Genus of fishes
Olivaichthys is a genus of velvet catfishes endemic to Argentina.
Recently several authors have synonymized this genus with "Diplomystes". 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.
References.
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