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A new crustacean from the Herefordshire (Silurian) Lagerstätte, UK, and its significance in malacostracan evolution

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journal contribution
posted on 06.03.2019, 09:56 by David J. Siveter, Derek E. G. Briggs, Derek J. Siveter, Mark D. Sutton, David Legg
Cascolus ravitis gen. et sp. nov. is a three-dimensionally preserved fossil crustacean with soft parts from the Herefordshire (Silurian) Lagerstätte, UK. It is characterized by a head with a head shield and five limb pairs, and a thorax (pereon) with nine appendage-bearing segments followed by an apodous abdomen (pleon). All the appendages except the first are biramous and have a gnathobase. The post-mandibular appendages are similar one to another, and bear petal-shaped epipods that probably functioned as a part of the respiratory–circulatory system. Cladistic analysis resolves the new taxon as a stem-group leptostracan (Malacostraca). This well-preserved arthropod provides novel insights into the evolution of appendage morphology, tagmosis and the possible respiratory–circulatory physiology of a basal malacostracan.

Funding

We thank the Natural Environment Research Council (Grant NE/F018037/1), the Leverhulme Trust (grant no. EM-2014-068), Oxford University Museum of Natural History, the Yale Peabody Museum of Natural History Invertebrate Paleontology Division and English Nature for support.

History

Citation

Proceedings of the Royal Society B: Biological Sciences, 2017, 284 (1851), pp. 20170279-20170279

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/School of Geography, Geology and the Environment/Dept of Geology Pre Nov 17

Version

VoR (Version of Record)

Published in

Proceedings of the Royal Society B: Biological Sciences

Publisher

Royal Society, The

issn

0962-8452

eissn

1471-2954

Acceptance date

07/03/2017

Copyright date

2017

Available date

06/03/2019

Publisher version

https://royalsocietypublishing.org/doi/10.1098/rspb.2017.0279

Notes

Electronic supplementary material is available online at https://dx.doi.org/10.6084/m9.figshare.c.3721774.

Language

en