Coelosphaera (Histodermion) kigushimkada Lehnert & Stone, 2015, n. sp.

• Main Authors: Lehnert, Helmut, Stone, Robert P.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Poecilosclerida; Coelosphaeridae; Coelosphaera; Coelosphaera kigushimkada; Bering Sea; Aleutian Islands
• Online Access: https://doi.org/10.5281/zenodo.5617483; http://treatment.plazi.org/id/EF19F0298918FFF4FF28FBFFE3A89C55

Coelosphaera ( Histodermion ) kigushimkada n. sp. (Figs. 10 & 11, Table 4) Material examined. Holotype (ZSM 20150388) and paratype (ZSM 20150389), collected by Brian Knoth with a research survey bottom trawl (haul #15) from the FV Ocean Explorer 13 June 2012, 265 m depth, 11 km west of Cape Kigushimkada, Umnak Island, eastern Aleutian Islands, Bering Sea (53°07.0560' N, 168°58.4400' W). Water temperature = 3.7°C. Complete specimens in ethanol. Description. Habitus: A globular, golden-yellow sponge with a surface covered with thin, flattened fistules. Two specimens were collected, the larger (holotype) measures 6–6.4 cm in diameter and 4.8 cm in height, the smaller (paratype) with a maximum diameter of 4.4 cm attains a height of 2.3 cm (Fig. 10 A). Long fistules are 4–7 cm in length, 1.5–3 mm in diameter and are separated at distances of about 2–3 mm. Shorter fistules are recognisable in between long fistules starting from below 1 mm with intermediate lengths up to long fistules. We assume the growth of new fistules between existing ones as the surface of the sponge is spreading during growth. The largest fistules sometimes branch or might be the result of coalescing fistules. Consistency is resilient and elastic. Skeletal structure: Typical of the genus the sponge is hollow, bladder-like with a thick, parchment-like ectosomal membrane. The ectosomal skin is packed with isochelae (Fig. 10 B) and tornotes (Fig. 10 C) without orientation. The choanosome consists of an irregular reticulation of vague tracts (Fig. 10 D) and single spicules where all spicule categories of this species may occur. Spicules: Ectosomal (aniso-) tornotes are 415–622 x 8–11 µm (Figs. 11 A & B), choanosomal acanthostyles are 291–596 x 19–34 µm (Figs. 11 A & B). Microscleres are robust, arcuate isochelae, 38–46 µm (Fig. 11 C). Discussion. Assignment to the genus Coelosphaera is without doubt because this is a hollow sponge with a parchment-like skin possessing fistules. As spiculation includes acanthostyles the subgenus ...