Sphaerotylus borealis Swartschewsky 1906

• Main Authors: Morozov, Grigori, Sabirov, Rushan Mirzovich, Anisimova, Natalia
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Hadromerida; Polymastiidae; Sphaerotylus; Sphaerotylus borealis; Barents Sea; Franz Josef Land; Norwegian Sea; Svalbard; Spitsbergen
• Online Access: https://doi.org/10.5281/zenodo.10530812; http://treatment.plazi.org/id/038DC908FFBFFFAAC2E0FA5FFDBFF90E

Sphaerotylus borealis Swartschewsky, 1906 (Figure 5 (a–g)) Proteleia borealis Swartschewsky 1906, p. 315, pl. X fig. 1, pl. XIII fig. 2 Spaerotylus borealis : Koltun 1966, p. 83, fig. 55, pl. XXX figs. 1–5; Plotkin 2004, p. 543, figs. 1I, 2I, 4B; Plotkin et al. 2016, pp. 14–17, figs. 10, 11 Description (Figure 5 (a)) Sponge cushion- or disc-shaped, up to 2.5 cm in diameter and 1.5 cm in height. Surface shaggy with several cylindrical or conical papillae up to 1.2 cm in length, some with oscula (about 1 mm in diameter) on the summits. Colour light brown. Skeleton The choanosomal skeleton is formed by the thick radial bundles of styles and disorderly scattered small tylostyles. Ectosomal skeleton consists of two layers: (1) palisade layer of small styles and (2) underlayer of intermediary spicules arranged tangentially. Surface hispidation caused by long styles and sphaerotyles, basal ends of which anchored in the ectosome. Spicules (Figure 5 (b–g)) Large polytylotes styles, dimensions: 583–1351–2517 ( n = 20) × 7.4–26– 38.5 µm ( n = 15); styles (tylostyles) intermediate, dimensions: 191.85–459.4–707.8 ( n = 30) × 10.5–12.75– 15.6 µm ( n = 10); small tylostyles, of two distinct categories: straight and curved (in their apices), dimensions: 110–141.4–218.8 ( n = 30) × 2.9–4.3– 6.9 µm ( n = 30); long styles and sphaerotyles (with rough heads) up to 7.7 mm in length and 44 µm thickness. Distribution Norwegian Sea, Barents Sea (south-western part, Franz Josef Land), Spitsbergen, White and Kara (Shokalsky Strait) seas. Published as part of Morozov, Grigori, Sabirov, Rushan Mirzovich & Anisimova, Natalia, 2018, New data on sponges from Svalbard Archipelago with a description of a new species of Halicnemia, pp. 491-507 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 52 (7 - 8) on pages 498-499, DOI:10.1080/00222933.2018.1440020, http://zenodo.org/record/4780290