Hyphessobrycon borealis
Axel Zarske, Pierre-Yves Le Bail & Jacques Gery
Два новых вида из родов Hemigrammus и Hyphessobrycon из Французской Гвианы.
New and poorly known Characiform fi shes from French Guiana. 1. Two new Tetras of the genera Hemigrammus and Hyphessobrycon (Teleostei: Characiformes:Characidae)Abstract.
Two species of characid fi sh from French Guiana (Teleostei: Characiformes: Characidae) are described: Hemigrammus ora sp. n. and Hyphessobrycon borealis sp. n..
– Hemigrammus ora sp. n. is characterized by the following features: (1) no maxillary teeth, (2) maxilla relatively short (3.91 to 6.59 times in head length), (3) cusps or denticles of each tooth of the inner row of premaxilla arranged in a crescent line, (4) 21 to 24 branched anal fi n rays, (5) 32 to 33 lateral scales, (6) 10 to 15 pored scales in the lateral line, (7) body depth 2.94 to 3.44 times in SL, (8) head length 3.42 to 3.96 times in SL, (9) one small, round, not horizontally or vertically prolonged, humeral spot and (10) caudal spot round, not on the whole depth of the caudal peduncle and only a little on the basal parts of the middle caudal fi n rays, never reaching the tips.
– Hyphessobrycon borealis sp. n. is characterized by the following features: (1) largest teeth up to quincuspid, (2) maxilla relatively large (2.68 to 3.60 times in head length), (3) 18 to 22 branched anal fi n rays, (4) 29 to 32 lateral scales, (5) about 10 pored scales in the lateral line, (6) body depth 3.09 to 4.03 times in SL, (7) head length 3.37 to 4.00 times in SL, (8) no humeral spot and (9) caudal spot oval, not on the whole depth of the caudal peduncle and only a little on the basal parts of the middle caudal fi n rays, never reaching the tips.
Axel Zarske, Pierre-Yves Le Bail & Jacques Gery
Zoologische Abhandlungen (Dresden) 55: 17–30 , 2005 (2006)