Jorunna osae is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Discodorididae.Bouchet, P. (2015). Jorunna osae Camacho-Garcia & Gosliner, 2008. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2015-10-10
Etymology Jorunna osae is named after the Osa Conservation Area in Costa Rica.
Distribution This species was described from Playa Gallardo, Golfito, Osa Conservation Area, Costa Rica, Pacific Ocean. Additional specimens from Tempisque Conservation Area and Osa Conservation Area are listed in the original description. Most of the specimens are from the intertidal region with one from 9–13 m depth.
Description Jorunna osae is a pale brown Jorunna with darker oval markings. It is reported to reach 8 mm in length.Jorunna osae : Photograph at Gastropods.com
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