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Synoptic Keys to the Genera of Ophiuroidea

Family Asteroschematidae Verrill, 1899 — (Restr. Mortensen, 1933)

Family Asteroschematidae Verrill, 1899
(Restr. Mortensen, 1933)

1 (2)

Radial shields small, naked, glassy, without spines: disc and arms plated or granulated, arm-spines very small and irregular: proximal part of arm usually dilated, contracting abruptly at the disc. . . . Astrocharis Koehler, 1904.

*virgo Koehler, 1904. Indonesia. 300 fms.

2 (1)

Radial shields covered by skin or granules: proximal part of arm not dilated.

3 (8)

Ventral arm-plate separating lateral plates.

4 (5)

Arms short, 2–5 times disc-diameter (possibly juvenile stages of other genera). . . . Ophiuropsis Studer, 1884.

*lymani Studer, 1884. S. W. Africa. 60 fms.

5 (4)

Arms long, many times disc-diameter.

6 (7)

Large buccal shield. . . . Astrobrachion Doederlein, 1927 (as restricted by Mrtsn. 1933a).

*Ophiocreas constrictus Farquhar, 1900. New Zealand. Littoral in fiords and archibenthic.

7 (6)

No buccal shield. . . . Astroscolex Mortensen, 1933a.

*Ophiocreas adhaerens Studer, 1884. Australia. 50 fms.

8 (3)

Lateral arm-plates fused together on the ventral midline, not separated by ventral plate.

page 12
9 (10)

Disc covered by granulated skin. . . . Asteroschema Oersted & Lütken, 1856.

Syn.: Laspalia Ljungman.

*Asterias oligactes Pallas, 1788. Caribbean. 100 fms.

10 (9)

Disc covered by naked skin. . . . Ophiocreas Lyman, 1879.

*lumbricus Lyman, 1879. Caribbean. 100 fms.