Leptoderma macrophthalmum Byrkjedal, Poulsen & Galbraith, 2011, sp.n.

• Main Authors: Byrkjedal, Ingvar, Poulsen, Jan Yde, Galbraith, John
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Actinopterygii; Osmeriformes; Alepocephalidae; Leptoderma; Leptoderma macrophthalmum; North Atlantic
• Online Access: https://doi.org/10.5281/zenodo.5615930; http://treatment.plazi.org/id/03DD87DE6E7D916185945E359B5EFD63

Leptoderma macrophthalmum sp.n. (Fig. 2–3) Holotype. NORTH ATLANTIC, 42o47’ N – 29o38’ W, 8 July 2004, 2107– 2063 m gear depth, soft bottom, R/V “G. O. Sars”, super station 42, local station 368, ser. 1150, bottom trawl (shrimp trawl). ZMUB 19686. Diagnosis. The species differs from three of the four other congeneric species ( L. affinis, L. macrops and L. retropinna ) by having a distinct gap between the posterior ends of the dorsal and anal fins and the beginning of procurrent caudal finrays. This gap is absent in the three species mentioned, but present in the fourth ( L. lubricum ), from which L. macrophthalmum differs by having a lack of dermal papillae along the lateral line, pectoral fins lower on body, a larger eye relative to head dimensions, and a shorter pre-dorsal length. Description . SL 151 mm, fresh weight 16 g. Dimensions as per cent of SL as follows: Pre-dorsal length 49.3, pre-anal length 45.7, pre-pelvic length 39.5, dorsal fin base 31.1, dorsal procurrent caudal fin section 15.5, anal procurrent caudal fin section 15.1, anal fin base 40.7, pectoral fin length (left) 7.3, pelvic fin length (left) 4.8, greatest body depth 12.8, caudal peduncle depth 2.1, maximal head width (behind eyes) 11.3, head length 23.2, snout length 7.0, horizontal orbital diameter 9.3, post-orbital head length 7.2, upper jaw length 7.9. Eye diameter as percent of head length 40.3. Fin-ray counts as follows: D 32, procurrent dorsal fin 21, A 47, procurrent anal fin 20, pectoral fins 8 (left and right), pelvic fins 8 (left and right), caudal fin 16. Number of gillrakers on first arch 19. Five branchiostegal rays on each side. Total number of vertebrae 67 (15 + 52). No scales present. Body slender and compressed, greatest body depth a distance from the snout of 13.9 % of SL. Eyes large, upper margin protruding above the dorsal profile of the head. The dorsal profile of the forehead in the fresh specimen convex, but straightening over the snout (shrinkage caused by preservation has decreased the convexity of the forehead ...