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Amphiophiura
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); to Ophiurinae by Spencer and Wright (1966) and Thuy and Kroh (2011); and to Ophiopyrgidae by O'Hara et al. (2018).
It was assigned to Ophiomastinae by Matsumoto (1915); to Ophiolepididae by Berry (1937); to Ophiurida by Sepkoski (2002); to Ophiurinae by Spencer and Wright (1966) and Thuy and Kroh (2011); and to Ophiopyrgidae by O'Hara et al. (2018).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1915 | Amphiophiura Matsumoto p. 77 |
| 1937 | Amphiophiura Berry p. 236 |
| 1966 | Amphiophiura Spencer and Wright p. U95 |
| 2002 | Amphiophiura Sepkoski |
| 2011 | Amphiophiura Thuy and Kroh p. 787 |
| 2018 | Amphiophiura O'Hara et al. p. 10 |
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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
| Reference | Diagnosis | |
|---|---|---|
| H. Matsumoto 1915 | Disk 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. |