Cribrinopsis sp. 1

Cribrinopsis sp. 1

Fig. 2H View Fig .

MATERIAL. LV-82-7, 55.3689ºN 167.2659ºE – 55.3732ºN 167.2656ºE, depth 984– 815 m, one specimen collected (sample 1) and four specimens photographed; LV-82-8, 55.3765ºN 167.2639ºE, depth 670 m, one specimen photographed. LV-82-11, 60. 8544ºN 174.3484ºE, depth 553 m, one specimen photographed; LV-82-13, 60.8322ºN 174.3754ºE – 60.8336ºN 174.3734ºE, depth 677– 609 m, two specimens photographed; LV-82-15, 61.1399ºN 174. 9333ºE – 61.1523ºN 174.9126ºE, depth 535– 489 m, one specimen collected (sample 6) and five specimens photographed; LV-82-18, 61.1193ºN 174. 9692ºE – 61.1195ºN 174.9650ºE, depth 677– 658 m, one specimen collected (sample 3) and three specimens photographed; LV-82-21, 60.8305ºN 174. 3770ºE – 60.8343ºN 174.3720ºE, depth 672– 660 m, one specimen photographed.

REMARKS. 20 specimens are photographically documented (six of them on the Piip Volcano and 14 on the Koryak slope) at depths of 489–984 m, three of which were collected. All specimens were solitary, at a large distance from each other, not in groups. Most specimens are decamerous, with up to 80 tentacles arranged in four cycles (10+10+ 20+40=80). Only one specimen was octomerous with the tentacles distributed as 8+8+16(?)+ 32(?)=64(?) (only 58 of which are visible in the photo; possibly this is young specimen which yet not acquired decamerous arrangement, see Sanamyan et al., 2019 for discussion of the details of acquiring a decamerous arrangement). All specimens have a plain bright-rose color. The upper part of the column projects above the surface of the soft bottom, the margin with the spherules bent in the horizontal direction, the number of marginal spherules (one in each endo- and exocoel) corresponds to the number of tentacles. The actinopharynx is bright rose-red. Thin red lines mark insertions of the mesenteries on the oral disc, sometimes thin white radial lines are visible near the bases of the tentacles. The tentacles are long (inner ones as long as the diameter of the oral disc), sharply pointed, with moiré. The diameter of the expanded tentacular crown is up to 20 cm, the diameter of the column is up to 10 cm. Many red shrimps are present around. The species was found on the southern slope of the Piip Volcano at depths of 670–984 m, and on the Koryak slope at depths of 489– 677 m. The species was also present near bacterial spots and near the cold seeps with the symbiotrophic bivalve Calyptogena pacifica Dall, 1891 (see Krylova et al., 2018).