Latrunculia (Biannulata) oparinae Samaai and Krasokhin (2002)

Samaai, Toufiek, Gibbons, Mark J. & Kelly, Michelle, 2006, Revision of the genus Latrunculia du Bocage, 1869 Porifera: Demospongiae: Latrunculiidae) with descriptions of new species from New Caledonia and the Northeastern Pacific (, Zootaxa 1127 (1), pp. 1-71 : 54-55

Latrunculia (Biannulata) oparinae Samaai and Krasokhin (2002)

( Figs 1S, 6N, 7, 8C, 9A; Tables 2 & 3)

Latrunculia oparinae Samaai and Krasokhin, 2002 , FIGS 1A–G,PP 95–101

Holotype material. ZMA POR 10780 (cross ref. Ts 439), Kurile Island, Onekotan, Russia, 49 22.1'N, 154 09.5'E, depth 28 m, collected on Cruise 7 " A.K. Oparin " stat. 66 by V. Krasokhin, 1988.

Additional (paratype) material. PIBOC O2­28 ­ 1 , Kurile Islands , Is. Urup, Russia, 45 42.5'N, 149 56.0' E, 127 m depth, 28.vii.1986, coll . V. B. Krasokhin (2 Cruise USSR RV “ Akademic Oparin ”, st.28, dredge) . PIBOC O17­126 ­ 2 , Kurile Islands , Is. Traps rocks, Russia, 48 27.8' N, 153 50.8' E, 176 m depth, 9.vii.1993, coll . V.B. Krasokhin , (17 Cruise Russian RV “ Akademic Oparin ”, st.21, dredge) . PIBOC 029­286 , Kurile Islands , Is. Simushir, Russia, 46 053.0'N, 151 050.2' E, 238m depth, 21. 07. 2003, coll . V. B. Krasokhin (29 Cruise USSR RV “ Akademic Oparin ”, dredge) .

Diagnosis. Globular sponge, ranging in size from 3 x 3 x 1.5 cm to 13 x 13 cm in diameter with raised cylindrical­shaped oscules and numerous large thin inverted mammiform areolate porefields ( Fig. 8C). Styles are terminally spined, 435 (400–464) x 16 (16) m, n=20 ( Fig. 8N). Microscleres ( Fig. 1S): anisodiscorhabds, stout and squat with the median whorl just above the manubrium. The median whorl is slightly smaller in diameter than the subsidiary whorl. Both are deeply notched along the rim and divided into four segments, each possessing denticulate margins of 2–4 spines that are themselves microspined. Anisodiscorhabd length, 40 (35–44) x 7 (7) m, n=20. The choanosomal skeleton is a firm, dense, well developed but irregular polygonal reticulation ( Fig. 9A ), with tracts ranging in width from 273–455 m in thickness. The sponge, whose habitat is sandy gravel at 127–202 m depth, has only been recorded from Kurile Island, Sea of Okhotsk, Russia ( Fig. 7 ) (from Samaai and Krasokhin 2002).

Remarks. Latrunculia oparinae is the only species in this genus that possesses terminally spined styles, making it unique among the species previously described within Latrunculia . The anisodiscorhabds are also unique in their short squat morphology.

Figures

FIGURE 7. Worldwide distributions of Latrunculia (Biannulata) species. Distributions of A) Latrunculia spinispiraefera Brøndsted, B) Latrunculia citharistae Vacelet, C) Latrunculia purpurea Carter, D) Latrunculia oparinae Samaai and Krasokhin; E) Latrunculia lunaviridis Samaai and Kelly; F) Latrunculia microacanthoxea Samaai and Kelly; G) Latrunculia kaakaariki Alvarez et al.; H) Latrunculia duckworthi Alvarez et al.; I) Latrunculia procumbens Alvarez et al.; J) Latrunculia wellingtonensis Alvarez et al., 2002; K) Latrunculia kaikoura Alvarez et al.; L) Latrunculia millerae Alvarez et al.; M). Latrunculia austini sp. nov.

FIGURE 9. Photomicrographs of choanosomal architectures: A. Latrunculia oparinae Samaai and Krasokhin 2002; B. Latrunculia lunaviridis Samaai and Kelly 2003; C. Latrunculia microacanthoxea Samaai and Kelly 2003; D. Latrunculia kaakaariki Alvarez et al. 2002;