Dorometra parvicirra ( Carpenter, 1888 )

Obuchi, Masami, 2020, Shallow-water Comatulids (Echinodermata: Crinoidea: Comatulida) of the Ashizuri-Uwakai Sea, Shikoku Island, Southern Japan, Species Diversity 25, pp. 309-328 : 322

28. Dorometra parvicirra ( Carpenter, 1888) [Japanese name: Yukari-umishida]

Morphology. Centrodorsal hemispherical, 3.6 mm across; polar area 0.3–0.4 times of centrodorsal diameter. Cirri delicate, LII, up to 16 segments, 14 mm long, arranged in three rows; distal end of segments flared, overlapping base of following; c5–8 longest, L/ W 1.8; no aboral ornamentation excepting opposing spine. Radials invisible. IBr series composed of 2 ossicles between which slightly constricted; each ray separated well. Arms 10, up to 105 mm long; brachials slender in distal half arms; first arm syzygy at br 3+4; distal intersyzygial interval 3. Comparative pinnule length P 1 <P 2 <P 3>P 4 =P 5; P 3 longest and remarkably stout. Disk hemispherical, smooth, two to three times as wide as centrodorsal.

Posture. Attached on underside of boulders with arms spread.

Coloration in life. Various. Ground color dark yellow, light red, brown or black, often with white spots; arms sometimes striped with dark articulation.

Distribution. Noto Peninsula, northern Japan ( Kogo 1998) to southern Queensland, Australia and Western Australia ( Rowe and Gates 1995). Ogasawara Islands (A. H. Clark and A. M. Clark 1967).

Remarks. Genus Dorometra A. H. Clark, 1917 includes small species with enlarged P 3, and the cirri with the segments distally flared. This species is recognizable by P 2 intermediate in size between P 1 and P 3, and its body size which is large for the genus.