Project 3527: D. J. Siveter, D. E. Briggs, D. J. Siveter, M. D. Sutton, D. Legg. 2017. A new crustacean from the Herefordshire (Silurian) Lagerstätte, UK, and its significance in malacostracan evolution. Proceedings of the Royal Society B: Biological Sciences. 284 (1851):20170279.
Specimen: † Cascolus ravitis (OUMNH:C.29698)
View: exoskeleton and soft parts


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.

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Article DOI: 10.1098/rspb.2017.0279

Project DOI: 10.7934/P3527,
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    Authors' Institutions

    • Imperial College London

    • University of Oxford

    • University of Leicester

    • Yale University


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