Description: English: Alder J. & Hancock A. (1845-1855). A monograph of the British nudibranchiate Mollusca: with figures of all the species. The Ray Society, London. Published in 8 parts:Part 4 Fam. 1 Plate 20 [1848]. Triopa claviger synonym Limacia clavigera (O. F. Müller, 1776) accepted name. Date: 1848. Source:
https://www.biodiversitylibrary.org/item/131598#page/184/mode/1up. Author: Albany Hancock.