Halcampidae, Andres, 1883

Sanamyan, N. P., Sanamyan, K. E., Bocharova, E. S., Morozov, T. B. & Galkin, S. V., 2023, Sea anemones (Actiniaria, Corallimorpharia and Zoantharia) from the Western Bering Sea (Northwest Pacific), Invertebrate Zoology 20 (1), pp. 27-56 : 41

Halcampidae spp.

Fig. 4A, B .

MATERIAL. LV-75-22, 55.5123°N 167.3258ºE – 55.5040°N 167.3196ºE, depth 3583– 3493 m, three specimens photographed.

LV-82-6, 55.6972°N 167.1276ºE – 55.6966°N 167.1260ºE, depth 3949– 3948 m, five specimens photographed.

REMARKS. Two similar species of hexamerous sea anemones (about 4 cm in diameter of the tentacular crown) were photographed but not collected at the depth of about 3.5–4 km on the northern slope of the Vulcanologov Massif in 2016 (three specimens) and on the small hill west of the Komandor Graben in the Komandorsky Basin in 2018 (five specimens). In both species, the scapus is covered by a cuticle and buried in the bottom, only the upper part of the scapus and also the scapulus and oral disc with the tentacles are visible. The tentacles are arranged in three cycles: 6+6+12=24. However, in the species recorded on the northern slope, the oral disc has smaller diameter than the column, the scapulus is rather long, its length is about the same as the diameter of the column, and it has high pinkish oral cone ( Fig. 4A ). In species from the Komandorsky Basin, the oral disc is wider than the column, the scapulus is short, about 1/5 of the diameter of the column, and short uncolored oral cone ( Fig. 4B ).

Figures

Fig. 4. A — Halcampidae sp. from the northern slope of the Piip Volcano; B — Halcampidae sp. from the Komandor Graben; C — cf. Halcampoides sp.; D — Amphianthus sp. from the northern slope of the Piip Volcano; E — Amphianthus sp. from the southern slope of the Piip Volcano; F — Paracalliactis cf. involvens; G — Hormathia sp.; H — Phelliactis sp. from the northern slope of the Piip Volcano; I — Phelliactis sp. from the southern slope of the Piip Volcano; J — aff. Hormathiidae sp. 1; K — aff. Hormathiidae sp. 2; L — Sagartiogeton californicus. Рис. 4. A — Halcampidae sp. на северном склоне вулкана Пийпа; B — Halcampidae sp. в грабене Командор; C — cf. Halcampoides sp.; D — Amphianthus sp. на северном склоне вулкана Пийпа; E — Amphianthus sp. на южном склоне вулкана Пийпа; F — Paracalliactis cf. involvens; G — Hormathia sp.; H — Phelliactis sp. на северном склоне вулкана Пийпа; I — Phelliactis sp. на южном склоне вулкана Пийпа; J — aff. Hormathiidae sp. 1; K — aff. Hormathiidae sp. 2; L — Sagartiogeton californicus.