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New species of Liostracina Monke, 1903 (Trilobita, Cambrian) from Yunnan, China: complete holaspid exoskeleton and implications for higher level classification.
- Source :
-
Journal of Paleontology . Nov2022, Vol. 96 Issue 6, p1431-1446. 16p. - Publication Year :
- 2022
-
Abstract
- The trilobite Liostracina has been recognized as important in taxonomic and stratigraphic studies for more than a century. Until now, the genus Liostracina and family Liostracinidae have been known from only incomplete holaspid material, a degree 2 meraspis, and protaspides. A new locality in the Longha Formation (Cambrian: Guzhangian) of southeastern Yunnan, China, yields a rich collection of articulated holaspid exoskeletons and disarticulated sclerites of a new species, Liostracina fuluensis n. sp. These specimens reveal thoracic and ventral morphology that was previously unknown for Liostracina; they demonstrate that it has a rostral plate plus rostral and connective sutures, rather than a ventral median suture on the cephalic doublure. This confirms a natant hypostomal condition for the genus. Holaspid exoskeletal features, combined with evidence of a non-asaphoid-type protaspis, indicate that Liostracina is neither a primitive trinucleoid nor a primitive asaphoid. The family Liostracinidae is excluded from the superfamily Trinucleoidea and the order Trinucleida and reassigned to the order Ptychopariida. UUID: http://zoobank.org/48dcbe31-e25d-4657-8441-732d5ea2b49d [ABSTRACT FROM AUTHOR]
- Subjects :
- *ANIMAL exoskeletons
*SPECIES
*CLASSIFICATION
*SUTURES
*TRILOBITES
Subjects
Details
- Language :
- English
- ISSN :
- 00223360
- Volume :
- 96
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Journal of Paleontology
- Publication Type :
- Academic Journal
- Accession number :
- 160712928
- Full Text :
- https://doi.org/10.1017/jpa.2022.56