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Synoptic Keys to the Genera of Ophiuroidea

Family Ophiocomidae Ljungman, 1867

Family Ophiocomidae Ljungman, 1867

1 (2)

Two tentacle-scales, the inner one being greatly elongated and lanceolate. Ophiopsila Forbes, 1843.

Syn.: Ophianoplus M. Sars, 1857.

*aranea Forbes, 1843. Mediterranean. Littoral.

2 (1)

Tentacle-scales, short, leaf-like.

3 (4)

Disc covered by naked skin. . . . Ophiarthrum Peters, 1851.

*elegans Pet., 1851. Indo-W.-Pacific. Littoral.

4 (3)

Disc bearing spines, or granules.

5 (10)

Disc bearing granules only.

6 (7)

Supplementary scales at base of uppermost arm-spine. . . . Ophiopteris E. A. Smith, 1877.

*antipodum E. A. S., 1877. New Zealand. Littoral.

7 (6)

No supplementary scales.

8 (9)

Arm-spines hollow. . . . Ophiocomina Koehler, 1920.

*Asterias nigra Abildgaard, 1789. N. Atlantic. Littoral.

9 (8)

Arm-spines solid. . . . Ophiocoma Agassiz, 1836.

*Ophiura echinata Lmk., 1816. West Indies. Littoral.

10 (5)

Disc bearing spines, or spines and granules.

11 (12)

Five arms. . . . Ophiomastix Mueller & Troschel, 1842.

Syn.: Acantharachna E. A. Smith.

*Ophiura annulosa Lmk., 1816. Indonesia. Littoral.

12 (11)

Six or 7 arms. . . . Ophiocomella A. H. Clark, 1939.

H. L. Clark (1946) regards this genus as wholly made up of juvenile stages of Ophiocoma which are supposedly 5 or 7 armed as young, 5 armed as adult This has not been proved.

*caribbaea A. H. Clark, 1939. Caribbean. Littoral.