Thenea abyssorum Koltun 1964

• Main Authors: Cárdenas, Paco, Rapp, Hans Tore
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2012
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Astrophorida; Theneidae; Thenea; Thenea abyssorum; Greenland; Greenland Sea; Northern Norway; Vesterålen
• Online Access: https://doi.org/10.5281/zenodo.6166253; http://treatment.plazi.org/id/A61787B7DC49FF95FF33F9B4FA3FFA9F

Thenea abyssorum Koltun, 1964 (Figures 17, 18 A–B) Synonymy. Thenea muricata abyssorum Koltun, 1959 (nomen nudum): Koltun 1959, p. 662. Thenea abyssorum : Koltun 1964, p. 146; Koltun 1966, p. 37; Steenstrup & Tendal 1982, p. 259; Barthel & Tendal 1993, p. 83; Witte 1996, p. 571; Weslawski et al. 2003, p. 75; Cárdenas et al . 2011, Table S1. Thenea sp.: Babiç 1915, p. 408. Material. NTNU-VM 54948, off Vesterålen, northern Norway, 69°30.3'N, 13°55'E, 2130 m; NTNU-VM 66585, Røstbanken, northern Norway, 68°36.5'N, 11°54'E, 675- 850 m. Comparative material. Thenea abyssorum , ZMBN 85228, Arctic mid-ocean ridge, Greenland Sea, 73°34'N, 07°45'E, H2 DEEP cruise 2008, 2425– 2463 m, Sneli sled (Sneli 1998). Outer morphology (Fig. 17 A). Small sub-spherical sponge (2.5 cm high, 2 cm wide) with root-like structures. Very hispid. Slightly compressible. Color alive and in ethanol is dirty brown. Choanosome is whitish to brownish (alive and in ethanol). Pores and oscule are on opposite sides (in upper part of sponge). The pore area is covered by a sieve and protected by an overhang. There is no sieve over the single oscule (ca 1 mm in diameter), it is circular and surrounded by a fringe of long oxeas. Skeleton (Fig. 17 B–C). Radial bundles of oxeas start at the center of the specimen. Many go beyond the surface, especially on the top surface, very hispid. Triaenes are found only at the surface (Fig. 17 C), either crossing the ectosome or supporting it. Spirasters are abundant in the ectosome, but spirasters and plesiasters can be found throughout the choanosome (spirasters being much more common than plesisasters). The roots are made of bundles of oxeas and anatriaenes and they originate in the central part of the sponge. Anatriaenes are especially common in the basal part, always crossing the ectosome. Spicules (ZMBN 85228) (Figs. 17 C–F, 18A–B). (a) oxeas, straight, length>3750 µm; width: 20–40 µm. (b) dichotriaenes (Fig. 17 C-D), rarely modified to orthotriaene or plagiotriaene, straight rhabdome or slightly ...