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Mastigactis

Ophiuroidea - Encrinasteridae

Taxonomy
Mastigactis was named by Spencer (1930) [Sepkoski's age data: O Ashg-m D u]. It is not extant. Its type is Eugasterella aranea. It was considered monophyletic by Dean Shackleton (2005).

It was assigned to Euzonosomatidae by Spencer (1930); to Oegophiurida by Sepkoski (2002); and to Encrinasteridae by Owen (1965), Spencer and Wright (1966) and Dean Shackleton (2005).

Synonymy list
YearName and author
1930Mastigactis Spencer
1965Mastigactis Owen p. 553
1966Mastigactis Spencer and Wright p. U86
2002Mastigactis Sepkoski, Jr.
2005Mastigactis Dean Shackleton p. 81

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
RankNameAuthor
phylumEchinodermata
subphylumAsterozoa
classOphiuroidea
familyEncrinasteridae
genusMastigactis

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 2005Ambulacral boot and hell merge with gradual curve, not sharply offset.