Praxillinicola kroyeri M'Intosh 1885

• Main Author: Huys, Rony
• Format: Other/Unknown Material
• Language: unknown
• Published: 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Poecilostomatoida; Clausiidae; Praxillinicola; Praxillinicola kroyeri; Antarctic; Antarctic Ocean; Antarc*
• Online Access: https://zenodo.org/record/6071948; https://doi.org/10.5281/zenodo.6071948

Praxillinicola kroyeri M’Intosh, 1885 (Figs. 7–8) Praxillinicola kröyeri M’Intosh, 1885 —incorrect original spelling (ICZN Art. 32.5.2.1). Original description. M’Intosh (1885): 409, Plate XXXIX A, fig. 10. Host. Praxillella abyssorum (M’Intosh, 1885) [as Praxilla abyssorum M’Intosh, 1885] (family Maldanidae). Type locality. Attached to incomplete specimen of P. abyssorum trawled at H.M.S. Challenger station 157 (Antarctic Ocean); 53º55’ S, 108º35’ E; depth 1,950 fathoms (3,566 m); diatom ooze. Material examined. Holotype ♀ (NHMUK reg. no. 85.12.1.305A); attached to the fifteenth segment of the holotype of P. abyssorum (NHMUK reg. no. 85.12.1.305) by “… two small processes on the under surface of the snout …” (M’Intosh 1885: 409); collected 03 March 1874. Redescription of female. Body elongate and dorsoventrally flattened (Fig. 7 A, B); consisting of cephalosome and indistinctly 5-segmented postcephalosomic trunk; total body length 2,190 µm, measured from anterior margin of rostral projection to posterior margin of abdomen (about 2.5 mm according to M’Intosh (1885)); maximum width 677 µm, measured halfway down the second postcephalosomic somite. Cephalosome bell-shaped, separated from trunk by transverse membranous zone dorsally and ventrally (Fig. 7 A, B); dorsal surface with transverse furrow, median pore and four pairs of spiniform sensilla (Fig. 8 E). Surface of cephalosome with numerous denticles and spinules as indicated in Figs. 7 A, B and 8A, B, E. Rostral projection arising from ventral surface, rounded, fused at base (Figs. 7 B; 8E). Postcephalosomic trunk probably consisting of four thoracic prosomites and undivided urosome (Fig. 7 A, B); original somitic boundaries indicated by bilateral constrictions and transverse membranous zones dorsally and laterally; membranous zone between prosome and urosome continuous ventrally but interrupted middorsally by anal slit (Fig. 8 H). Prosomites limbless, with numerous spiniform and few setiform sensilla on dorsal surface as indicated in Fig. 7 A; forming ...