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Shidianocrinus

Crinoidea - Diplobathrida - Dimerocrinitidae

Taxonomy
Shidianocrinus was named by Chen and Yao (1985) [Sepkoski's age data: D m]. It is not extant. It was considered monophyletic by Webster et al. (2009).

It was assigned to Diplobathrida by Sepkoski (2002); and to Dimerocrinitidae by Webster et al. (2009).

Synonymy list
YearName and author
1985Shidianocrinus Chen and Yao
2002Shidianocrinus Sepkoski, Jr.
2009Shidianocrinus Webster et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
classCrinoideaMiller 1821
RankNameAuthor
subclassCamerataWachsmuth and Springer 1885
infraclassEucamerataCole 2017
orderDiplobathrida
superfamilyDimerocrinitaceavon Zittel 1879
familyDimerocrinitidaevon Zittel 1879
genusShidianocrinusChen and Yao 1985

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.

Diagnosis
ReferenceDiagnosis
G. D. Webster et al. 2009Dorsal cup truncated medium cone shape. Infrabasals very
bulbous and bear stem impression on proximal half.
Anitaxis 1:3:4:5:6 with last row in tegmen, additional
plates to anal opening lost. Median ray ridge begins at base
of basals, dividing in center of basals with each half
merging with ridges from adjacent basals below center of
radials to form median ridge extending onto axillary second
primibrachials where it splits to extend onto the secundibrachials.
Only first secundibrachials preserved in each ray.
Secundibrachials elongate “horseshoe shape” in transverse
section with deep V-shaped ambulacral groove. Tegmen
shallowly convex, with concave interambulacral interareas
extending to elevated central orals. Posterior oral with
prominent central node and adjoined by 7 encircling plates.
Anal opening eccentric, exact position uncertain because of
loss of plates. Stem attachment facet circular, axial canal
pentalobate.