Olivaichthys

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: Diplomystidae
Genus: Olivaichthys
Species: O. cuyanus – O. mesembrinus – O. viedmensis
Name

Olivaichthys Arratia, 1987
References

Carl J. Ferraris, Jr., 2007, Zootaxa 1418: 1–628 [1]

Olivaichthys is a genus of velvet catfishes endemic to Argentina.

Recently several authors have synonymized this genus with Diplomystes.[1] A molecular analysis has proposed that trans-Andean Diplomystes and the cis-Andean Olivaichthys are so closely related (in addition to the close morphological similarity), that Olivaichthys should not be recognized. However, this is strange as recent divergence is unlikely with the species on either side of the Andes.[2]
Species

Olivaichthys cuyanus (Ringuelet, 1965)
Olivaichthys mesembrinus (Ringuelet, 1982)
Olivaichthys viedmensis (MacDonagh, 1931) (Otuno)

References

Froese, Rainer and Pauly, Daniel, eds. (2011). Species of Olivaichthys in FishBase. December 2011 version.

Lundberg, John G.; Berra, Tim M.; Friel, John P. (March 2004). "First description of small juveniles of the primitive catfish Diplomystes (Siluriformes: Diplomystidae)" (PDF). Ichthyological Exploration of Freshwaters. 15 (1): 71–82. Archived from the original (PDF) on 2009-03-26.
Sullivan, JP; Lundberg JG; Hardman M (2006). "A phylogenetic analysis of the major groups of catfishes (Teleostei: Siluriformes) using rag1 and rag2 nuclear gene sequences". Molecular Phylogenetics and Evolution. 41 (3): 636–62. Bibcode:2006MolPE..41..636S. doi:10.1016/j.ympev.2006.05.044. PMID 16876440.