Occidentella athadona (Bergh, 1875), comb. n. North West Pacific, Kamchatka. ZMMU Op-498, living animal 19 mm length: A dorsal view B lateral view (fixed) C ventral view D details of cerata E jaw, SEM, scale bar = 1 mm F details of masticatory process of jaw, SEM G details of masticatory process of jaw, light microscopy H radular teeth, posterior part, SEM I reproductive system, light microscopy J reproductive system, SEM. Abbreviations: a anus agf additional glandular formation (modified prostate), am ampulla fgm female gland mass go genital opening ps penial sheath rsd distal receptaculum seminis rsp proximal receptaculum seminis vd vas deferens (very rudimentary, rapidly transits to greatly enlarged modified prostate (agf). Scale bars: E = 1 mm; F, H = 30 μm; J = 300 μm. Photos and SEM images by T.A. Korshunova, A.V. Martynov.

  Part of: Korshunova T, Martynov A, Bakken T, Evertsen J, Fletcher K, Mudianta WI, Saito H, Lundin K, Schrödl M, Picton B (2017) Polyphyly of the traditional family Flabellinidae affects a major group of Nudibranchia: aeolidacean taxonomic reassessment with descriptions of several new families, genera, and species (Mollusca, Gastropoda). ZooKeys 717: 1-139. https://doi.org/10.3897/zookeys.717.21885