Rhinodoras

Taxobox
name = "Rhinodoras"
fossil_range = Late Miocene - Recent
regnum = Animalia
phylum = Chordata
classis = Actinopterygii
ordo = Siluriformes
familia = Doradidae
genus = "Rhinodoras"
genus_authority = Bleeker, 1862
subdivision_ranks = Binomial name
subdivision =
"Rhinodoras armbrusteri"
Sabaj, Taphorn & Castillo G., 2008
"Rhinodoras boehlkei"
Glodek, Whitmire & Orcés, 1976
"Rhinodoras dorbignyi"
(Kner, 1855)
"Rhinodoras gallagheri"
Sabaj, Taphorn & Castillo G., 2008
"Rhinodoras thomersoni"
Taphorn & Lilyestrom, 1984

"Rhinodoras" is a genus of catfishes (order Siluriformes) of the family Doradidae. It includes five species, "R. armbrusteri", "R. boehlkei", "R. dorbignyi", "Rhinodoras gallagheri", and "R. thomersoni".cite journal|title=Two New Species of Thicklip Thornycats, Genus "Rhinodoras" (Teleostei: Siluriformes: Doradidae)|first=Mark H.|last=Sabaj|coauthor=D. Taphorn, O. Castillo|journal=Copeia|volume=2008|pages=209–226|year=2008|doi=10.1643/CI-05-143]

Fossil record

"Rhinodoras" has been identified in the fossil record from the late Miocene Urumaco Formation (about 9 million years of age), Falcón State, Venezuela. "R. thomersoni" may have a minimum age of 8 million years.

Distribution

"Rhinodoras" species are distributed in South America. "R. armbrusteri" is known from the Takutu River (and its tributary the Ireng River) thatdrains into the upper Rio Branco in Guyana and Roraima State, Brazil; it is also known from the Rupununi River (Essequibo Riverbasin) in southwestern Guyana. "R. boehlkei" originates from the Upper Amazon River basin.FishBase species|genus=Rhinodoras|species=boehlkei|year=2007|month=June] "R. dorbignyi" is found in the Paraná River basin.FishBase species|genus=Rhinodoras|species=dorbignyi|year=2007|month=June] "R. gallagheri" is known from Apure River, Capanaparo River, and Arauca River, all left bank tributaries of the middle Orinoco, in the llanos regions of Apure and Barinas States of Venezuela. It is also known from the Aguas de Limon River in the Arauca Department of Colombia. "R. thomersoni" inhabits the river basins along the southwest shore of Lake Maracaibo (Santa Ana, Catatumbo and Escalante Rivers).FishBase species|genus=Rhinodoras|species=thomersoni|year=2007|month=June]

Appearance and anatomy

"Rhinodoras" species are distinguished from other doradids by a unique combination of coloration (sides darkly mottled, usually with wide dark bars, light midlateral stripe absent) and lip shape (labial tissue thick, fleshy, considerably expanded at corners of mouth forming rounded flap-like extensions with entire margins, all surfaces rugose with low, rounded, and tightly spaced papillae, and distal margin of lower lip draped over bases of outer and inner jaw barbels, at times nearly encircling the latter). "R. boehlkei" grows to a length of about 13.3 centimetres (5.2 in) SL. "R. dorbignyi" reaches a maximum size of about 50 cm (20 in) TL. "R. thomersoni" can grow to 20 cm (7.9 in) SL.

References