Cranial anatomy and phylogenetic position of Suminia getmanovi, a basal anomodont (Amniota : Therapsida) from the Late Permian of Eastern Europe

Authors
Citation
N. Rybczynski, Cranial anatomy and phylogenetic position of Suminia getmanovi, a basal anomodont (Amniota : Therapsida) from the Late Permian of Eastern Europe, ZOOL J LINN, 130(3), 2000, pp. 329-373
Citations number
54
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
ISSN journal
0024-4082 → ACNP
Volume
130
Issue
3
Year of publication
2000
Pages
329 - 373
Database
ISI
SICI code
0024-4082(200011)130:3<329:CAAPPO>2.0.ZU;2-X
Abstract
Suminia gelmanovi, a recently discovered basal anomodont from the Late Perm ian of Russia, is characterized by robust, 'leaf-shaped' teeth, and a masti catory architecture that is similar to that of the highly diverse and cosmo politan group of Permo-Triassic herbivores, Dicynodontia (Anomodontia). Bas ed on new material, the skull is reconstructed in three dimensions and desc ribed in detail. A cladistic analysis of the basal anomodonts, Patranomoden , Galeops, Otsheria, Ulemica, and Suminia, using 37 cranial characters, res ulted in a single most parsimonious tree, in which Suminia is united with t he Russian taxa, Ulemica and Otsheria. This clade, diagnosed by four unambi guous characters, is designated as Venyukovioidea. The South African anomod ont, Galeops, appears as the sister taxon to Dicynodontia. Patranomoden is the most basal anomodont. The cladistic analysis suggests that a 'dicynodon t-type' masticatory architecture, with an expanded adductor musculature and sliding jaw articulation, may have originated prior to the advent of the ( Venyukovioidea + (Galeops + Dicynotiontia)) clade. (C) 2000 The Linnean Soc iety of London.