THE BRITISH SILURIAN CRINOIDEA

摘要

This is the first monographic study of the Silurian Crinoidea of the British Isles since 1839. About 120 species of crinoid are identified from the Silurian of the British Isles including those in open nomenclature and columnal morphotaxa. Over half are known from the Much Wenlock Limestone Formation of Dudley, Worcestershire. One new genus is erected, the Wenlock crotalocrinitid Pleuroptyx Widdison in Donovan et al., 2010, type species Apiocrinites? punctatus Hisinger. New species (Wenlock unless stated otherwise) include the calceocrinid disparid species Calceocrinus nidamentum Donovan et al., 2009, Chirocrinus broweri Donovan et al., 2009 and Chirocrinus baingowardi Donovan et al., 2010 (Llandovery); the cyathocrinitid cladid Cyathocrintes? fonei Donovan et al., 2010; the crotalocrinitid cladid Crotalocrinites enodis Widdison in Donovan et al., 2010; the dendrocrinid cladids 'Dendrocrinus' whitei Donovan et al., 2010 (Llandovery), Plicodendrocrinus brevis (Ramsbottom MS) Donovan et al., 2010 (Wenlock or Ludlow) and 'Dendrocrinus' obscurus sp. nov. (Llandovery); the periechocrinid monobathrid Periechocrinus? bulbosus (Ramsbottom MS) sp. nov.; the carpocrinid monobathrids Carpocrinus verminosus Widdison sp. nov. and Carpocrinus ramsbottomi Widdison sp. nov.; the eucalyptocrinitid monobathrids Calliocrinus rugiferus (Ramsbottom MS) sp. nov. and Eucalyptocrinites aberrans Widdison sp. nov.; the hapalocrinid monobathrid Cordylocrinus rugobrachialis (Ramsbottom MS) sp. nov.; and the columnal morphospecies Floricolumnus (col.) lefewi Donovan sp. nov. (Llandovery).