Conorhynchos conirostris

Conorhynchos conirostris
Systematics
Cohort :	Otomorpha
Sub-cohort :	Ostariophysi
Order :	Catfish (Siluriformes)
	incertae sedis
Genre :	Conorhynchos
Type :	Conorhynchos conirostris
Scientific name of the genus
	Conorhynchos
	Bleeker , 1858
Scientific name of the species
	Conorhynchos conirostris
	( Valenciennes in Cuvier & Valenciennes, 1840)

Conorhynchos conirostris is a species of fish from the order of the catfish-like (Siluriformes), which occurs endemically in the Rio São Francisco in Brazil . It is the only species in the monotypical genus Conorhynchos . The exact systematic position of the species is currently unclear. The species is of regional economic importance and is considered threatened due to environmental pollution and the destruction of its habitat by dam construction projects.

features

The species reaches a maximum length of about one meter and a weight of up to 13 kilograms. The barbels are very short. The lower mouth has thick, wrinkled lips that can be stretched out and rolled outwards when at rest. The gill trap has numerous, dense thorns that cross each other and thus form a kind of filter.

Way of life

Conorhynchos conirostris feeds mainly on molluscs , insect larvae and small crustaceans that are ingested from the ground. The species performs migrations.

Systematics

The species was variously assigned to the catfish (Pimelodidae). However, recent anatomical and molecular biological studies speak against this classification. The species is therefore currently not classified in any family , but together with the catfish, the great-mouth catfish (Pseudopimelodidae) and the Heptapteridae in the superfamily Pimelodoidea .

swell

Marilia de C. Brasil-Sato, Michelle D. Dos Santo: Metazoan parasites of Conorhynchos conirostris (Valenciennes, 1840), an endemic siluriform fish of the Sao Francisco . In: Revista brasileira de parasitologia veterinaria . tape 14 , no. 4 , 2005, p. 160–166 (English, com.br [PDF]).
Sirlene S. Rodrigues, Eliane Menin: Anatomia da cavidade bucofaringiana de Conorhynchos conirostris (Valenciennes, 1840) (Siluriformes) . In: Revista Ceres (Brazil) . tape 52 , no. 304 , 2005, pp. 843–862 (English, ufv.br [PDF]).

Individual evidence

↑ Marques, M., Knoppers, B., Lanna, AE, Abdallah, PR and M. Polette: Global International Waters Assessment, Brazil Current, GIWA Regional assessment 39 . University of Kalmar on behalf of the United Nations Environment Program, 2004, ISSN 1651-940X , p. 73 ( unep.org [PDF]).
↑ JP Sullivan, Lundberg JG; Hardman M: A phylogenetic analysis of the major groups of catfishes (Teleostei: Siluriformes) using rag1 and rag2 nuclear gene sequences . In: Mol Phylogenet Evol. . 41, No. 3, 2006, pp. 636-62. doi : 10.1016 / j.ympev.2006.05.044 .

Web links

Conorhynchos conirostris on Fishbase.org (English)

[1] Marques, M., Knoppers, B., Lanna, AE, Abdallah, PR and M. Polette: Global International Waters Assessment, Brazil Current, GIWA Regional assessment 39 . University of Kalmar on behalf of the United Nations Environment Program, 2004, ISSN 1651-940X , p. 73 ( unep.org [PDF]).

[2] JP Sullivan, Lundberg JG; Hardman M: A phylogenetic analysis of the major groups of catfishes (Teleostei: Siluriformes) using rag1 and rag2 nuclear gene sequences . In: Mol Phylogenet Evol. . 41, No. 3, 2006, pp. 636-62. doi : 10.1016 / j.ympev.2006.05.044 .