity increased rapidly and attained a maximum within several million years. This pattern is dominated by the cephalic outline (in particular the genal spines), reflecting rapid, convergent expansion to the extremes of morphospace in a few early families. In contrast, removing the outline and focusing on structures such as the glabella and eye ridges (associated with feeding and vision, respectively) showed a more gradual increase in disparity, closer in line with taxonomic diversity and supporting the hypothesis of a relatively accurate trilobite fossil record. These contrasting patterns suggest that disparity in different structures was constrained in different ways, with extrinsic (ecological) factors probably having the major impact on overall disparity. It also implies that patterns of disparity in isolated substructures cannot necessarily be taken individually as representative of overall morphologies.
- Published
- 2023
- Full Text
- View/download PDF
12. Associations between trilobite intraspecific moulting variability and body proportions : Estaingia bilobata from the Cambrian Emu Bay Shale, Australia
- Author
-
Drage, Harriet B., Holmes, James D., Garcia-Bellido, Diego C., Paterson, John R., Drage, Harriet B., Holmes, James D., Garcia-Bellido, Diego C., and Paterson, John R.
- Abstract
Trilobites were notably flexible in the moulting behaviours they employed, producing a variety of moult configurations preserved in the fossil record. Investigations seeking to explain this moulting variability and its potential impacts are few, despite abundant material being available for study. We present the first quantitative study on moulting in a single trilobite species using a dataset of almost 500 moult specimens of Estaingia bilobata from the Cambrian (Series 2, Stage 4) Emu Bay Shale, South Australia. Specimens were categorized by moulting mode (Salter's or Sutural Gape) and their associated configurations, and their body proportions measured from both a museum collection (including a bycatch sample) and a randomly-collected field sample. This enabled analysis of the proportion of E. bilobata specimens displaying the Sutural Gape and Salter's modes of moulting and their different configurations, and tests for association between moulting behaviour and body proportions. The results show a wide range of E. bilobata moulting configurations in all samples, suggesting that configurations represent definable instances in a largely continuous spectrum of variation. Analyses comparing body proportions of specimens showing the two modes of moulting were non-significant, suggesting there is no true association between moulting behaviour and body proportion, except for a single significant result for body length. All results were relatively consistent between the museum and field samples. However, removing accessioned specimens from the museum sample brought results even further in line with the field sample, supporting the need for consideration of museum collection bias in palaeontological analyses.
- Published
- 2023
- Full Text
- View/download PDF
13. Reassessing growth and mortality estimates for the Ordovician trilobite Triarthrus eatoni
- Author
-
Pauly, Daniel, Holmes, James D., Pauly, Daniel, and Holmes, James D.
- Abstract
A length–frequency sample (n = 295) from a fossil population of the Ordovician trilobite Triarthrus eatoni Hall, 1838, assembled and analyzed by J. L. Cisne in 1973 is here reexamined using methods of length–frequency analysis commonly used in fishery science and marine biology. Theoretical considerations and the empirical data at hand suggest that the growth of T. eatoni was not “linear,” but asymptotic, as is the growth of most Recent marine invertebrates. The parameters of the von Bertalanffy growth function (L∞ = 41 mm, K = 0.29 yr−1) suggest that T. eatoni, which apparently lived in a challenging environment, grew somewhat more slowly than the extant marine isopod Ceratoserolis trilobitoides (Eights, 1833), used here as Recent analogue to T. eatoni. This trilobite probably lived up to 10 years, rather than the suggested 4 years, and its mortality rate was 15%–20% per year rather than 30%–40% per year. These represent the first estimates of trilobite absolute growth characteristics using methods known to accurately model growth in extant water-breathing ectotherms. These provide a baseline for trilobite growth that can be used to make inferences about growth in other species. The approach used here may also be applied to other trilobites for which suitable length–frequency data exist.
- Published
- 2023
- Full Text
- View/download PDF
14. Malformed individuals of the trilobite Estaingia bilobata from the Cambrian Emu Bay Shale and their palaeobiological implications
- Author
-
Bicknell, Russell DC, Holmes, James D, García-Bellido, Diego C, Paterson, John R, Bicknell, Russell DC, Holmes, James D, García-Bellido, Diego C, and Paterson, John R
- Published
- 2023
- Full Text
- View/download PDF
15. Contrasting patterns of disparity suggest differing constraints on the evolution of trilobite cephalic structures during the Cambrian ‘explosion’
- Author
-
Holmes, James D., primary
- Published
- 2023
- Full Text
- View/download PDF
16. Malformed individuals of the trilobiteEstaingia bilobatafrom the Cambrian Emu Bay Shale and their palaeobiological implications
- Author
-
Bicknell, Russell DC, primary, Holmes, James D, additional, García-Bellido, Diego C, additional, and Paterson, John R, additional
- Published
- 2023
- Full Text
- View/download PDF
17. Professor
- Author
-
Pauly, Daniel and Holmes, James D.
- Subjects
Length-frequency analysis, ELEFAN, GOLT, oxygen, respiration, von Bertalanffy - Abstract
Supplementary Materials (text and 2 figures) to Re-assessing growth and mortality estimates for the Ordovician trilobite Triarthus eatoni to be published in the journal Paleontology (June/July 2022)
- Published
- 2022
- Full Text
- View/download PDF
18. Reassessing growth and mortality estimates for the Ordovician trilobite Triarthrus eatoni
- Author
-
Pauly, Daniel, primary and Holmes, James D., additional
- Published
- 2022
- Full Text
- View/download PDF
19. Cambrian carnage : Trilobite predator-prey interactions in the Emu Bay Shale of South Australia
- Author
-
Bicknell, Russell D. C., Holmes, James D., Pates, Stephen, Garcia-Bellido, Diego C., Paterson, John R., Bicknell, Russell D. C., Holmes, James D., Pates, Stephen, Garcia-Bellido, Diego C., and Paterson, John R.
- Abstract
The Cambrian explosion represents the rapid emergence of complex marine ecosystems on Earth. The propagation of predator-prey interactions within these systems was almost certainly one of the major drivers of this evolutionary event, sparking an arms race that promoted the proliferation of biomineralised exoskeletons and shells, and the evolution of the first durophagous (shell-crushing) predators. The most commonly documented evidence of Cambrian durophagous predation comes from injured trilobites. However, quantitative analysis based on multiple specimens from single localities is lacking. Such studies are required to reveal the dynamics of ancient predator-prey systems at fine ecological scales (e.g. at the population or community level). This study documents injured specimens of two trilobite species, Redlichia takooensis and Redlichia rex, from the Emu Bay Shale Konservat-Lagersta center dot tte (Cambrian Series 2, Stage 4) on Kangaroo Island, South Australia. A total of 38 injured specimens exhibiting various healed cephalic and thoracic injuries are documented, in addition to the mangled remains of two individuals that probably resulted from the activities of a durophagous predator or scavenger. Specimens of both species show that most injuries are located on the posterior portion of the thorax, indicating that predators preferentially attacked from behind and/or prey individuals presented the posterior of the trunk towards the predator when threatened or fleeing. The larger sample of injured R. takooensis shows that while unilateral injuries are more common than bilateral ones, there is no evidence for a left-or right-side bias, contrasting with previous suggestions that Cambrian trilobites exhibit right-sided injury stereotypy. Comparing the position of injured and non-injured R. takooensis and R. rex in bivariate space, we illustrate that injured specimens of both species typically represent some of the largest individuals of these taxa. This suggests that
- Published
- 2022
- Full Text
- View/download PDF
20. Biomechanical analyses of Cambrian euarthropod limbs reveal their effectiveness in mastication and durophagy.
- Author
-
Bicknell, Russell D. C., Holmes, James D., Edgecombe, Gregory D., Losso, Sarah R., Ortega-Hernández, Javier, Wroe, Stephen, and Paterson, John R.
- Subjects
- *
LIMULUS polyphemus , *MASTICATION , *FOOD chains , *PREDATION , *ARMS race - Abstract
Durophagy arose in the Cambrian and greatly influenced the diversification of biomineralized defensive structures throughout the Phanerozoic. Spinose gnathobases on protopodites of Cambrian euarthropod limbs are considered key innovations for shell-crushing, yet few studies have demonstrated their effectiveness with biomechanical models. Here we present finite-element analysis models of two Cambrian trilobites with prominent gnathobases—Redlichia rex and Olenoides serratus—and compare these to the protopodites of the Cambrian euarthropod Sidneyia inexpectans and the modern American horseshoe crab, Limulus polyphemus. Results show that L. polyphemus, S. inexpectans and R. rex have broadly similar microstrain patterns, reflecting effective durophagous abilities. Conversely, low microstrain values across the O. serratus protopodite suggest that the elongate gnathobasic spines transferred minimal strain, implying that this species was less well-adapted to masticate hard prey. These results confirm that Cambrian euarthropods with transversely elongate protopodites bearing short, robust gnathobasic spines were likely durophages. Comparatively, taxa with shorter protopodites armed with long spines, such as O. serratus, were more likely restricted to a soft food diet. The prevalence of Cambrian gnathobase-bearing euarthropods and their various feeding specializations may have accelerated the development of complex trophic relationships within early animal ecosystems, especially the 'arms race' between predators and biomineralized prey. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
21. Supplemental Data 1 - 3 from Biomechanical analyses of Cambrian euarthropod limbs reveal their effectiveness in mastication and durophagy
- Author
-
Bicknell, Russell D. C., Holmes, James D., Edgecombe, Gregory D., Losso, Sarah R., Ortega-Hernández, Javier, Wroe, Stephen, and Paterson, John R.
- Abstract
Supplemental Data 1: Micro-CT scanning conditions for analysed Limulus polyphemus appendages; Supplemental Data 2: Volume size and triangle counts for analysed models; Supplemental Data 3: Summary of the muscle and force data used for FEMs. Taken from Bicknell et al. (2018).
- Published
- 2021
- Full Text
- View/download PDF
22. Growth gradient model fitting procedures and supplementary figures from Complex axial growth patterns in an Early Cambrian trilobite from South Australia
- Author
-
Holmes, James D., Paterson, John R., and Garc��a-Bellido, Diego C.
- Subjects
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING - Abstract
This .pdf file contains model fitting procedures for the growth gradient analysis, and supplementary figures and table.
- Published
- 2021
- Full Text
- View/download PDF
23. Ontogeny of the trilobite Redlichia from the lower Cambrian (Series 2, Stage 4) Ramsay Limestone of South Australia
- Author
-
Holmes, James D., primary, Paterson, John R., additional, Jago, James B., additional, and García-Bellido, Diego C., additional
- Published
- 2020
- Full Text
- View/download PDF
24. Articulated trilobite ontogeny: suggestions for a methodological standard
- Author
-
Hughes, Nigel C., primary, Adrain, Jonathan M., additional, Holmes, James D., additional, Hong, Paul S., additional, Hopkins, Melanie J., additional, Hou, Jin-Bo, additional, Minelli, Alessandro, additional, Park, Tae-Yoon S., additional, Paterson, John R., additional, Peng, Jin, additional, Webster, Mark, additional, Zhang, Xi-Guang, additional, Zhang, Xing-Liang, additional, and Fusco, Giuseppe, additional
- Published
- 2020
- Full Text
- View/download PDF
25. The post‐embryonic ontogeny of the early Cambrian trilobite Estaingia bilobata from South Australia: trunk development and phylogenetic implications
- Author
-
Holmes, James D., primary, Paterson, John R., additional, and García‐Bellido, Diego C., additional
- Published
- 2020
- Full Text
- View/download PDF
26. The trilobite Redlichia from the lower Cambrian Emu Bay Shale Konservat-Lagerstätte of South Australia: systematics, ontogeny and soft-part anatomy
- Author
-
Holmes, James D., Paterson, John R., and García-Bellido, Diego C.
- Abstract
The trilobite Redlichia Cossmann, 1902 is an abundant element of the lower Cambrian (Series 2, Stage 4) Emu Bay Shale (EBS) Konservat-Lagerstätte on Kangaroo Island, South Australia. Well-preserved, fully articulated specimens from this deposit are known to reach lengths of up to 25 cm, representing one of the largest known Cambrian trilobites. Until now, all Redlichia specimens from the EBS have been referred to Redlichia takooensis Lu, 1950, a species originally described from South China. Previous work recognized considerable differences in exoskeletal morphology among specimens of varying sizes, which was attributed to ontogeny. However, close examination of a large collection of recently acquired specimens shows that this variation actually represents two distinct morphs, interpreted here as separate species: R. takooensis, and a large, new species, Redlichia rex sp. nov. An analysis of morphological variation in holaspides (‘adults’) of the more common R. takooensis reveals considerable ontogenetic change occurred even during this later phase of growth. Some specimens of both Redlichia species from the EBS also exhibit exceptionally preserved soft-part anatomy, particularly the antennae and biramous appendages. Here, appendages (antenniform and biramous) and digestive structures are described, and biramous appendage reconstructions of R. rex sp. nov. are presented, which show a striking resemblance to some early Cambrian trilobites from South China. In particular, R. rex has a tripartite exopodite, as well as a dorsoventrally deep protopodite with gnathobasic spines used to shred or crush food items. Based on recent phylogenetic analyses, it is possible that an exopodite with tripartite subdivisions represents the plesiomorphic condition for Artiopoda (trilobites and kin). The digestive system of R. takooensis exhibits a series of paired digestive glands in the cephalon and anterior thorax, similar to those described for a number of other Cambrian and Ordovician trilobites. http://zoobank.org/urn:lsid:zoobank.org:pub:507BEAFC-4AFA-43F4-A5C4-49E4B58C658E
- Published
- 2019
- Full Text
- View/download PDF
27. The trilobiteRedlichiafrom the lower Cambrian Emu Bay Shale Konservat-Lagerstätte of South Australia: systematics, ontogeny and soft-part anatomy
- Author
-
Holmes, James D., primary, Paterson, John R., additional, and García-Bellido, Diego C., additional
- Published
- 2019
- Full Text
- View/download PDF
28. Ontogeny of the trilobite Redlichia from the lower Cambrian (Series 2, Stage 4) Ramsay Limestone of South Australia.
- Author
-
Holmes, James D., Paterson, John R., Jago, James B., and García-Bellido, Diego C.
- Subjects
- *
TRILOBITES , *FOSSIL arthropods , *CAMBRIAN Period , *LIMESTONE , *ONTOGENY - Abstract
Studies that reveal detailed information about trilobite growth, particularly early developmental stages, are crucial for improving our understanding of the phylogenetic relationships within this iconic group of fossil arthropods. Here we document an essentially complete ontogeny of the trilobite Redlichia cf. versabunda from the Cambrian Series 2 (late Stage 4) Ramsay Limestone of Yorke Peninsula in South Australia, including some of the best-preserved protaspides (the earliest biomineralized trilobite larval stage) known for any Cambrian trilobite. These protaspid stages exhibit similar morphological characteristics to many other taxa within the Suborder Redlichiina, especially to closely related species such as Metaredlichia cylindrica from the early Cambrian period of China. Morphological patterns observed across early developmental stages of different groups within the Order Redlichiida are discussed. Although redlichiine protaspides exhibit similar overall morphologies, certain ontogenetic characters within this suborder have potential phylogenetic signal, with different superfamilies characterized by unique trait combinations in these early growth stages. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
29. The post‐embryonic ontogeny of the early Cambrian trilobite Estaingia bilobata from South Australia: trunk development and phylogenetic implications.
- Author
-
Holmes, James D., Paterson, John R., García‐Bellido, Diego C., and Zhang, Xi‐Guang
- Subjects
TRILOBITES ,BIOLOGICAL evolution ,ONTOGENY ,NUMBERS of species ,BIOTIC communities ,SHALE - Abstract
Trilobites are one of the most diverse and abundant fossil groups from the early Palaeozoic, and as such are useful for answering important questions about early animal evolution, including developmental processes. Ontogenetic information for a large number of trilobite species has been published, but cases where multiple articulated specimens are known across the full range of developmental stages are rare. The early Cambrian (Series 2, Stage 4) Emu Bay Shale biota from Kangaroo Island (South Australia) is numerically dominated by trilobites, particularly articulated specimens of the ellipsocephaloid Estaingia bilobata, which are present in densities of >600 individuals per square metre on certain bedding planes. Here we describe the essentially complete post‐embryonic ontogenetic series of E. bilobata from the Emu Bay Shale, and investigate patterns of growth relating to articulation and segmentation in this early Cambrian arthropod. Estaingia bilobata exhibits the hypoprotomeric mode of growth, with the epimorphic phase (the cessation of trunk segment generation) reached prior to the onset of the holaspid period. The meraspid pygidium had an extended equilibrium period in which anterior segment release into the thorax was matched by subterminal segment generation. Previously undocumented morphological features of E. bilobata, including the hypostome and bispinose pleural tips in holaspides, are also described. The growth characteristics and morphological features of E. bilobata documented herein strengthen close phylogenetic relationships between the Estaingiidae, Ellipsocephalidae and Xystriduridae. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
30. Aquatic adaptations in the four limbs of the snake-like reptile Tetrapodophis from the Lower Cretaceous of Brazil
- Author
-
Lee, Michael S.Y., Palci, Alessandro, Jones, Marc E.H., Caldwell, Michael W., Holmes, James D., and Reisz, Robert R.
- Published
- 2016
- Full Text
- View/download PDF
31. The trilobite Redlichia from the lower Cambrian Emu Bay Shale Konservat-Lagerstätte of South Australia: systematics, ontogeny and soft-part anatomy.
- Author
-
Holmes, James D., Paterson, John R., and García-Bellido, Diego C.
- Subjects
- *
TRILOBITES , *SHALE , *ANATOMY , *ONTOGENY , *DIGESTIVE organs , *FISH anatomy , *BAYS - Abstract
The trilobite Redlichia Cossmann, 1902 is an abundant element of the lower Cambrian (Series 2, Stage 4) Emu Bay Shale (EBS) Konservat-Lagerstätte on Kangaroo Island, South Australia. Well-preserved, fully articulated specimens from this deposit are known to reach lengths of up to 25 cm, representing one of the largest known Cambrian trilobites. Until now, all Redlichia specimens from the EBS have been referred to Redlichia takooensis Lu, 1950, a species originally described from South China. Previous work recognized considerable differences in exoskeletal morphology among specimens of varying sizes, which was attributed to ontogeny. However, close examination of a large collection of recently acquired specimens shows that this variation actually represents two distinct morphs, interpreted here as separate species: R. takooensis, and a large, new species, Redlichia rex sp. nov. An analysis of morphological variation in holaspides ('adults') of the more common R. takooensis reveals considerable ontogenetic change occurred even during this later phase of growth. Some specimens of both Redlichia species from the EBS also exhibit exceptionally preserved soft-part anatomy, particularly the antennae and biramous appendages. Here, appendages (antenniform and biramous) and digestive structures are described, and biramous appendage reconstructions of R. rex sp. nov. are presented, which show a striking resemblance to some early Cambrian trilobites from South China. In particular, R. rex has a tripartite exopodite, as well as a dorsoventrally deep protopodite with gnathobasic spines used to shred or crush food items. Based on recent phylogenetic analyses, it is possible that an exopodite with tripartite subdivisions represents the plesiomorphic condition for Artiopoda (trilobites and kin). The digestive system of R. takooensis exhibits a series of paired digestive glands in the cephalon and anterior thorax, similar to those described for a number of other Cambrian and Ordovician trilobites. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
32. An exceptional record of Cambrian trilobite moulting behaviour preserved in the Emu Bay Shale, South Australia
- Author
-
Drage, Harriet B., primary, Holmes, James D., additional, García‐Bellido, Diego C., additional, and Daley, Allison C., additional
- Published
- 2018
- Full Text
- View/download PDF
33. AN INTRODUCTORY COURSE IN THE FIELD OF ELECTRONIC DATA PROCESSING.
- Author
-
Holmes, James D. J.
- Subjects
CURRICULUM ,STUDY & teaching of electronic data processing ,ACCOUNTING education ,ELECTRONIC data processing ,COMPUTER programming education ,DATA processing service centers ,ACCOUNTING ,BUSINESS education ,COLLEGE students - Abstract
The University of Mississippi, Oxford, Mississippi is extremely fortunate in having a computer installation comprised of the IBM 630 computer and auxiliary equipment. A course in electronic data processing was established in the School of Commerce and Business Administration in February, 1959. The course is entitled Business Data Processing, and carries three semester hours credit. It is being offered at the junior level to any student having a minimum of nine hours of accounting. Since the majority of students in the School are required to take nine hours of accounting, no particular major field of study is precluded from participation in the course. Based on the assumption that not only accounting but other fields would be represented in the student enrollment, it appeared that the introductory portion of the course should be similar to the systems course required of all accounting majors. It is believed that the student will have a better background for the computer portion of the course if he has first been grounded in manual and punched card systems. Also, it will insure that all students will be exposed to an equal amount of material regarding manual and punched card systems.
- Published
- 1959
34. Systems and Procedures for Automated Accounting (Book).
- Author
-
Holmes, James D. J.
- Subjects
ACCOUNTING ,NONFICTION - Abstract
Reviews the book "Systems and Procedures for Automated Accounting," by Clarence B. Randall, Sally W. Weiner and Maynard S. Greenfield.
- Published
- 1963
35. Ontogeny of the trilobite Redlichia from the lower Cambrian (Series 2, Stage 4) Ramsay Limestone of South Australia
- Author
-
John R. Paterson, James B. Jago, Diego C. García-Bellido, James D. Holmes, Holmes, James D, Paterson, John R, Jago, James B, and Garcia-Bellido, Diego C
- Subjects
Redlichiida ,010506 paleontology ,biology ,early Cambrian ,proaspid ,Redlichiidae ,Geology ,Redlichia ,010502 geochemistry & geophysics ,biology.organism_classification ,01 natural sciences ,Redlichiina ,Trilobite ,meraspid ,Stage (stratigraphy) ,Evolutionary biology ,arthropod ,Arthropod ,Cambrian Series 2 ,Metaredlichia ,0105 earth and related environmental sciences - Abstract
Studies that reveal detailed information about trilobite growth, particularly early developmental stages, are crucial for improving our understanding of the phylogenetic relationships within this iconic group of fossil arthropods. Here we document an essentially complete ontogeny of the trilobite Redlichia cf. versabunda from the Cambrian Series 2 (late Stage 4) Ramsay Limestone of Yorke Peninsula in South Australia, including some of the best-preserved protaspides (the earliest biomineralized trilobite larval stage) known for any Cambrian trilobite. These protaspid stages exhibit similar morphological characteristics to many other taxa within the Suborder Redlichiina, especially to closely related species such as Metaredlichia cylindrica from the early Cambrian period of China. Morphological patterns observed across early developmental stages of different groups within the Order Redlichiida are discussed. Although redlichiine protaspides exhibit similar overall morphologies, certain ontogenetic characters within this suborder have potential phylogenetic signal, with different superfamilies characterized by unique trait combinations in these early growth stages.
- Published
- 2021
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.