Chelyosoma orientale Redikorzev, 1911, Tatarsky Strait, Sea of Japan.
OTHER COMMON NAMES None known.
Solitary species. The external appearance very characteristic: the low, wide body forms a flat disk, up to 3.9 in (10 cm) in diameter, covered by horny plates that have concentric lines of growth. Tunic is very hard, brown. Two sessile siphons on the disk, each siphon surrounded by six triangular plates. When growing on the sandy bottom, the species forms long, thick, root-shaped outgrows firmly anchoring the specimen to the substratum, but these outgrows are not present in specimens attached to stones.
Northwestern Pacific from the north part of the Sea of Japan to the Bering Strait and Chukchi Sea.
Occurs at depths from 66 to more than 984 ft (20-300 m) on stony, sandy, or muddy bottoms.
Sessile, attached, immobile species.
FEEDING ECOLOGY AND DIET Filter feeder.
Nothing is known, except that this species does not incubate larvae.
CONSERVATION STATUS Not listed by the IUCN.
SIGNIFICANCE TO HUMANS None known. ♦
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