Megapogon schiaparellii Alvizu & Xavier & Rapp 2019, sp. nov.

• Main Authors: Alvizu, Adriana, Xavier, Joana R., Rapp, Hans Tore
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Calcarea; Leucosolenida; Achramorphidae; Megapogon; Megapogon schiaparellii; Antarc*; Antarctic
• Online Access: https://doi.org/10.5281/zenodo.10447949; http://treatment.plazi.org/id/513F790DFFC9FFA7E994D7CDFCD14BC6

Megapogon schiaparellii sp. nov. (Figs 12 A–F, 13A–D; Table 10) Diagnosis. Megapogon with sylleibid aquiferous system. Cortical skeleton is composed of sagittal triactines, trichoxeas and two types of diactines positioned perpendicularly. Spined microdiactines present scattered in the choanoskeleton and atrial skeleton. Type locality. Tethys Bay, Antarctic. Synonym and citations. M. raripilus , Alvizu et al. 2018, p. 282; M. raripilus , Ghiglione et al. 2018, p. 149. Material examined. Holotype: MNA-08193 (complete specimen), PNRA XVII Exp 01/02, Grab 18, 11.01.2002, Northwest Basin, 530 m depth (72°51’41.4”S 171°05’13.8”E), Leg. Remia Alessandro & Oliverio Marco. Paratype: MNA-07813 (complete specimen), PNRA XXVIII Expedition 12/13, Dredge 6, collection date 15.01.2013, Caletta, 146 m depth (74°45’43.5”S 64°05’46.4”E), Leg. Stefano Schiaparelli. Paratype: MNA-02762 (complete specimen), PNRA XXV Expedition 09/10, Dive 5, collection date 13.12.2009. Tethys Bay “zecca”, 23 m depth (74°41’25.0”S 164°06’09.2”E), Leg. Stefano Schiaparelli. Etymology. Named after the Dr. Stefano Schiaparelli from Italian National Antarctic Museum, in Genoa Italy, who organized the collection of the material. Morphology. Cylindrical sponge, with an apical osculum without a well-developed fringe. Surface minutely hispid due to projecting diactines and trichoxeas (Fig 12A). Aquiferous system sylleibid formed by choanocyte chambers more or less rounded (Fig 12B). The holotype size (MNA-08193) is 17.5 mm long and 9 mm wide. The paratypes size are 25.3 mm long and 5.3 mm wide (MNA-02762) and 13.1 mm long and 3.3 mm wide (MNA- 07813) is 13.1 mm long and 3.3 mm wide. Skeleton. Cortical skeleton composed of sagittal tangential triactines, trichoxeas and two types of diactines positioned perpendicularly (Figs 12 C–D). The trichoxeas are arranged in bundles which penetrate the choanosome but do not reach the atrium (Fig 12D). The choanoskeleton is inarticulated. Small and spined microdiactines are found around the choanocyte chambers and ...