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Proc Biol Sci. 2017 Mar 29;284(1851). pii: 20170279. doi: 10.1098/rspb.2017.0279.

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

Author information

1
Department of Geology, University of Leicester, Leicester LE1 7RH, UK djs@leicester.ac.uk.
2
Department of Geology and Geophysics, and Yale Peabody Museum of Natural History, Yale University, PO Box 208109, New Haven, CT 06520-8109, USA.
3
Earth Collections, University Museum of Natural History, Oxford OX1 3PW, UK.
4
Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK.
5
Department of Earth Sciences and Engineering, Imperial College London, London SW7 2BP, UK.

Abstract

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.

KEYWORDS:

Crustacea; Herefordshire Lagerstätte; Leptostraca; Malacostraca; Phyllocarida; Silurian

PMID:
28330926
PMCID:
PMC5378094
DOI:
10.1098/rspb.2017.0279
[Indexed for MEDLINE]
Free PMC Article

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