Nudibranchs are, in general terms, poorly studied organisms along the Peruvian coast. The most up-to-date list of nudibranch species from the Peruvian sea to date, based on bibliographic compilation, is presented here. We compiled 31 species distributed in 2 suborders, 10 superfamilies, 20 families and 28 genera. According to the coastal-marine biogeographic provinces present in Peru, 23 species inhabit within the Warm Temperate Southeastern Pacific, 18 within the Tropical Eastern Pacific and 10 inhabit both provinces crossing the transition zone in between. Regarding distribution patterns, two species exhibit a cosmopolitan distribution (Glaucus atlanticus and Fiona pinnata), two exhibit a circumtropical distribution (Cephalopyge trematoides and Phylliroe bucephala), one exhibits a bipolar distribution in the Eastern Pacific and amphi-South American coast (Rostanga pulchra), six exhibit a amphi-South American distribution (Rostanga pulchra, Diaulula punctuolata, Doto uva, Tyrinna evelinae, Tyrinna delicata and Doris fontainii) and two species are endemic of Peru (Corambe mancorensis and Felimare sechurana). Biogeographical aspects, geographical distributions, taxonomic classification updates are supplied and discussed. In addition, a brief discussion regarding those species listed and persisted in the literature, but unconfirmed by collections (referred to herein as predicted) is presented.

Species list, nudibranchs, biogeography, geographic distribution, country species richness