Elysia obtusa Baba, 1938
The animal is dark yellow on the head and rhinophores with dark green parapodia that are irregularly covered by small white papillae. White dots are found on the head anterior to the eyes. Smaller red-colored epidermal dots cover the body giving an orange tinge to some parts of the animal. The rhinophores are rolled and somewhat short. The pericardium is short and oval from which two pairs of dorsal vessels originate: one pair that branches posterior to the pericardium and another pair with little to no branching anterior to the pericardium. The parapodial flaps are held over the body in life and do not extend to the end of the tail. These parapodia contain the digestive gland tubules and are outlined by a faint orange band and more visible white line (Jensen, 2003).
It is possible that this species should be synonymized with Elysia flava Verrill, 1901 (Jensen, 1901).
The length is 20 mm.
The type locality is Seto, Japan. It also occurs in Japan, Hong Kong, Guam, Heron Island, Marshall Islands, and Hawaii.
Eggs are yellow and are laid in a regular spiral of 5-6 whorls. White extra-capsular yolk is present in the outer three whorls of the egg mass (Jensen, 2003).
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.