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

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.

SUBMITTER: Siveter DJ

PROVIDER: S-EPMC5378094 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

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

Siveter David J DJ Briggs Derek E G DE Siveter Derek J DJ Sutton Mark D MD Legg David D

Proceedings. Biological sciences 20170301 1851

<i>Cascolus ravitis</i> 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 prob ...[more]

PMID: 28330926

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