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Geocoma
Taxonomy
Geocoma was named by d'Orbigny (1850) [Sepkoski's age data: J Toar K Ceno-l]. Its type is Ophiura carinata.
It was assigned to Ophiurinae by Spencer and Wright (1966); to Ophiurida by Sepkoski (2002); and to Aplocominae by Hess and Meyer (2008).
It was assigned to Ophiurinae by Spencer and Wright (1966); to Ophiurida by Sepkoski (2002); and to Aplocominae by Hess and Meyer (2008).
Synonymy list
| Year | Name and author |
|---|---|
| 1850 | Geocoma d'Orbigny p. 381 |
| 1966 | Geocoma Spencer and Wright p. U95 |
| 2002 | Geocoma Sepkoski |
| 2008 | Geocoma Hess and Meyer pp. 30, 32, 35 |
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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.
G. †Geocoma d'Orbigny 1850
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†Geocoma canjuersensis Roman et al. 1993
†Geocoma libanotica König 1825
†Geocoma magna Bataller 1941
†Geocoma planata Quenstedt 1876
†Geocoma schoentalensis Hess and Meyer 2008
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Hess and C. A. Meyer 2008 | Adoral shields in contact; teeth weak, conical; six oral papillae, proximally two conical papillae, distally four leaf-like papillae; arms dorsally slightly keeled; lateral arm plates flat, moderately striated; 4-6 arm spines, length barely reaching that of arm segment; genital plate bar-like. |