Caulophacus (Caulophacus) adakensis Reiswig & Stone 2013, n. sp.

• Main Authors: Reiswig, Henry M., Stone, Robert P.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Hexactinellida; Lyssacinosida; Rossellidae; Caulophacus; Caulophacus adakensis; Alaska; Aleutian Islands
• Online Access: https://doi.org/10.5281/zenodo.5261628; http://treatment.plazi.org/id/03D287B2FF9E36039AD7FE082D27FD7F

Caulophacus (Caulophacus) adakensis n. sp. (Figs. 19 & 20, Table 10) Synonymy. Caulophacus (Caulophacus) sp. nov. Stone et al., 2011: 35. Material examined. Holotype: USNM# 1196557, ROV ' Jason II' from RV ' Roger Revelle', dive J2100, 01 August 2004, Adak Canyon, 13 km SE of Cape Yakak, Adak Island, Aleutian Islands, Alaska, 51º31.531'N, 177º05.417'W, 1806 m, dry & ethanol. Other material. C. (C.) aff. adakensis, USNM # 1196558, ROV 'Jason II' from RV ' Roger Revelle', dive J2096, 28 Jul 2004, North Aleutian Slope, 32.8 km N of Atka Island, Aleutian Islands, Alaska, 52º23.570'N, 174º53.077'W, 2180 m, long dead, dry. Description. The truly magnificent holotype (Figs. 19A, B), an extremely large mushroom-shaped body borne on a long rigid stalk, was collected intact but the stalk was intentionally broken for storage and shipping. Total length of the dried specimen, with body canted unnaturally on stem during drying, is 90.3 cm; in natural state the length was 75 cm. The body disc (dry) is 31 x 40 cm in diameter and up to 38.5 mm in thickness. Both lower (= inhalant or dermal) (Fig. 19C) and upper (= exhalant or atrial) (Fig. 19D) surfaces are smooth, lacking prostalia, with loose spicule lattices covering the subsurface canal entrances, 3–5 mm in diameter in the lower surface and 5–8 mm in diameter in the upper surface, easily visible through the covers. A horizontally extensive subsurface space underlies the covering lattice in the inhalant area, but this is lacking in the exhalant area; there the exhalant canals run directly to the covering lattice without an intervening subsurface cavity. The 68 cm long stalk tapers from its insertion on the lower body surface to a diameter of 2.1 cm at midpoint and 1.8 cm at its minimum just above the large foliate attachment disc. It is hollow with three longitudinal canals evident at the point of section (Fig. 19E) but a single 7 mm diameter canal in the lower stalk. The margin at the junction of inhalant and exhalant surfaces is sharp and lacking obvious large ...