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We complement and expand the existing descriptions of the Australian araneid spider Paraplectanoides crassipes Keyserling, 1886, and provide the first detailed analysis of the male palpal homologies to include examination of the expanded organ and scanning electron micrographs of the palpal sclerites. We study the placement of Paraplectanoides and the classification of the family Araneidae by combining ultraconserved elements with Sanger markers. We also added Sanger sequences of the Australian araneid genus Venomius to the molecular dataset of Scharff et al. (2020) to explore the phylogenetic placement and implications for classification of the family. We evaluate a recent proposal on the classification of the family Araneidae by Kuntner et al. (2023) in which a new family is erected for P. crassipes. Paraplectanoides is monotypic. Examination of the type material shows that Paraplectanoides kochi O. Pickard-Cambridge, 1877 is misplaced in the genus and the name is a senior synonym of the araneid Isoxya penizoides Simon, 1887 (new synonymy) that results in the new combination Isoxya kochi (O. Pickard- Cambridge, 1877). The classification of Araneidae is revised and the following nomenclatural acts are introduced: Paraplectanoididae Kuntner, Coddington, Agnarsson and Bond, 2023 is a junior synonym of Araneidae Clerck, 1757 new synonymy; phonognathines and nephilines are subfamilies of Araneidae (Subfamily Phonognathinae Simon, 1894 rank resurrected; and Subfamily Nephilinae Simon, 1894 rank resurrected). The results of our analyses corroborate the sister group relationship between Paraplectanoides and the araneid subfamily Nephilinae. Venomius is sister to the Nephilinae + Paraplectanoides clade. The placement of the oarcine araneids and Venomius renders the family Araneidae non-monophyletic if this were to be circumscribed as in Kuntner et al. (2023). In light of the paucity of data that the latter study presents, and in absence of a robust, stable and more densely sampled phylogenetic analysis of Araneidae, the changes and definitions introduced by that classification are premature and could lead to a large number of new families for what once were araneid species if the maximum-crown-clade family definitions were to be used. Consequently, we argue for restoring the familial and subfamilial classification of Araneidae of Dimitrov et al. (2017), Scharff et al. (2020) and Kallal et al. (2020). [ABSTRACT FROM AUTHOR]

A new monotypic Australian genus in the orb-weaving spider family Araneidae Clerck, 1757 is described, Venomius gen. nov., with V. tomhardyi sp. nov. as type species. Somatically, Venomius gen. nov. is similar to the typical leaf-curling orb-weaving spiders, such as Phonognatha Simon, 1894 or Leviana Framenau & Kuntner, 2022, due to a similar elongate cylindrical abdomen and colouration; however, the genital morphology of the new genus is very different. Most unusual are the presence of two strong macrosetae on the male pedipalp tibia. Male pedipalp sclerites are complex, with diagnostic characters including the tibial macrosetae and a keeled median and a rounded basal process on the stipes. The epigyne of females is wholly covered by the scape that has a short median process. Venomius tomhardyi gen. nov. et sp. nov. has been collected in southern Australia, from Tasmania to Western Australia, where it builds a circular, vertical orb-web. Spiders often hide in silk-lined hollows in branches of trees when disturbed during the day. [ABSTRACT FROM AUTHOR]

The new Australo-Pacific orb-weaving spider genus Socca is established to include 12 species from Australia: Socca pustulosa (Walckenaer, 1841) comb. nov. (type species; also present in New Zealand); S. arenasp. nov., S. australissp. nov.S. caigunasp. nov., S. elvispresleyisp. nov., S. eugenisp. nov., S. johnnywarrenisp. nov., S. kullmannisp. nov., S. levyashinisp. nov., S. pleiasp. nov., S. senicaudata (Simon, 1908) comb. nov. (= Araneus senicaudatus simplex Simon, 1908 syn. nov.) and S. sydneyica (Keyserling, 1887) comb. nov. (= Epeira inquieta Keyserling, 1887 syn. nov.). Soccagen. nov. includes medium-sised, nocturnal orb-weaving spiders. It differs from other backobourkiine genera by five tubercles posteriorly on the abdomen and a tri-partite terminal apophysis of the male pedipalp. The epigyne plate in females is about as wide as long and the scape elongate and reaches posteriorly beyond the epigyne plate. Specimens of five Soccagen. nov. species were sequenced for the mitochondrial gene cytochrome c oxidase subunit 1 (COI). The preliminary phylogeny supports our morphological species but does not confirm species-groups based on morphology and suggests that New Zealand S. pustulosacomb. nov. populations originate from south-eastern Australia. Zoobank LSID: [ABSTRACT FROM AUTHOR]

The spider genus Nemoscolus Simon, 1895 (Araneidae) has been neglected taxonomically despite the unique retreat that several species construct in their horizontal orb-webs, composed of pebbles and other detritus. The distribution of Nemoscolus is poorly known and the genus includes species from Africa and Europe. Nemoscolus is placed in Simon's Cycloseae species group along with Cyclosa Menge, 1866, Acusilas Simon, 1895, Arachnura Vinson, 1863, Witica O. Pickard-Cambridge, 1895, among others. Here we describe a new species from Queensland, Australia, N. sandersi , sp. nov., drastically expanding the distribution range of the genus. We use nucleotide sequence data to phylogenetically place Nemoscolus using model-based inference methods within Araneidae and to explore its affinities to Simon's Cycloseae. The data support propinquity of Nemoscolus with Acusilas and Arachnura but not with Cyclosa. Our analyses suggest that Cycloseae is not a clade, with Cyclosa , Acusilas , Witica and Nemoscolus not sharing a recent common ancestor. This use of an integrated granular retreat represents at least the second independent evolution of such a structure within Araneidae. These results improve our understanding of both phylogeny and retreat evolution in araneid spiders. Despite recent efforts to better understand the diversity and relationships in the orb-weaving spider family Araneidae, many taxa remain unplaced. We place Nemoscolus , a taxon notable for its retreat constructed of pebbles, in the araneid tree of life, in the subfamily including argiopines. This suggests another novel evolution of retreats in araneoid webs as well as a foundation for better understanding other members of this little-known genus. [ABSTRACT FROM AUTHOR]

The Grass Cross Spider, Argiope catenulata (Doleschall 1859), is newly recorded from Australia based on collections made in early 2019 from three dams in the vicinity of Darwin, Northern Territory. Both sexes are illustrated, as is the egg sac and habitat. Preliminary discussion is given about its introduction and dispersal. [ABSTRACT FROM AUTHOR]

As part of a current revision of the Australasian and Pacific orb-weaving spider fauna (family Araneidae Clerck, 1757), a number new combinations are proposed in the genera Acroaspis Karsch, 1878 (3 species), Carepalxis L. Koch, 1872 (1 species), Cyclosa Menge, 1866 (5 species), and Neoscona Simon, 1864 (7 species): Acroaspis lancearia (Keyserling, 1887), comb. n., A. mamillana (Keyserling, 1887), comb. n., A. scutifer (Keyserling, 1886), comb. n., Carepalxis furcifera (Keyserling, 1886), comb. n.; Cyclosa anatipes (Keyserling, 1887), comb. n.; Cyclosa apoblepta (Rainbow, 1916), comb. n.; Cyclosa argentaria (Rainbow, 1916), comb. n.; Cyclosa lichensis (Rainbow, 1916), comb. n.; Cyclosa poweri (Rainbow, 1916), comb. n.; Neoscona decolor (L. Koch, 1871), comb. n.; Neoscona enucleata (Karsch, 1879), comb. n.; Neoscona flavopunctata (L. Koch, 1871), comb. n.; Neoscona floriata (Hogg, 1914), comb. n.; Neoscona granti (Hogg, 1914), comb. n.; Neoscona inusta (L. Koch, 1871), comb. n.; and Neoscona notanda (Rainbow, 1912), comb. n. The following two Australian species, currently placed in Araneus, are not Araneidae but comb-footed spiders (family Theridiidae Sundevall, 1833): Anelosimus dianiphus (Rainbow, 1916), comb. n. and Theridion xanthostichus (Rainbow, 1916), stat. and comb. n. The following six species are considered nomina dubia as their type material is immature or otherwise unidentifiable (e.g. partly destroyed): Araneus acachmenus Rainbow, 1916; Araneus agastus Rainbow, 1916; Araneus exsertus Rainbow, 1904; Araneus suavis Rainbow, 1899; Carepalxis coronata (Rainbow, 1896); and Heurodes turritus Keyserling, 1886. Heurodes fratellus (Chamberlin, 1924) is considered a nomen dubium and Heurodes porcula (Simon, 1877) is returned to Eriovixia Archer, 1951, Eriovixia porcula (Simon, 1877). Type material of predominantly Australian species described by E. v. Keyserling (1 species), W. J. Rainbow (10 species), A. T. Urquhart (8 species), and C. A. Walckenaer (2 species) is here considered destroyed or otherwise lost. As it is impossible to identify these species from their original descriptions and considering the known spider fauna from their respective type localities, they are all considered nomina dubia: Anepsia crinita Rainbow, 1893; Epeira diabrosis (Walckenaer, 1841); Epeira diversicolor Rainbow, 1893; Epeira ficta Rainbow, 1896; Epeira hamiltoni Rainbow, 1893; Epeira lacrymosa (Walckenaer, 1841); Epeira leai Rainbow, 1894; Epeira mortoni Urquhart, 1891; Epeira notacephala Urquhart, 1891; Epeira obscurta Urquhart, 1893; Epeira phalerata Urquhart, 1893; Epeira pronuba Rainbow, 1894; Epeira rara Keyserling, 1887; Epeira singulara Urquhart, 1891; Epeira sub-flavida Urquhart, 1893; Epeira similaris Rainbow, 1896 (= Araneus urquharti Roewer, 1942 replacement name); Epeira ventriosa Urquhart, 1891; and Epeira viridula Urquhart, 1891. [ABSTRACT FROM AUTHOR]

The Australasian-Pacific and South-East Asian species of the new orb-weaving spider genus Plebs with Plebs eburnus (Keyserling, 1886) as type species are revised. Following this study, Plebs includes a total of 22 species of which seven are here described new. Seven species are found in Australia, two in the Pacific region (New Caledonia, Vanuatu), and two in South-East Asia (Papua New Guinea, The Philippines). Eleven Asian species are transferred to the new genus . Plebs represent comparatively small orb-weaving spiders of c. 1.2-15.0 mm body length with a slightly elongated abdomen and humeral (shoulder) humps. Males of most species have two to three stout setae on the ventral side of their fourth coxae. Male pedipalps are characterized by the presence of a single macroseta on the patella, the presence of a paramedian apophysis as basal extension of the conductor, and an apical tegular protrusion. The female epigyne has a scape that is generally much longer than wide. It does not have a terminal pocket and is frequently broken off in a number of species. A phylogenetic analysis of 15 species of Plebs (those for which both sexes are known), 13 Australian/Pacific orb-weaving spider species representing the most commonly collected clades with paramedian apophysis, three species of Nearctic Eriophora Simon, 1864, and Araneus diadematus Clerck, 1758, as outgroup, identified a single synapomorphy of Plebs based on 35 morphological and three behavioural characters: a distinct, inverted U-shaped light pattern on the ventral side of the abdomen with two additional white spots anterolateral to the spinnerets. This analysis recovered a monophyletic clade of all Asian Plebs, suggesting a single colonization event of the genus that putatively originated in Australia. Most Plebs species appear to be active during the day. They build a regular orb-web with vertical stabilimentum in grass and low shrubs. © 2012 The Linnean Society of London, Zoological Journal of the Linnean Society, 2012, 166, 279-341. [ABSTRACT FROM AUTHOR]

A new monotypic genus of orb-weaving spider (Araneidae Clerck, 1758) within the subfamily Araneinae Clerck, 1758 is established: Lariniophora, with L. ragnhildae (Strand, 1917) as type and sole species. The somatic morphology of Lariniophora is similar to Larinia Simon, 1874 and allied genera, however, their genitalia differ considerably. A phylogenetic analysis established close a relationship between Lariniophora and Eriophora Simon, 1864 with which it shares a paramedian apophysis as a long basal extension of the conductor in the male pedipalp. The epigyne is unique within the Araneidae and is composed of an elevated plate and a narrow long scape. Specimens of L. ragnhildae have mainly been found in arid regions of Western Australia but also in the Northern Territory, Queensland, and South Australia. Here these spiders built a conventional orb-web in low shrubs and grassland. Mature spiders have been found between February and October suggesting reproductive activity in winter. [ABSTRACT FROM AUTHOR]

The orb-weaving spider subfamily Arkyinae L. Koch, 1872 is exclusively found in the Australasian region and its taxonomy and the systematic relationships within and between genera of this subfamily are poorly understood. We here revise the arkyine genus DemadianaStrand, 1929 to include six Australian species, four of which are described as new: Demadiana simplex(Karsch, 1878) (type species), D. carrai, sp. nov., D. cerula(Simon, 1908), comb. nov., D. complicata, sp. nov., D. diabolus, sp. nov., and D. milledgei, sp. nov. A phylogenetic analysis based on an updated araneid morphological data matrix including 57 genera of orb-weaving spiders identified Demadianaas a member of the araneid subfamily Arkyinae. A separate phylogenetic analysis for the genus at the species level showed little resolution within Demadiana, but did identify a monophyletic Demadianasupported by three putative synapomorphies: small unique setal pits with spherical sockets covering the carapace, sternum and the bases of the paturon (chelicerae), an extreme elongation of the trumpet-like aggregate spigots of the posterior lateral spinnerets and a distinct curvature of the embolus. We detail several new generic and species synonymies within Arkyinae. AereaUrquhart, 1891 (type species Aerea alticephalaUrquhart, 1891) and NeoarchemorusMascord, 1968 (type species N. speechleyiMascord, 1968) are regarded as junior synonyms of ArkysWalckenaer, 1837 (type species A. lanceariusWalckenaer, 1837), resulting in Arkys speechleyi(Mascord, 1968), comb. nov. Aerea magnificaUrquhart, 1893 and Archemorus simsoniSimon, 1893 are regarded as junior synonyms of Aerea alticephalaUrquhart, 1891, and Arkys nitidicepsSimon, 1908 is proposed as a junior synonym of Arkys walckenaeriSimon, 1879. [ABSTRACT FROM AUTHOR]

A long-running debate in the spider literature concerns the function of the extra silk decorations in some spider webs. These decorations are appended to the web and constitute a highly visible signal, which is inconsistent with the trend towards web invisibility. Despite the sustained attention of researchers, the exact function of these decorations is yet to be understood. While most studies have focussed on testing particular hypotheses, there has been a dearth of natural history data regarding web decorations in field conditions. In this study we present baseline data regarding the influence of seasonality, microhabitat characteristics and ecology on the presence of web decorations in an Australian orb web spider, Argiope keyserlingi. In particular, we show that there is preference among spiders to build their webs between bushes and to face the south-east, but this preference does not influence decoration building. [ABSTRACT FROM AUTHOR]