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GEOREF RECORD

Palaeobiology of Floricolumnus (col.) girvanensis Donovan & Clark (Crinoidea, Silurian) from the Girvan District, Ayrshire

Abstract

Fossil crinoids are only rarely described from complete skeletons, that is, from the attachment structure to the ends of the arms. The crinoid Floricolumnus (col.) girvanensis Donovan & Clark was originally described on the basis of its distinctive column only, particularly the inflated, serrated nodal columnals; the crown remains unknown. Floricolumnus (col.) is important, with nodal columnals representing potential intercontinental stratigraphic markers for the interval from the Lower-Middle Llandovery boundary to the mid-Middle Llandovery (that is, late Rhuddanian to mid-Aeronian). The discovery of the attachment structure of F. (col.) girvanensis is, therefore, significant. A long pluricolumnal is interpreted as a distal planar coiled attachment; a simple discoidal holdfast with an anastomosing sculpture may be a juvenile attachment. Erect protuberances on some nodal epifacets may be a stereomic reaction to embedding or boring epizoobionts.


ISSN: 0036-9276
EISSN: 2041-4951
Coden: SJGEAX
Serial Title: Scottish Journal of Geology
Serial Volume: 49
Serial Issue: 1
Title: Palaeobiology of Floricolumnus (col.) girvanensis Donovan & Clark (Crinoidea, Silurian) from the Girvan District, Ayrshire
Affiliation: Natural History Museum, Department of Palaeontology, London, United Kingdom
Pages: 1-7
Published: 201305
Text Language: English
Publisher: Geological Society Publishing House for the Geological Societies of Edinburgh and Glasgow, Bath, United Kingdom
References: 39
Accession Number: 2014-001922
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N55°00'00" - N55°49'60", W05°00'00" - W03°30'00"
Secondary Affiliation: Naturalis Biodiversity Center, NLD, Netherlands
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201403
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