The type locality is Sagami Bay, Japan. They occur throughout Japan and in Hong Kong.
Life History and Behavior
The egg mass is spirally coiled and contains small white spheres of extra-capsular yolk. One egg mass observed by Jensen (2003) had 6 whorls.
Relevance to Humans and Ecosystems
Jensen, K.R. 2003. Distributions, diets and reproduction of Hong Kong sacoglossa (Mollusca: Opisthobranchia): a summary of date, 1980-2001 in Perspectives on Marine Environment Change in Hong Kong and Southern China, 1977-2001 (ed. B. Morton). Proceedings of an International Workshop Reunion Conference, Hong Kong 21-26 October, 2001. Hong Kong University Press.