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New Thylacocephala (Crustacea) assemblage from the Spathian (Lower Triassic) of Majiashan (Chaohu, Anhui Province, South China)

Published online by Cambridge University Press:  03 December 2020

Cheng Ji*
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing210008, China
Andrea Tintori
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Mangiagalli 34, Milano20133, Italy Current address: TRIASSICA, Institute for Triassic Lagerstäetten, Via al Verde, Perledo (LC) 23828, Italy
Dayong Jiang
Affiliation:
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education; Department of Geology and Geological Museum, Peking University, Beijing100871, China
Ryosuke Motani
Affiliation:
Department of Geology, University of California, Davis 95616, California, USA
Federico Confortini
Affiliation:
Museo di Scienze Naturali ‘E. Caffi,’ Piazza della Cittadella, 10, Bergamo24129, Italy
*
*Corresponding author.

Abstract

Here we report and describe a new assemblage of Thylacocephala (Crustacea) from the late Spathian (Early Triassic) of Chaohu, Anhui Province, South China. The assemblage consists of at least three species from different genera: the small-sized Microcaris rectilineatus n. sp. appears the most abundant, while the large-sized Ankitokazocaris sp. and Diplacanthocaris chaohuensis n. gen. n. sp. are rare. A morphometric analysis of the carapace outline separates Diplacanthocaris chaohuensis n. gen. n. sp. from other genera. Along with Ankitokazocaris chaohuensis Ji et al., 2017 and Kitakamicaris sp. from the horizon 28 m above this assemblage, four different genera of Thylacocephala occur in the Chaohu Fauna. With additional materials reported from Japan and North America, the Early Triassic is now known as the period when Thylacocephala reached their highest diversity and widest geographical distribution. Thylacocephala quickly diversified shortly after the Permian–Triassic mass extinction, probably because of their ability to survive in a relatively low-oxygen environment. Thylacocephalan fossils from Chaohu are found in dense concentrations, suggesting they might have constituted a food source for the fishes and marine reptiles in the Chaohu Fauna.

UUID: http://zoobank.org/b24e82a7-ea9a-49dc-9c6c-8ad8262db276

Type
Articles
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Paleontological Society

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