Lycenchelys argentina Marschoff, Torno and Tomo 1977

• Main Author: M. Eric Anderson
• Format: Other/Unknown Material
• Language: unknown
• Published: 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Actinopterygii; Perciformes; Zoarcidae; Lycenchelys; Lycenchelys argentina; Argentina; South Orkney Islands; Orcadas; DeWitt
• Online Access: https://zenodo.org/record/6258157; https://doi.org/10.5281/zenodo.6258157

Lycenchelys argentina Marschoff, Torno and Tomo, 1977 (Fig. 1) Lycenchelys argentinus Marschoff, Torno and Tomo, 1977: 3, text fig. (type locality: off South Orkney Islands. Lycenchelys argentina: Anderson, 1988: 92; Anderson, 1990b: 260, fig. 4. Material examined. USNM 356657 (2 specimens; 90-106 mm SL), W. of South Orkney Isls., 60°45.5'S, 48°13.5'W, 2511-2542 m, ISLAS ORCADAS coll. UMO 116, 10 ft beam trawl, 18 Feb. 1976, H. H. DeWitt. Diagnosis. Lycenchelys argentina is distinguished from its congeners by the following combination of characters: Vertebrae ca. 90 (holotype) to 95; dorsal-fin origin associated with vertebrae 8-9; caudal-fin length 25.7-30.2% SL; suborbital pores 6 + 0; gill rakers 3 + 12-15 = 15-18; P 17-18; minute papillae covering dorsal region of head and lips in adults. Description. Vertebrae 20-21 + 71-74 = 91-95; D 84-87; A 74-77; P 17-18; C 9-10; pelvics 3; branchiostegal rays 6; gill rakers 3 + 12; vomerine teeth 3-4; palatine teeth 5-8; pseudobranch filaments 3-4; pyloric caeca 2. Following proportions as percent SL: head length 17.6-17.8; head width 8.1-8.7; head depth 8.0-8.5; predorsal length 22.9-23.4; preanal length 33.6-36.1; pectoral-base depth 3.9-4.3; pectoral-fin length 11.4-11.7; body depth 6.0-6.5; gill slit length 6.4-7.1. Following proportions as percent HL: head width 45.5-49.5; head depth 44.9-48.1; upper jaw length 41.2-42.4; snout length 21.4-23.7; eye diameter 20.6-23.0; gill slit length 36.1-39.9; pectoral-fin length 63.9-66.0; interorbital width 10.2-10.3; interpupillary width 23.1-24.1; caudal-fin length 25.7-28.0; pelvic-fin length 15.6-18.2; pectoral base/length ratio: 34.2-37.3. Variation in cephalic pore patterns between these two juveniles and the 248 mm SL adult holotype are noteworthy. All three specimens with suborbital pores 6 + 0 and eight preoperculomandibular pores. However, the holotype has a median occipital and an interorbital pore, both absent in the juveniles. The postorbital canal of the holotype has four pores on the right and three on the ...