Bigeye Chimaera

materials_examined

- 4 specimens (Chile). MNHNC P. 7282 (E. B. M. Ch. 10.192), holotype, adult male, at time of description 625 mm TL, currently 385 mm TL (due to damage of specimen), 360 mm PCL, 296 BDL, preabyssmal zone off Valpraiso, January, 1959; MNHNC P. 5724, adult male, about 445 mm TL, 365 mm PCL, 296 BDL, off Valpariso (33 ° 02, 71 ° 39 ’ W), determined by Ismael Kong U., 15 Sept 1974; MNHNC P. 6421 (A), adult female, 627 mm TL, 425 mm PCL, 355 mm BDL, vessel R / V Academic Knipovich, (41 ° 04 ’ 5 ” S, 74 ° 16 ’ 1 ” W), determined by Augusto Cornejo C., 300 m, 02 Mar 1973; MNHNC P. 6421 (B), adult female, 572 mm TL (tail broken), 493 mm PCL, 424 mm BDL, same information as (A).

A new species of chimaeroid, Hydrolagus alphus sp. nov. (Chimaeriformes: Chimaeridae) from the Galapagos Islands.

materials_examined

- 7 specimens (Peru). HUMZ 185708, adult female, 560 mm TL, 415 mm PCL, 342 mm BDL, Eastern Pacific, Peru (9 - 42.5 ' S - 9 - 43 ' S, 79 - 35.5 ' W - 79 - 43.5 ' W), 785 m; HUMZ 185709, adult male, 527 mm TL, 355 mm PCL, 358 BDL, Eastern Pacific, Peru, (9 - 42.5 ' S - 9 - 43 ' S, 79 - 35.5 ' W - 79 - 43.5 ' W), 787 m; HUMZ 167821, adult female, 515 mm TL, 420 mm PCL, 346 mm BDL, Eastern Pacific, Peru (10 - 12.2 ' S - 10 - 10.8 ' S, 79 - 06.3 ' W - 79 - 06.7 ' W), 1056 m; HUMZ 167443, adult Female, 636 mm TL, 424 mm PCL, 357 mm BDL, Eastern Pacific, Peru (9 - 20.5 ' S - 9 - 19.5 ' S, 79 - 47.7 ' W - 79 - 48.4 ' W), 1160 m; HUMZ 167820, adult female, 594 mm TL, 425 mm PCL, 353 mm BDL, Eastern Pacific, Peru (10 - 12.2 ' S - 10 - 10.8 ' S, 79 - 06.3 ' W - 79 - 06.7 ' W), 1056 m; HUMZ 167128, adult male, 612 mm TL, 391 mm PCL, 320 mm BDL, Eastern Pacific, Peru (9 - 03.7 ' S - 9 - 06.5 ' S, 80 - 00.7 ' W - 80 - 00.6 ' W), 872 m; HUMZ 173320, adult female, 540 mm TL, 420 mm PCL, 346 mm BDL, Eastern Pacific, Peru (3 - 56.2 ' S - 4 - 03.4 ' S, 81 - 16.8 ' W - 81 - 11.8 ' W), 590 m.

A new species of chimaeroid, Hydrolagus alphus sp. nov. (Chimaeriformes: Chimaeridae) from the Galapagos Islands.

diagnosis

Diagnosis. Body slender; snout short and bluntly rounded; head relatively short (HDL 24.2 – 24.5 % BDL); eyes relatively large (EYL 30.9 – 34.2 % HDL); oral and preopercular lateral line canals sharing a short common branch from the infraorbital canal; pectoral fins relatively large (P 1 A 36.5 – 40.8 % BDL), extending posterior to the insertion of pelvic fins; lateral line canal of the trunk without sinusoidal undulations; anterior and posterior regions of second dorsal fin considerably taller than middle region; anal fin absent; tail region elongate and slender (PCA 58.3 – 59.9 % BDL); caudal-fin axis horizontal with the fin nearly symmetrical, epaxial and hypaxial lobes equal sized; uniform brown coloration across entire body, with no white markings; bluish fins. Additional morphometric measurements, expressed as percentage of body length (% BDL) or head length (% HDL), and comparative data are presented in Table 5.

Records of chimaeroid fishes (Holocephali: Chimaeriformes) from the Pacific coast of Costa Rica, with the description of a new species of Chimera (Chimaeridae) from the eastern Pacific Ocean

discussion

Remarks. Although this species has a postulated distribution extending from the central coast of Mexico (González-Acosta et al. 2010) to Chile (Didier & Meckley 2009 b), there are no published records between Mexico and Peru (Didier & Meckley 2009 b). The discovery of these specimens in Costa Rican waters increases the knowledge of its marine ichthyofauna and provides evidence of a broader distributional pattern for this species in the eastern Pacific region.

Records of chimaeroid fishes (Holocephali: Chimaeriformes) from the Pacific coast of Costa Rica, with the description of a new species of Chimera (Chimaeridae) from the eastern Pacific Ocean