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Balanocrinus smithi
Taxonomy
Balanocrinus smithi was named by Hess and Gale (2010). Its type specimen is BMNH EE 13708, a set of stem ossicles, and it is a 3D body fossil. Its type locality is Double Arches [Shenley Limestone], which is in an Albian marine wackestone in the Shenley Limestone Formation of the United Kingdom.
Synonymy list
| Year | Name and author |
|---|---|
| 2010 | Balanocrinus smithi Hess and Gale p. 435 figs. Figs 2, 3B–G, 4Y, AO–AQ, 5A–AF, 6A–P |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Balanocrinus smithi Hess and Gale 2010
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Hess and A. S. Gale 2010 | Columnals smooth, cylindrical or rarely
concave, mostly circular but may be rounded pentagonal or pentalobate to stellate proximally, latera smooth; diameter and height of nodals and internodals equal; nodals with five small sunken cirrus sockets surrounded by rim and directed outwards, cupules weak or lacking; cirral scar width approximately30%of nodal diameter; nodals bulging interradially; cryptosympectial distal facets of nodals and proximal facets of infranodals commonly undulating; articular facets with rather small elliptical to drop-like interradial petals which are more or less sunken, marginal crenulae strong and long so that areolae are widely separated from margin; development of radial crenulae variable, in pentalobate columnals gradually diminishing in size towards axial canal; in circular facets fused pairs near the margin commonly continue as granulose band towards centre. |