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Jiangxispira, a new gastropod genus from the early Triassic of China with remarks on the phylogeny of the Heterostropha at the Permian/Triassic boundary

Published online by Cambridge University Press:  20 May 2016

Pan Hua-Zhang
Affiliation:
Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing, People's Republic of China 210008
D. H. Erwin
Affiliation:
Department of Paleobiology, MRC-121, National Museum of Natural History, Washington, D. C. 20560
A. Nützel
Affiliation:
Paläontologisches Institut, Universität Erlangen, Loewenichstr. 28, D-91054 Erlangen, Germany
Zhu Xiang-Shui
Affiliation:
Department of Environment and Resource Science, Jiangxi Normal University, Nanchang, Republic of China 330027

Abstract

New heterostrophic gastropods are reported from the lowermost part of the Dayie Formation (Early Triassic, Leping, Jiangxi province, China). A new genus Jiangxispira (Streptacididae) is described. Jiangxispira yangouensis new genus and new species has an almost discoidal, heterostrophic protoconch that is typical of the largely Paleozoic Streptacididae, yet the teleoconch resembles that of certain Mesozoic opisthobranchs belonging to the Superfamily Cylindrobullinoidea. This character combination in Jiangxispira may indicate a phylogenetic link between the Paleozoic Streptacididae (Allogastropoda) and the Mesozoic Cylindrobullinoidea (Opisthobranchia). Small opisthobranchs form an important component of Early Triassic gastropod faunas. The opisthobranchs seemingly benefited from selective processes operating during the Permo-Triassic mass extinction and the reorganization of gastropod faunas during the subsequent recovery period.

Type
Research Article
Copyright
Copyright © The Paleontological Society

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