Elysia obtusa
Baba, 1938

Superfamily: ELYSIOIDEA
Family: Elysiidae


Widespread western Pacific distribution from Japan & Hong Kong to eastern Australia.


UPPER: Tsim Chau, Hong Kong. 10m depth, length 1.5 cm. Photo: Leslie Chan.
LOWER: Echizen Beach, Fukui prefecture, West coast of Japan. 18th July, 2001. Depth: 5m Size: 10mm. Photo: Nishina Chikako.

Animal transucent yellow with white spots scattered over the body, head and parapodia. Edge of parapodia lined with bright white line. In sonme animals the green of the digestive gland causes the parapodia to be dark green in colour bbut from the range of photos in the Forum it appears that the green colouration is probably a temporary colouration dependent on how recently an animal has been feeding. Dark green parapodia probably corresponds to a recently fed animal while predominantly yellow animals have probably not fed for some time. Some authors have identifies this northwestern pacific species with the Carribbean E. flava, but until the antomy of the two are compared I would think such a synonymy is premature.

Eveline Marcus (1980) describes Elysia flava Verrill, 1901 are reported to be light yellow with white specks and faint dull brown markings on the head and neck. The parapodia are light green with a white edging and dendritic white branches extending in from the edge. The inner surface is almost black.

• Baba, K (1938) Opisthobranchia of Kii, Middle Japan. J. Dept. Agric. Kyusyu Imp. Univ., 6(1): 1-19.
• Baba, K. (1949) Opisthobranchia of Sagami Bay collected by His Majesty The Emperor of Japan. Iwanami Shoyen, Tokyo. 194pp., 50 Pls.
• Carlson, C.H. & Hoff, P.J. (1978) The identifiable Elysia from Guam (Elysiidae, Sacoglossa, Opisthobranchia). Micronesica, 14: 89-113.

Authorship details
Rudman, W.B., 2001 (July 24) Elysia obtusa Baba, 1938. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/elysobtu

Related messages

  1. Elysia obtusa from India
    From: Vishal Bhave, January 20, 2010
  2. Elysia obtusa from Hawaii
    From: Keoki Stender, June 22, 2006
  3. Elysia obtusa from South Korea
    From: Dong Bum Koh, June 9, 2005
  4. Re: Development in Elysia obtusa
    From: Jun Imamoto, September 25, 2002
  5. Re: Development in Elysia obtusa
    From: Kathe Jensen, September 16, 2002
  6. Post-settlement juveniles of Elysia obtusa
    From: Jun Imamoto, September 14, 2002
  7. Habitat of Elysia obtusa
    From: Nishina Masayoshi, July 29, 2001
  8. Elysia obtusa from the Marshall Ids
    From: Scott Johnson, July 28, 2001
  9. Elysia obtusa and its diet
    From: Kathe R. Jensen, July 27, 2001
  10. Elysia obtusa from Heron Island
    From: Julie Marshall, July 26, 2001
  11. Another photo of Elysia obtusa
    From: Nishina Masayoshi, July 26, 2001
  12. Re: Elysia obtusa from Japan
    From: Cynthia Trowbridge, July 26, 2001
  13. Elysia obtusa from Japan
    From: Nishina Masayoshi & Chikako, July 25, 2001
  14. Elysia obtusa from Hong Kong.
    From: Leslie Chan, July 25, 2001
  15. Elysia obtusa from Hong Kong
    From: Bill Rudman & Brian Darvell, July 25, 2001

Show factsheet and all related messages