Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Megacohors: Osteoglossocephalai
Supercohors: Clupeocephala
Cohors: Otomorpha
Subcohors: Ostariophysi
Sectio: Otophysa
Ordo: Siluriformes
Familia: Cetopsidae
Genus: Helogenes
Helogenes is a genus of whale catfish found in tropical South America.
Helogeneinae is the sister taxon of Cetopsinae, the other subfamily in the family Cetopsidae.[1]
Species
There are currently four recognized species in this genus:[2]
Helogenes castaneus (Dahl, 1960)
Helogenes gouldingi Vari & H. Ortega, 1986
Helogenes marmoratus Günther, 1863
Helogenes uruyensis Fernández-Yépez, 1967
Distribution
Helogenes species occur through much of the Amazon River basin, the southern portions of the Orinoco River basin, the coastal rivers of the Guianas, and at least the lower portions of the Tocantins River.[3]
Description
In Helogenes, the dorsal fin base is short, the anal fin base is elongate, the dorsal and pectoral fins lack spines, the adipose fin is usually present, but is reduced or absent in one population of one species.[4][3] Helogenes species grow to about 4.3–7.3 centimetres (1.7–2.9 in) SL.[2]
Ecology
Helogenes species feed on allochthonous insects.[1] The only species for which details of the ecology are known is H. marmoratus (refer to article for that species).
References
Vari, Richard P.; Ferraris, Carl J.; de Pinna, Mário C. C. (2005). "The Neotropical whale catfishes (Siluriformes: Cetopsidae: Cetopsinae), a revisionary study" (PDF). Neotropical Ichthyology. 3 (2): 127–238. doi:10.1590/S1679-62252005000200001. Archived from the original (PDF) on 2007-09-27.
Froese, Rainer and Pauly, Daniel, eds. (2011). Species of Helogenes in FishBase. December 2011 version.
Ferraris Jr., Carl J.; Vari, Richard P. (2007-06-07). "Whale Catfishes Cetopsidae". Retrieved 2007-08-04.
Nelson, Joseph S. (2006). Fishes of the World. John Wiley & Sons, Inc. ISBN 0-471-25031-7.
Retrieved from "http://en.wikipedia.org/"
All text is available under the terms of the GNU Free Documentation License
