Pentremites sp. (fossil blastoid) (Ramey Creek Member, Slade Formation, Upper Mississippian; Bighill Mountain roadcut, south of Bighill, Kentucky, USA) 1

Pentremites sp. - fossil blastoid head in the Mississippian of Kentucky, USA.

Blastoids are an extinct group of echinoderms. They resemble crinoids in having a head, or theca, perched atop a long stem of stacked columnals composed of calcite. Crinoids and blastoids are pelmatozoans - stalked echinoderms. Both groups are sessile, benthic, filter-feeding organisms. The overall structure and morphology of crinoid heads and blastoid heads are quite different. Blastoid heads have pentaradial symmetry and somewhat resemble closed flower buds or nuts. They have five ambulacral grooves extending outward and downward from the summit of the theca. During life, many thin, delicate brachioles extended from the ambulacral grooves - these structures captured tiny particles of food from seawater as the blastoid engaged in filter feeding.

Classification: Animalia, Echinodermata, Blastozoa, Blastoidea, Spiraculata, Pentremitidae

Stratigraphy: Ramey Creek Member, Slade Formation, Chesterian Series, Upper Mississippian

Locality: Bighill Mountain Outcrop - Route 421 roadcut through Bighill Mountain, ~county line between Rockcastle County and Madison County, south of the town of Bighill, east-central Kentucky, USA (vicinity of 37° 31’ 24.89” North latitude, 84° 12’ 28.15” West longitude)
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More info. at:
en.wikipedia.org/wiki/Blastoid

Some rights reserved

Taken on: March 12, 2018

Tags:

Pentremites

fossil

blastoid

blastoids

head

heads

Big

Hill

Bighill

Kentucky

Formation

Creek

Member

Chesterian

Mississippian

Ramey

Slade « less

Sets appears in: • Kentucky Rocks & Fossils • Slade Formation (Upper Mississippian; Kentucky, USA) more » • Mississippian Rocks & Fossils • Blastoid Fossils « less

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