TY - JOUR
T1 - A new silurian ophiuroid from the west of Ireland
AU - Blake, Daniel B.
AU - Donovan, Stephen K.
AU - Harper, David A.T.
N1 - Funding Information:
Jared Thomas, Illinois Natural History Survey, kindly photographed the Crepidosoma doylei specimens. David Harper acknowledges a research fellowship from the Leverhulme Trust and support from the Wenner-Gren Foundation (Sweden). Detailed reviews by Drs F.H.C. Hotchkiss (Marine and Paleobiological Research Institute, Vineyard Haven, MA, USA) and J.A. Harper (Carnegie Museum of Natural History, Pittsburgh, PA, USA) are gratefully acknowledged. We thank John Murray for redesigning and redrafting Figure 1, and making adjustments to the other figures, together with his very careful editorial work.
Publisher Copyright:
© 2017 Royal Irish Academy.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - Silurian echinoderms from Ireland are poorly known; hitherto, only three nominal species have been described, all crinoids and all from the Telychian (Upper Llandovery, Lower Silurian) Kilbride Formation in County Galway. A new species from this formation, Crepidosoma doylei, is the first recorded Irish Silurian ophiuroid (brittle star). The new species is described from five articulated specimens; all are mouldic and none retains a counterpart. The disc and immediately adjacent arm lateral ossicles of the new species differ in shape from those of the type species in that these ossicles are comparatively flat rather than angular or ridged, and the series is marked by a well-defined channelway that appears to have extended from within the disc for the full length of the free arm. Ambital framework ossicles are smooth, and not S- or Z-shaped and ridged as in the type species. The new specimens of C. doylei were recovered from distal storm deposits that are thought to be deep-water equivalents of Benthic Assemblage Zone 5 (Clorinda Community).
AB - Silurian echinoderms from Ireland are poorly known; hitherto, only three nominal species have been described, all crinoids and all from the Telychian (Upper Llandovery, Lower Silurian) Kilbride Formation in County Galway. A new species from this formation, Crepidosoma doylei, is the first recorded Irish Silurian ophiuroid (brittle star). The new species is described from five articulated specimens; all are mouldic and none retains a counterpart. The disc and immediately adjacent arm lateral ossicles of the new species differ in shape from those of the type species in that these ossicles are comparatively flat rather than angular or ridged, and the series is marked by a well-defined channelway that appears to have extended from within the disc for the full length of the free arm. Ambital framework ossicles are smooth, and not S- or Z-shaped and ridged as in the type species. The new specimens of C. doylei were recovered from distal storm deposits that are thought to be deep-water equivalents of Benthic Assemblage Zone 5 (Clorinda Community).
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U2 - 10.3318/ijes.2017.35.57
DO - 10.3318/ijes.2017.35.57
M3 - Article
AN - SCOPUS:85038394413
SN - 0790-1763
VL - 35
SP - 57
EP - 66
JO - Irish Journal of Earth Sciences
JF - Irish Journal of Earth Sciences
ER -