Suberites lutkenii Morozov, Strelkova, Zimina & Sabirov, 2023, s. str.

• Main Authors: Morozov, Grigori, Strelkova, Natalya Anisimova, Zimina, Olga, Sabirov, Rushan
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Suberitida; Suberitidae; Suberites; Suberites lutkenii; Arctic; Kara Sea; laptev; Laptev Sea
• Online Access: https://doi.org/10.5281/zenodo.10012506; http://treatment.plazi.org/id/03D17677FFCA1940B78FFB70F6A12DB1

Suberites lutkenii s. str. from the High Arctic Seas (Fig. 1a–i 1) Material analyzed. Kara Sea, MMBI trawl survey 2016, st. C6-P35 (73.08N, 67.6E), depth 35 m (1 specimen; KFU-LH-2/003). Laptev Sea, MMBI trawl survey 2014, st. O-12 (75.3383N, 122.7867E), depth 45 m (1 specimen; KFU-LH-2/004); st. L-19 (75.1983N, 128.4633E), depth 45 m (2 specimens; KFU-LH-2/005). Description . Sponge subspherical, fig-shaped, slightly flattened (Fig. 1h–i 1). Surface wrinkled, corrugated, velvety. Broad main body gradually narrows towards the short, weak pedicle, which closely embraces a substrate, usually the dead shell of a mollusc, polychaete tube or a stone. A single slit-like or roundish osculum on the sponge’s apex is surrounded by the short spicular collar. Colour (in alcohol) ash grey or pale pink. Spicules . Megascleres (choanosomal vs. ectosomal) are clearly distinguishable into two distinct categories, viz . choanosomal subtylostyles and ectosomal tylostyles (Fig. 1a–b 1). Large subtylostyles with only barely visible basal swelling, straight or slightly curved, rather short-pointed: 255.9–402±60–536 × 6.5–7.7±0.7–9 (n = 70) µm. Small tylostyles, slightly fusiform, short-pointed (rarely blunt): 173–296±54–421 × 6.5–7.6±0.6–8.5 (n = 50) µm. Microscleres are centrotylote microrhabds ranging in shape from microstrongyles to microstyles and microxeas (Fig. 1c–f). Sometimes tyle is slightly or completely shifted towards one end of spicule. In some individuals (e.g., from the Kara Sea) both smooth and microspined microscleres may occur. Dimensions: microstrongyles, 10–19±4.2–30.5 (n = 50) µm; microxeas, 30–43.5±7.2–67 (n = 40) µm; microstyles, often rare, 18.2–28±4.7–33.9 (n = 10) µm. Skeleton. Choanosomal skeleton is a loose mesh of vague spicule tracts and a confused mass of single spicules (Fig. 1 ch). In the ectosome tylostyles are organized into radial bundles (Fig. 1 sb). Microrhabds are especially found near the surface, among the ends of ectosomal tylostyles (Fig. 1 sm). Remarks. Suberites lutkenii s. str. is quite ...