Zygometridae A. H. Clark, 1908c

Obuchi, Masami, 2020, Shallow-water Comatulids (Echinodermata: Crinoidea: Comatulida) of the Ashizuri-Uwakai Sea, Shikoku Island, Southern Japan, Species Diversity 25, pp. 309-328 : 319

Family Zygometridae A. H. Clark, 1908c 18. Catoptometra magnifica A. H. Clark, 1908d [Japanese name: Ohkobu-umishida]

Morphology. Centrodorsal hemispherical, 5.4 mm across; polar area deeply concave, about 0.4 times of centrodorsal diameter. Cirri stout, curved inward, knobby with segments centrally constricted, XLVI, up to 21 segments, 22.0 mm long, arranged in three rows; c5–8 longest, L/ W 1.4 . Radials visible at distal corners. Division series slender with ossicles as long as broad; IBr composed of 2(1+2) ossicles, and II–IIIBr of 2; each ray well separated. Arms 40, 120 mm long; brachials beyond proximal quarter of arms swollen wedge shaped, L/ W 1.0; first arm syzygy at br 3+4; distal intersyzygial intervals 6–12. Comparative pinnule length P 1 <P 2>P 3>P 4>P 5; P 1–3 enlarged; basal segments of proximal to middle pinnules with keel on side toward arm tip. Disk flat stellate, two times as wide as centrodorsal.

Posture. Fully exposed on rocky pinnacles, with arms in multilayered arrays.

Coloration in life. Uniformly red or orange; rays often banded with red and orange.

Distribution. Sagami Sea ( Kogo and Fujita 2014) to Less- er Sunda Islands. Ogasawara Islands (A. H. Clark 1941).

Remarks. Genus Catoptometra A. H. Clark, 1908 is characterized by having IBr series united by syzygy and no aboral process on cirri. This species is relatively common in the Ashizuri-Uwakai Sea, and can be recognized by the arms more than 30, and all division series composed of 2 ossicles.