Lophocalyx topsenti Janussen & Reiswig, 2009, n. sp.

• Main Authors: Janussen, Dorte, Reiswig, Henry M.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Hexactinellida; Lyssacinosida; Rossellidae; Lophocalyx; Lophocalyx topsenti; Antarc*; Antarctic; Antarctica; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.5611964; http://treatment.plazi.org/id/434A87A6FFBBFFDFFF53FF14FE5389EA

Lophocalyx topsenti n. sp. (Figs. 6 & 7, Table 3) Material examined: Lophocalyx topsenti n. sp. , Holotype, SMF 10606, ANDEEP III Exped., R.V. 'Polarstern', stn PS67/142-6, Weddell Sea, Antarctica, 18 Mar. 2005, 62°09.93'S, 49°30.47'W to 62°09.80'S, 49°30.59'W, 3403–3404 m, ethanol. Paratype: RSM 1921.143.1389, Scottish National Antarctic Exped., R.V. 'Scotia', stn 313, Weddell Sea, Antarctica, 18 Mar. 1903, 62°10'S, 41°20'W, 3247 m, ethanol (reported as Calycosoma validum by Topsent, 1910, 1913). Comparative material: Calycosoma validum : holotype, USNM 0 4761, U.S. F.C.S. 'Albatross', stn 2573, George's Bank, SE of Massachusetts, USA, 0 2 Sep. 1885, 40º34'18"N, 66º09'W, 3186 m, ethanol. Description: The holotype of the new species, when inspected in June 2006 before partial dissection, was a small, intact, tubular sponge 31 mm tall and 20 mm in diameter, with a terminal osculum 9 mm in diameter, without marginalia, with wall thickness of 2 mm (Fig. 6 A). Several prostal diactins project obliquely upwards up to 9 mm from the body surface but hypodermal spicules are not raised to form a veil; groups of broken basalia project from irregular lobes of the lower body surface. The lateral surface is generally smooth to the naked eye, but, when magnified, is irregular with low conules; entrances to inhalant canals are evident through the surface lattice. The sponge is soft and pliable; color is olive brown, the same as the bottom “green-mud” substrate. The paratype, when surveyed February – May 1996, consisted of 17 wet fragments, 0.5–3 mm in thickness, the remnants of the original six fragments reported by Topsent (1913), as probably stemming from a single large cup-shaped specimen (Fig. 6 B). Both surfaces of most fragments retain the fine spicule lattice spanning over the apertures of inhalant and exhalant canals as outlined by the choanosomal diactin bundles. Intact and broken diactins projected from one surface of most fragments, but hypodermalia were not found above the lattices of free spicules. All ...