Callyspongia (Callyspongia) mucosa Lehnert & Stone, 2013, n. sp.

• Main Authors: Lehnert, Helmut, Stone, Robert P.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Haplosclerida; Callyspongiidae; Callyspongia; Callyspongia mucosa; Kiska; Kiska Island; Orient Point; Point Little; Little Kiska Island; Alaska; Aleutian Islands
• Online Access: https://zenodo.org/record/6163031; https://doi.org/10.5281/zenodo.6163031

Callyspongia (Callyspongia) mucosa n. sp. (Fig. 2) Material examined. Holotype: USNM# 1202116, collected by Jim Stark on 16 August 2012 at 51 ° 52.29´N, 177 ° 43.26´E, 8.8 km S of Orient Point, Little Kiska Island, eastern Aleutian Islands, Alaska, USA, at a depth of 106 m and a water temperature of 4.5 °C; paratype: USNM# 1202117, collected by Jay Orr on 4 July 2012 at 51 ° 40.75´N, 177 ° 11.26´W 4.2 km SW of Cape Chlanak, Kanaga Island, central Aleutian Islands, Alaska, USA, at a depth of 84 m and a water temperature of 4.5 °C. Description. Both specimens thickly flabellate to lobate, light brown to beige in color, with smooth, extremely slimy surfaces (Figs. 2 A & B). The consistency is soft and elastic, but rather resilient and difficult to tear. The holotype is approximately 18 cm in width, 12 cm in height, and consists of 3–4 lobes attached basally and 1.5–2 cm thick, and slightly tapered at the margins. The specimen has circular oscules, not so obvious, slightly raised and 2– 4 mm in diameter. The base narrows to about 4 cm where the sponge appears to have been attached to hard rock (larger than pebble). An unidentified brown demosponge grows on the base of the specimen (Fig. 2 A). The paratype is approximately 23 cm in width, 16 cm in height, and consists of 4–5 lobes similar to those of the holotype. The specimen has circular oscules, more obvious than in the holotype, slightly raised and 2–4 mm in diameter. This specimen also narrows somewhat at the base where it was attached to rock larger than pebbles. Microscopically examined sections of both specimens revealed unusually abundant diatoms and less abundant radiolarians (Fig. 2 F). The ectosome consists of a fine reticulation of secondary spongin fibres without coring spicules. These fibres have diameters of 15–25 µm and form meshes with oval pores with diameters of 45–70 x 85 – 130 µm (Fig. 2 C). There is also a coarser, polygonal mesh of primary spongin fibres, 20–35 µm in diameter with a mesh size of 300–520 µm (Fig. 2 C). In the corners of the ...