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Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
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: Pimelodidae
Genus: Aguarunichthys
Species: A. inpai – A. tocantinsensis – A. torosus
Aguarunichthys (Stewart, 1986)

Aguarunichthys is a genus of long-whiskered catfishes native to South America.


There are currently three recognized species in this genus:[1]

Aguarunichthys inpai Zuanon, Rapp Py-Daniel & Jégu, 1993
Aguarunichthys tocantinsensis Zuanon, Rapp Py-Daniel & Jégu, 1993
Aguarunichthys torosus Stewart, 1986


Aguarunichthys is derived from Aguaruna, the name of a society of people from where A. torosus was collected, as well as ichthys, meaning fish. The species name of A. torosus is derived from the Latin brawny or muscular for its body form.[2] A. tocantinsensis is named for the Tocantins River from which it was first collected. A. inpai is a latinization of the National Institute of Amazonian Research (INPA).[3]
Distribution and habitat

A. inpai inhabits the middle Amazon River basin in Brazil, A. tocantinsensis originates from the Tocantins River basin in Brazil, and A. torosus is known from the Cenepa River basin of the Amazon River drainage in Peru.[4]

A. tocantinsensis has been found in areas with strong currents and rocky bottom.[3] On the other hand, A. inpai inhabits areas where the riverbed consists of sediments.[3] These fish species are rarely captured and are unknown to the local fishermen; this may be due to their deep-bottom dwelling habits.[3]

Aguarunichthys was originally described due to the distinctive finger-like projections of the gas bladder.[2] There are three pairs of barbels, one pair of long maxillary barbels and two pairs of shorter chin barbels.[2][3]

A. inpai has small spots on a cream-coloured body, while the other two species have large darker spots on an olive-brown body. A. torosus appears more elongate (it has a longer distance between its dorsal fin and adipose fin) and has a smaller eye than A. tocantinsensis.[3] These species reach about 30–40 centimetres (12–16 in) SL.[3]

Froese, Rainer and Pauly, Daniel, eds. (2012). Species of Aguarunichthys in FishBase. February 2012 version.
Stewart, Donald J. (1986). "Revision of Pimelodina and Description of a New Genus and Species from the Peruvian Amazon (Pisces: Pimelodidae)". Copeia. 1986 (3): 653–672. doi:10.2307/1444947. JSTOR 1444947.
Zuanon, Jansen A. S.; Rapp Py-Daniel, Lúcia H.; Jégu, Michel (November 1993). "Two new species of Aguarunichthys from the Amazon basin (Siluroidei: Pimelodidae)" (PDF). Ichthyol. Explor. Freshwaters. 4 (3): 251–260.
Ferraris, Carl J. Jr. (2007). "Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types" (PDF). Zootaxa. 1418: 1–628.

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