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Stenaster

Ophiuroidea -

Taxonomy
Stenaster was named by Billings (1858) [Sepkoski's age data: O Cara-l O Ashg-m Sepkoski's reference number: 1066]. It is the type genus of Stenasteridae. It was considered monophyletic by Dean Shackleton (2005).

It was reranked as Urasterella (Stenaster) by Hall (1868).

It was assigned to Urasterella by Hall (1868); to Stenurida by Sepkoski (2002); to Stenasteridae by Schuchert (1914), Schuchert (1915), Spencer (1927), Spencer (1951), Owen (1965), Spencer and Wright (1966) and Dean Shackleton (2005); and to Ophiuroidea by Blake (2013).

Synonyms
Synonymy list
YearName and author
1858Stenaster Billings p. 77
1868Urasterella (Stenaster) Hall
1880Tetraster Nicholson and Etheridge, Jr.
1914Stenaster Schuchert
1915Stenaster Schuchert pp. 163-165
1915Tetraster Schuchert pp. 167-169 figs. pl. 33 fig. 4
1927Stenaster Spencer pp. 344-356
1951Stenaster Spencer p. 111
1965Stenaster Owen p. 545
1966Stenaster Spencer and Wright p. U82
2002Stenaster Sepkoski, Jr.
2005Stenaster Dean Shackleton p. 80
2013Stenaster Blake p. 369

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
RankNameAuthor
phylumEchinodermata
subphylumAsterozoa
classOphiuroidea
genusStenaster

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
J. Dean Shackleton 2005Ambulacrals in direct opposition; ambulacrals rectangular in shape; straight perradial suture; longitudinally oriented lateral groove running down interradial surface of arm; distinct large rounded tubercles on aboral surface of adambulacrals; loss of disc granulation; aboral plates of identical size and morphology.