Thalassocrinus A.H. Clark, 1911

Roux, Michel, 2015, Crinoids of the stalked family Hyocrinidae (Echinodermata) collected by the USNS Eltanin in the Southern Ocean, Zootaxa 3990 (3), pp. 381-409 : 405

publication ID	https://doi.org/ 10.11646/zootaxa.3990.3.4
publication LSID	lsid:zoobank.org:pub:08B0220E-DC57-439C-A5B7-706B2202B1A1
DOI	https://doi.org/10.5281/zenodo.6095283
persistent identifier	https://treatment.plazi.org/id/03FFAD25-FFC2-FFE1-5483-FB56A99EF99F
treatment provided by	Plazi
scientific name	Thalassocrinus A.H. Clark, 1911
status

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Genus Thalassocrinus A.H. Clark, 1911 View in CoL

Type species of the genus: Thalassocrinus pontifer A.H. Clark, 1911 .

Synonymy: A.H. Clark, 1911: 174; 1915: 160; Gislén, 1939: 13; Roux, 1980: 40–42; Mironov & Sorokina, 1998: 34; Roux, 2002: 174; Roux & Lambert, 2011: 48, 51.

Remarks. Roux & Lambert (2011) suspected Thalassocrinus to be a polyphyletic genus. They pointed out significant differences in anal sac features that suggested close affinities between (1) T. pontifer and Hyocrinus bethellianus Thomson, 1876 , (2) T. alvinae Roux, 2002 , and T. clausus Mironov & Sorokina, 1998 , and (3) T. mironovi Roux, 2002 , and Laubiericrinus pentagonalis Roux, 2004 . Molecular phylogeny ( Roux et al. 2013) confirmed that T. pontifer and H. bethellianus are closely related. DNA sequences from the four other species need to be added to get a better understanding of the interrelationships between these species. The genus Thalassocrinus sensu lato is therefore provisionally maintained.