Advanced

A new silurian ophiuroid from the west of Ireland

Blake, Daniel B.; Donovan, Stephen K. and Harper, David A.T. LU (2017) In Irish Journal of Earth Sciences 35. p.57-66
Abstract

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... (More)

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).

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Irish Journal of Earth Sciences
volume
35
pages
10 pages
publisher
Royal Irish Academy
external identifiers
  • scopus:85038394413
ISSN
0790-1763
DOI
10.3318/ijes.2017.35.57
language
English
LU publication?
yes
id
ad36854f-9178-444a-bfe5-7a323273530f
date added to LUP
2018-01-04 14:50:01
date last changed
2018-01-04 14:50:01
@article{ad36854f-9178-444a-bfe5-7a323273530f,
  abstract     = {<p>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).</p>},
  author       = {Blake, Daniel B. and Donovan, Stephen K. and Harper, David A.T.},
  issn         = {0790-1763},
  language     = {eng},
  month        = {01},
  pages        = {57--66},
  publisher    = {Royal Irish Academy},
  series       = {Irish Journal of Earth Sciences},
  title        = {A new silurian ophiuroid from the west of Ireland},
  url          = {http://dx.doi.org/10.3318/ijes.2017.35.57},
  volume       = {35},
  year         = {2017},
}