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The above specimen was was identified by Dr. Richard Willan, thanks! He writes pers. comment:
"I think it an Atys sp. Unfortunately I cannot identify Atys spp. alive because the characters upon which they are based relate to their shells."
How to cite:
Köhler, E. (2017), published 15 July 2017, Atys sp. 04 Genus: de Montfort, 1810
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Atys_sp_04.htm