Corallimorphus cf. pilatus Fautin, White et Pearson, 2002

Corallimorphus cf. pilatus Fautin, White et Pearson, 2002 View in CoL

Fig. 5 J, K View Fig .

Corallimorphus pilatus Fautin et al., 2002: 118 View in CoL ; Eash-Loucks, Fautin, 2012: 9.

MATERIAL. AMK-22-2310, 55.3896°N 167. 2616°E – 55.385°N 167.2566°E, depth 602–750 m, dredge 1; 55.3753°N 167.2468°E – 55.3833°N 167. 265°E, depth 580–750 m, dredge 2; eight specimens collected. AMK-22-2311, submersible Mir-1, dive 6/50: 55.4166°N 167.272°E, depth 410 m, sample 3; 55.4163°N 167.2721°E, depth 409 m, sample 4; 55. 4161°N 167.2723°E, depth 396 m, sample 5; 24 specimens collected. AMK-22-2320, submersible Mir-2, dive 15/48: 55.3858°N 167.2583°E, depth 524 m, sample 2, one specimen collected.

LV-75-1, 55.4246ºN 167.2903ºE, depth 1053 m, one specimen photographed; LV-75-2, 55.4173ºN 167.2766ºE – 55.4165ºN 167.2749ºE, depth 381– 407 m, one specimen collected (sample 2) and many specimens photographed; LV-75-3, 55.4165ºN 167. 2735ºE – 55.4164ºN 167.2759ºE, depth 386–390 m, many specimens photographed; LV-75-4, 55.4165ºN 167.2749ºE – 55.4167ºN 167.2759ºE, depth 390– 399 m, many specimens photographed; LV-75-5, 55.4166ºN 167.2749ºE – 55.4166ºN 167.2755ºE, depth 372–394 m, one specimen collected (sample 2) and many specimens photographed; LV-75-6, 55. 4166ºN 167.2743ºE – 55.4165ºN 167.2762ºE, depth 372–396 m, many specimens photographed; LV-75-7, 55.4174ºN 167.2747ºE – 55.4166ºN 167. 2752ºE, depth 421– 409 m, many specimens photographed; LV-75-8, 55.4163ºN 167.2755ºE – 55. 4161ºN 167.2749ºE, depth 407– 386 m, four specimens collected (sample 1) and many specimens photographed; LV-75-9, 55.4180ºN 167.2760ºE – 55.4161ºN 167.2742ºE, depth 424– 349 m, many specimens photographed; LV-75-10, 55.4169ºN 167. 2744ºE – 55.4172ºN 167.2748ºE, depth 407–411 m, many specimens photographed; LV-75-11, 55. 3821ºN 167.2609ºE, depth 470 m, three specimens collected (sample 1) and many specimens photographed; LV-75-12, 55.3823ºN 167.2608ºE – 55. 3810ºN 167.2611ºE, depth 468–474 m, many specimens photographed; LV-75-13, 55.3822ºN 167. 2608ºE – 55.3826ºN 167.2605ºE, depth 466–472 m, one specimen collected (sample 1) and a few specimens photographed; LV-75-14, 55.3822ºN 167. 2611ºE – 55.3820ºN 167.2607ºE, depth 460–465 m, a few specimens photographed; LV-75-15, 55. 3822ºN 167.2612ºE – 55.3821ºN 167.2612ºE, depth 466– 459 m, several specimens collected (sample 1) and many specimens photographed; LV-75-19, 55. 3822ºN 167.2625ºE – 55.3819ºN 167.2606ºE, depth 494– 453 m, a few specimens photographed; LV-75- 20, 55.3824ºN 167.2618ºE – 55.3822ºN 167.2611ºE, depth 481– 470 m, many specimens photographed; LV-75-21, 55.4812ºN 167.2572ºE, depth 2834 m, one specimen photographed; LV-75-22, 55.5100ºN 167.3240ºE – 55.5087ºN 167.3236ºE, depth 3561– 3545 m, five specimens photographed.

LV-82-1, 55.4171ºN 167.2773ºE – 55.4165ºN 167.2763ºE, depth 386– 382 m, several specimens collected (samples 3 and 7) and many specimens photographed; LV-82-2, 55.4167ºN 167.2764ºE – 55.4158ºN 167.2766ºE, depth 383–400 m, many specimens photographed; LV-82-3, 55.3827ºN 167. 2626ºE – 55.3816ºN 167.2608ºE, depth 492– 464 m, several specimens collected (samples 1, 2 and 3) and many specimens photographed; LV-82-4, 55.3817ºN 167.2612ºE – 55.3820ºN 167.2611ºE, depth 465– 451 m, many specimens photographed; LV-82-8, 55.3814ºN 167.2617ºE – 55.3825ºN 167.2617ºE, depth 469–475 m, several specimens collected (samples 2 and 7) and many specimens photographed.

REMARKS. The specimens are of moderate size, very abundant on the upper slope and top of the Piip Volcano at 372–1053 m. The white form ( Fig. 5 J View Fig ) with bright-white acrospheres at the tip of the tentacles dominates on the northern top, occurs near bacterial mats. The brown form with white acrospheres dominates at the southern top ( Fig. 5K View Fig ) and occurs directly on the seeps on bacterial mats. The species is hexamerous with up to five cycles of the marginal tentacles, 12 (two cycles) discal tentacles located in the endocoels of the first and the second cycles. Large specimens have about 12 discal and 49 marginal tentacles (the ratio is 1:4, as in C. pilatus ). The height and diameter of the preserved specimens is up to 16 mm. There are 12 pairs of perfect mesenteries and very small miscrocnemes of third and fourth cycles. Corallimorphus pilatus appear to be most closely related to the present specimens, its original description is based on numerous specimens from 198–900 m in the eastern Pacific from British Columbia to Southern California. Subsequently it was found from much greater depths (up to 2000 m) ( Eash-Loucks, Fautin, 2012). Some specimens reported here were photographed at great depth (3545– 3561 m) on the norther slope of the Piip Volcano, their morphology and external appearance are similar to those from shallower waters. Another deep-sea species (2834 m, one specimen in the photo) differs significantly from other specimens recorded on the Vulcanologov Massif in its dark bluish-brown color, body shape, high oral cone and, possibly, more numerous discal tentacles.