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

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.Cascolus ravitis holotype (VAXML/STL format)Virtual specimen of OUMNH C.29698, holotype of Cascolus ravitis. Reconstructed from physical-optical tomographic dataset using SPIERS (http://www.spiers-software.org). For method see Sutton, Rahman and Garwood 2014. Techniques for Virtual Palaeontology. Wiley Blackwell, 208pp. For details of VAXML/STL format see http://palaeo-electronica.org/content/issue-2-2012-technical-articles/226-virtual-palaeontology-toolkit.Cascolus_VAXML.zipNEXUS file for analysis of CascolusNEXUS format data file associated with Proceedings B articleESI TABLE 1 Siveter et al Cascolus ravitis NEXUS.txtCharacter list for phylogenetic analysis - PDF formatCharacter list for phylogenetic analysis associated with Proceedings B publicationESI TABLE 2. Siveter et al Character list (as used in Briggs et al. 2016).pdfCharacter list for phylogenetic analysis - DOC formatCharacter list for phylogenetic analysis associated with Proceedings B publicationSiveter et al Character list as used in Briggs et al. (2016).do