Dieidolycus leptodermatus
Dieidolycus leptodermatus Anderson, 1988
First described in: Anderson, M. E. (1988). Biology of the Antarctic Seas 19. Studies on the Zoarcidae (Teleostei: Perciformes) of the Southern Hemisphere. I. The Antarctic and Subantarctic regions. <em>Antarctic Research Series, Washington DC.</em> 47: 59-113.
Descriptions from checklists and floras indexed by GBIF
description
Description. Vertebrae 22 - 23 + 55 - 58 = 78 - 81; D 73 - 77; A 55 - 59; P 16 - 17; C (6) 8 - 10; pelvics 2; branchiostegal rays 6; gill rakers 2 - 3 + 9 - 11 = 12 - 13; vomerine teeth 6 - 15; palatine teeth 6 - 17; pseudobranch absent. Following proportions as percent SL: head length 21.3 - 24.7; head width 9.5 - 11.3; head depth 11.0 - 11.6; predorsal length 23.2 - 24.6; preanal length 46.6 - 48.4; pectoral base depth 4.4 - 5.2; pectoral-fin length 12.9 - 14.0; body depth 9.2 - 10.9; gill slit length 7.5 - 8.4. Following proportions as percent HL: head width 40.7 - 52.9; head depth 49.1 - 52.1; upper jaw length 34.5 - 38.5; snout length 26.5 - 33.0; eye diameter 12.4 - 15.5; gill slit length 33.4 - 37.4; pectoral-fin length 58.1 - 62.4; interorbital width 6.6 - 7.9; interpupillary width 20.3 - 27.2; caudal-fin length 20.9 - 25.4; pelvic-fin length 7.2 - 24.4. Pectoral base / depth ratio: 31.7 - 40.1. Head roughly triangular, eye (spectacle) small, head pores prominent, with whitish outline. Flesh gelatinous, but lateral line present (usually absent in gelatinous zoarcids; Anderson, 1994). Lateral line originating just above upper end of gill opening and coursing midlaterally to
Studies on the Zoarcidae of the southern hemisphere. X. New records from western Antarctica.
diagnosis
Diagnosis. Dieidolycus leptodermatus is distinguished from its two congeners by the following combination of characters: suborbital pores 6, occipital and interorbital pores absent, pectoral-fin rays 16 - 17; dorsal fin origin associated with vertebrae 2 - 3 (not 23 ' as mistakenly given in Anderson, 1990 b).
Studies on the Zoarcidae of the southern hemisphere. X. New records from western Antarctica.
discussion
Remarks. This rare eelpout was originally described from three specimens taken in the Scotia and Ross seas at depths of 2273 - 3040 m by the U. S. Antarctic Research Program in 1966 - 1967. The present six specimens include four smaller and one larger than the type series, including the largest known, a 171 mm SL juvenile female. The size of the immature ovary of this specimen indicates the species probably attains more than 300 mm.
Studies on the Zoarcidae of the southern hemisphere. X. New records from western Antarctica.
materials_examined
Material examined. Scotia Sea: USNM 356650 (3 specimens; 115 - 150 mm SL) and RUSI 60087 (2; 88 - 171 mm SL): off Candelmas Isl., 57 ° 00.4 ' S, 26 ° 10.1 ' W, ISLAS ORCADAS coll. UMO 38, 10 ft beam trawl, 2744 - 2745 m, 22 May 1975, H. H. DeWitt. USNM 356655 (1; 134 mm SL): W of South Orkney Islands, 60 ° 45.5 ' S, 48 ° 13.5 ' W, ISLAS ORCADAS coll. UMO 116, 10 ft beam trawl, 2511 - 2542 m, 18 Feb. 1976, H. H. DeWitt.
Studies on the Zoarcidae of the southern hemisphere. X. New records from western Antarctica.
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From the GBIF Backbone Taxonomy and occurrence records (GBIF.org), with Wikipedia and the Source Library. GBIF species 2381146.