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File:Pentremites godonii (fossil blastoid) (Indian Springs Formation, Upper Mississippian; near Sulphur, Indiana, USA) 1 (30169670056).jpg

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Pentremites godonii (Defrance, 1819) - fossil blastoid from the Mississippian of Indiana, USA.

This species is also referred to (incorrectly) as Pentremites godoni.

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 5 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.

The complete blastoid specimen shown above is associated with lace-like fenestrate bryozoans (best seen by zooming in on the matrix - click on the photo).

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

Stratigraphy: Indian Springs Formation, Upper Mississippian

Locality: unrecorded/undisclosed site near the town of Sulphur, Crawford County, far-southern Indiana, USA

More info. at:

<a href="https://en.wikipedia.org/wiki/Blastoid" rel="nofollow">en.wikipedia.org/wiki/Blastoid</a>
Date
Source Pentremites godonii (fossil blastoid) (Indian Springs Formation, Upper Mississippian; near Sulphur, Indiana, USA) 1
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/30169670056 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2019

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current17:58, 7 December 2019Thumbnail for version as of 17:58, 7 December 20193,483 × 1,619 (5.26 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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