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- Title
Reassessment of '<E1>Cladodus</E1>'<E1>neilsoni</E1>Traquair: a primitive shark from the Lower Carboniferous of East Kilbridge, Scotland.
- Authors
Sequeira, S. E. K.; Sequiera, S.E.K.; Coates, M. I.; Coates, M.I.
- Abstract
The partly articulated specimen of the Palaeozoic (Early Carboniferous) chondrichthyan '<E1>Cladodus</E1>'<E1>neilsoni</E1>Traquair from East Kilbride has been known since the late nineteenth century. As such, '<E1>C.</E1>'<E1>neilsoni</E1>Traquair has been cited in numerous publications, but it has become increasingly clear that its anatomy and systematic affinities are obscure. This comprehensive redescription of '<E1>C.</E1>'<E1>neilsoni</E1>reveals new details of the neurocranium (including presence of an otico-occipital fissure), dentition, visceral arches (clarifying the condition of the basibranchial pattern plus elongate copula), and pectoral fin. These data refute previously suggested synonymies, such as between '<E1>C</E1>'<E1>neilsoni</E1>and the contemporaneous Bearsden<E1>Stethacanthus</E1>. Attribution of '<E1>C.</E1>'<E1>neilsoni</E1>to the taxonomically unsupportable genus '<E1>Cladodus</E1>' is rejected, and the species is redesignated as<E1>Gutturensis</E1><E1>neilsoni</E1>gen. nov. Preliminary cladistic analysis places<E1>Gutturensis</E1><E1>neilsoni</E1>within a polytomy including<E1>Stethacanthus</E1>, the symmoriid<E1>Cobelodus</E1>, and the root of a monophyletic group of neoselachian-like genera. ' Cladodont' as a diagnostic term for early chondrichthyan teeth is found to be insufficiently precise, referring to an ill-defined grade of tooth morphologies present in a wide variety of Palaeozoic genera.
- Subjects
SCOTLAND; EAST Kilbride (Scotland); SHARKS; CHONDRICHTHYES; CARBONIFEROUS stratigraphic geology
- Publication
Palaeontology, 2000, Vol 43, Issue 1, p153
- ISSN
0031-0239
- Publication type
Article
- DOI
10.1111/1475-4983.00122