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Amphiophiura

Ophiuroidea - Ophiurida - Ophiuridae

Taxonomy
Amphiophiura was named by Matsumoto (1915) [Sepkoski's age data: T Ol-u R]. It is extant.

It was assigned to Ophiomastinae by Matsumoto (1915); to Ophiolepididae by Berry (1937); to Ophiurida by Sepkoski (2002); and to Ophiurinae by Spencer and Wright (1966) and Thuy and Kroh (2011).

Synonymy list
YearName and author
1915Amphiophiura Matsumoto p. 77
1937Amphiophiura Berry p. 236
1966Amphiophiura Spencer and Wright p. U95
2002Amphiophiura Sepkoski, Jr.
2011Amphiophiura Thuy and Kroh p. 787

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
RankNameAuthor
subphylumAsterozoa
classOphiuroidea
orderOphiurida()
familyOphiuridae
subfamilyOphiurinae
genusAmphiophiura

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
H. Matsumoto 1915Disk high, often convex, covered with plates and scales, among which the primaries are very prominent. Radial shields stout, joined in pairs. Arm combs and genital papills present. Oral shields oval, pyriform or trefoil. Second oral tentacle pores open more or less, or entirely, outside oral slits; large, guarded by numerous scales. Arms moderately long, gradually tapering outwards, with blunt tips. Dorsal and ventral arm plates fairly well developed; successive plates in contact with each other at least on proximal arm joints. Lateral arm plates high, with few to numerous short, peg-like arm spines. Tentacle pores large, with numerous scales.