A new crustacean from the Herefordshire (Silurian) Lagerstätte, UK, and its significance in malacostracan evolution
Siveter, D.J.; Briggs, D.E.G.; Siveter, D.J.; Sutton, M.D.; Legg, D. (2017). A new crustacean from the Herefordshire (Silurian) Lagerstätte, UK, and its significance in malacostracan evolution. Proc. - Royal Soc., Biol. Sci. 284(1851): 1-8. https://dx.doi.org/10.1098/rspb.2017.0279
In: Proceedings of the Royal Society of London. Series B. The Royal Society: London. ISSN 0962-8452; e-ISSN 1471-2954, more
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| Keywords |
Geological time > Phanerozoic > Paleozoic > Palaeozoic > Silurian
Crustacea [WoRMS]; Leptostraca [WoRMS]; Malacostraca [WoRMS]; Phyllocarida [WoRMS]
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| Author keywords |
Herefordshire Lagerstätte |
| Authors | | Top |
- Siveter, D.J.
- Briggs, D.E.G.
- Siveter, D.J.
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| 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. |
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