Trichogenes longipinnis, novo gênero e espécie de Trichomycterinae do sudeste do Brasil (Pisces, Siluriformes)

Britski, Heraldo A.; Ortega, Hernan

doi:10.1590/S0101-81751982000300011

Resumo

Trichogenes longipinnis, a new genus and species, is described from small litoranean rivers of Southeastern Brazil. The new genus was included in the Trichomycterinae, but when compared with two other genera of the subfamily (Trichomycterus and Hatcheria) revealed significant differences. Trichogenes can be characterized as follows: (1) opercle with two patches of spines; spines present on the interopercle also; (2) nasal barbel present; two barbels at the angle of the mouth; no mental barbels; (3) orbit with a free margin; (4) gill-membranes free from the isthmus; (5) first ray of the pectoral fin not pungent; (6) dorsal fin short (9 rays), nearer the caudal fin base than the tip of the snout; (7) origin of the ventral in front of the middle of the body; (8) anal long (more than 30 rays), its origin before the dorsal fin base; (9) infraorbital canal complete, formed by the lacrimal plus 6 tube-shaped infraorbitals and (11) gas-bladder capsule separated from the posterior part of the skull.

Trichogenes longipinnis, novo gênero e espécie de Trichomycterinae do sudeste do Brasil (Pisces, Siluriformes)

Heraldo A. Britski^I; Hernan Ortega^II

^IMuseu de Zoologia da Universidade de São Paulo

^IIMuseo de Historia Natural, Universidad Nacional Mayor de San Marcos, Peru

ABSTRACT

Trichogenes longipinnis, a new genus and species, is described from small litoranean rivers of Southeastern Brazil. The new genus was included in the Trichomycterinae, but when compared with two other genera of the subfamily (Trichomycterus and Hatcheria) revealed significant differences. Trichogenes can be characterized as follows: (1) opercle with two patches of spines; spines present on the interopercle also; (2) nasal barbel present; two barbels at the angle of the mouth; no mental barbels; (3) orbit with a free margin; (4) gill-membranes free from the isthmus; (5) first ray of the pectoral fin not pungent; (6) dorsal fin short (9 rays), nearer the caudal fin base than the tip of the snout; (7) origin of the ventral in front of the middle of the body; (8) anal long (more than 30 rays), its origin before the dorsal fin base; (9) infraorbital canal complete, formed by the lacrimal plus 6 tube-shaped infraorbitals and (11) gas-bladder capsule separated from the posterior part of the skull.

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AGRADECIMENTOS

Agradecemos a Fernando Bignardi e Carlos Alberto G. da Cruz a doação dos exemplares que serviram de base para a presente descrição e ao Dr. Naércio A. Menezes pelas críticas e sugestões.

¹
Arratia Fuentes, G. & A. Chang Garrido, 1975. Osteocráneo de Nematogenys inermis Guichenot 1848 y consideraciones acerca de la primitividad del género (Peces Siluriformes, Trichomycteridae). Publs ocas. Mus. nac. Hist. nat. Santiago 19:1-7.
Eigenmann, C. H., 1918. The Pygidiidae, a family of South American catfishes. Mem. Carneg. Mus. 7 (5):259-398, pls. 36-56.
Greenwood, P. H. et al., 1966. Phyletic studies of Teleostean fishes, with a provisional classification of living forms. Bull Am. Mus. nat. Hist. 131 (4):339-456, pls. 21-23.
Regan, C. T., 1911. The classification of the Teleostean fishes of the order Ostariophysi - 2. Siluroidea. Ann. Mag. nat. Hist. 8 (8):553-577.
Weitzman, S. H., 1962. The osteology of Brycon meeki, a generalized characid fish, with an osteological definition of the family. Stanford Ichthyol. Bull. 8:1-77.

Datas de Publicação

Publicação nesta coleção
28 Ago 2009
Data do Fascículo
1982

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] ¹
Arratia Fuentes, G. & A. Chang Garrido, 1975. Osteocráneo de Nematogenys inermis Guichenot 1848 y consideraciones acerca de la primitividad del género (Peces Siluriformes, Trichomycteridae). Publs ocas. Mus. nac. Hist. nat. Santiago 19:1-7.

[2] Eigenmann, C. H., 1918. The Pygidiidae, a family of South American catfishes. Mem. Carneg. Mus. 7 (5):259-398, pls. 36-56.

[3] Greenwood, P. H. et al., 1966. Phyletic studies of Teleostean fishes, with a provisional classification of living forms. Bull Am. Mus. nat. Hist. 131 (4):339-456, pls. 21-23.

[4] Regan, C. T., 1911. The classification of the Teleostean fishes of the order Ostariophysi - 2. Siluroidea. Ann. Mag. nat. Hist. 8 (8):553-577.

[5] Weitzman, S. H., 1962. The osteology of Brycon meeki, a generalized characid fish, with an osteological definition of the family. Stanford Ichthyol. Bull. 8:1-77.