Synoptic Keys to the Genera of Ophiuroidea
Subfamily Ophiolepidinae Matsumoto, 1915
Subfamily Ophiolepidinae Matsumoto, 1915
Tentacle-pores well developed throughout arm.
Disc thin and flat covered by scales and large radial shields, and bordered by a row of marginal plates which are erect and movable, being attached only by their proximal margins. . . . Ophiophyllum Lyman, 1878.
*petilum Lyman, 1878. Kermadec Is., N.Z. 600 fms.
Disc and sides of arms covered by fine scales, which are swollen and resemble coarse granules: radial shields inconspicuous or hidden: upper arm-plates separated more or less widely by intervening small platelets: lowermost arm-spine sometimes serving as a tentacle-scale. . . . Ophiopenia H. L. Clark, 1911.
*disacantha H. L. C., 1911. Bering Sea. 50 fms.
Tentacle-scales well-developed throughout the arm.
Dorsal arm-plates entire, not fragmented nor divided into supplementary plates.
A row of papillae skirting the outer borders of the gential scales and radial shields: a pair of plates wedged between the radial shields: arm-spines minute. . . . Ophiothyreus Ljungman, 1872.
*goesi Ljung., 1872. Cuba. 200 fms.
No papillae skirting genital scales or radial shields.page 33
Adoral shields entirely separated by the oral shield, not meeting within, 1 tentacle scale.
Primary plates and radial shields large and conspicuous and, together with a radial series of plates, covering the entire disc; no granulation. . . . Ophioceramis Lyman, 1865.
*Ophiolepis januarii Lütk., 1856. Caribbean. Littoral.
Primary plates inconspicuous; radial shields the only large plates on dorsal side of disc, all other plates reduced to small scales, with fine granulation between them. . . . Ophiocrates Koehler, 1904.
*lenta Koehler, 1904. Indonesia. 1,100 fms.
Adoral shields meeting on midline proximad to oral shield, 1 or 2 tentacle scales.
First lateral arm-plate conspicuously enlarged: 1 tentacle-scale: radial shields conspicuous, triangular, tumid, at the arm bases. . . . Ophiomidas Koehler, 1904.
*alatus Koehler, 1904. Indonesia. 700 fms.
First lateral arm-plate not enlarged.
Marginal plates of disc greatly swollen, forming a rampart about the periphery: 2 tentacle scales. . . . Ophioteichus H. L. Clark, 1938.
*parvispinum H. L. C., 1938. Tasman Sea (Lord Howe Is.). Littoral.
Marginal plates not swollen.
Oral shield divided transversely into 1 proximal plate and 1 distal plate. Aboral side of disc covered by regularly arranged plates which carry tubercles. About 4 short, thick arm-spines. Oral papillae distinct, conspicuous. . . . Ophiocypris Koehler, 1931.
*tuberculosus Koehler, 1931. Kei Is., 150 fms.
Disc covered with numerous small plates and scales, the larger ones surrounded by the smaller: radial shields small, widely separated by intervening plates and scales: three conspicuous plates lie between, and distal to, the shields: 4 or 5 short arm-spines: 2 tentacle-scales: dorsal and ventral arm-plates broadly contiguous throughout. . . . Ophiozona Lyman, 1865 (restr. Matsumoto, 1915).
*Ophiolepis impressa Lütk., 1859. Caribbean. 50–200 fms.
Disc covered by a limited number of stout plates, including radial shields, and some smaller plates: 2 to 4 short arm-spines: dorsal and ventral arm-plates contiguous only at arm-base becoming progressively distant on the distal parts of arms.
Primary plates very conspicuous, covering the central half of disc: radial shields small, separated by three plates between and distal to them: 1 tentacle scale. . . . Ophiozonoida H. L. Clark, 1915.
*picta H. L. C., 1915. New Zealand. Littoral. 50 fms.
Ophiotylos Murakami, 1943, appears to fall very close to Ophiozonoida, differing mainly in having rudimentary arm-spines whereas there are 3 short arm-spines in Ophiozonoida picta. The type of Ophiotylos is O. leucus Murakami, 1943, Caroline Island.
Primary plates either conspicuous or not so, but not large: radial shields large, either contiguous, or separated by only a single narrow row of plates, not by 3 distal intervening plates: 1 or 2 tentacle scales. . . . Ophiozonella Matsumoto, 1915.
*Ophiozona longispina H. L. C., 1908. Japan. 50–300 fms.page 34
Dorsal arm-plates more or less sub-divided into supplementary plates or mosaic platelets.
Dorsal arm-plates quite distinct, but accompanied by a few supplementary plates.
Disc covered by irregular plates, not distinctly imbricating; usually small granules at or near the margins of the plates: radial shields small but distinct: primaries not distinct: one dorsal supplementary plate on each arm-joint, or on some arm-joints only. . . . Ophiolebella Mortensen. 1936.
*Ophiolebes biscutifer E. A. Smith, 1879. Antarctic. 100 fms. The type-species was overlooked in H. L. Clark's (1915) Catalogue.
Disc covered by scales in two sizes, the larger surrounded by the smaller: radial shields conspicuous: 2 tentacle scales: smaller supplementary dorsal plates on either side of and/or distal to, the dorsal plates. . . . Ophiolepis Mueller & Troschel, 1840.
*superba H. L. C., Indo-W. Pacific. Littoral.
See H. L. Clark (1915), p. 342, for discussion on name of type-species.
Dorsal arm-plates profoundly modified by extensive fragmentation and intercalation of small mosaic platelets: radial shields very small and in-conspicuous.
Three or four tentacle-scales: dorsal arm-plates subdivided into two widely separated lateral halves, between which lies a mosaic of small platelets. Ophioplocus Lyman, 1861.
*Ophiolepis imbricata M. & T., 1842. Indo-W. Pacific. Littoral.
One tentacle-scale: dorsal arm-plates subdivided into two lateral halves which are more or less widely separated at the base of the arm by a mosaic; but distally they lie close together, and one or two median plates intervene, or alternate, with them. Genital clefts not extending beyond the first arm-joint. . . . Ophioceres Koehler, 1922.
*incipiens Koehler, 1922. Antarctic. 0–100 fms.
A single well-developed tentacle-scale on the basal 3 or 4 joints, but beyond this the tentacle-pores have no scale. Disc covered by a few large plates and scales: radial shields large, contiguous. . . . Amphipholizona H. L. Clark, 1915.
*delicata H. L. C, 1915. Caribbean. 100 fms.
Tentacle-pores restricted to a few joints at the base of the arm.
Entire animal covered by thick smooth skin, more or less obscuring the plates: beneath the skin (and visible on its inner surface) are oval radial shields and other plates: dorsal arm-plates fragmented, comprising only thin, irregular fragments. . . . Ophiolipus Lyman, 1878.
*agassizii Lyman, 1878. Caribbean. 100 fms.
Disc and arm-plates distinct, not obscured by skin: disc covered by porcellanous regular plates and radial shields: dorsal and ventral arm-plates minute, and not developed in the outer part of arm: lateral arm-plates meeting in dorsal and ventral midlines.
A continuous ridge of fused oral papillae round jaw-edge: two to five tentacle-pores. . . . Ophiomusium (s.s.) Lyman, 1869.
Ophiomusa *ultima Hertz West Africa, Hertz 1927, established for spp. with only 2 pairs of tentacle-pores, is here regarded as falling within the definition of Ophiomusium.
*eburneum Lyman, 1869. Caribbean. 200 fms.
Oral papillae distinct. . . . Ophiosphalma H. L. Clark, 1941.
*Ophiomusium planum Lyman, 1878. Caribbean. 1,000 fms.