Tetilla sibirica

• Main Authors: Morozov, Grigori, Sabirov, Rushan, Zimina, Olga
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Spirophorida; Tetillidae; Tetilla; Tetilla sibirica; Arctic; Chukchi Sea; Pacific; Yamal Peninsula; New Siberian Islands; Chukchi; laptev; Spitsbergen
• Online Access: https://doi.org/10.5281/zenodo.3664857; http://treatment.plazi.org/id/03A287D2FC78414A9BA4FDDF312F3594

Tetilla sibirica (Fristedt, 1887) (Figure 12 (a – h)) Tethya sibirica Fristedt 1887, p. 436 – 437; pl. 24, figs 22 – 28; pl. 28, fig. 17; Hentschel 1929, p. 860 – 861, 916 Tetilla sibirica : Koltun 1966, p. 61 – 63, figs 32 – 33; pl. XVII, figs 1 – 3; pl. XVIII, fig. 1 Description (Figure 12 (a – b)). Body elongated, more or less egg shaped, up to 6 cm in height and 5 cm in diameter; provided with long root-like processes, by which the sponge is anchored to the substrate. The surface is markedly hispid, often with alternating lengthwise ridges and grooves (only occasionally may specimens with quite even surfaces be found). A few oscula of roundish form often grouped at the summit. The consistency is rather firm. Colour from beige to dark brown. Ten specimens examined. Skeleton Skeleton of radially spiral structure. Cortex absent. Spicules (Figure 12 (c – h)). Large oxea, usually with unequal ends, dimensions: 1519.9 – 4125.85 – 6860 ( n = 50) × 14.25 – 39.8 – 63.6 ( n = 50) µm. Small oxea, slightly fusiform, with equal ends, dimensions: 516 – 1029 – 1471 ( n = 50) × 19.6 – 34.55 – 44.7 ( n = 50) µm. Anatriaenes, rhabdome length: 2241 – 3617.8 – 5838 ( n = 50) × 7.6 – 12.6 – 18 ( n = 50) µm; cladome length: 81.9 – 197.8 – 283.5 ( n = 50) µm. Sagittal protriaenes, rhabdome length: 701 – 1241 – 2648.4 ( n = 50) × 2.4 – 3.6 – 5.9 ( n = 50) µm; length of paired cladomes: 23 – 39.6 – 97.3 ( n = 50) µm; unpaired cladome length: 58.5 – 87.3 – 178.4 ( n = 50) µm. Normal protriaenes, rhabdome length: 1417.6 – 2868 – 4424.8 ( n = 20) × 5 – 9.2 – 13.3 ( n = 20) µm; cladome length: 45 – 86.8 – 146.2 ( n = 20) µm. Sigmas sinuous, spiny, dimensions: 14 – 20.5 – 27.3 ( n = 50) µm. Distribution The east coast of Spitsbergen. The Kara (west of Yamal Peninsula; Taimur Island, Actinia Bay) and Laptev seas (st. L-9, L-11, L-12, L-19, O-8, O-12). The New Siberian Islands (st. A- 31, A-51, A-70, A-74), Chukchi Sea. Pacific coast of the Kuril Islands. Depth range: 7 – 54 m (Arctic seas), 127 – 414 (Pacific Ocean). Remarks Fristedt, in ...