Sagaminopteron psychedelicum from Hachijo

August 16, 2002
From: Nishina Masayoshi

Dear Bill,
Sagaminopteron psychedelicum is rather rare at Hachijo island. K. Tanaka who is always guiding us there told me that the black spot in the lower right image, is the eye (red arrow).

Date: 8 June 2002
Location: Hachijo Is. Tokyo, Japan.
Lengh: 8mm
Depth: 6m
Water temp: 20C degree
Photo: C. Nishina

Best Regards,
Nishina Masayoshi

nishina@wips.co.jp

Masayoshi, N., 2002 (Aug 16) Sagaminopteron psychedelicum from Hachijo. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7730

Dear Nishina & Chikako,
Thanks for these wonderful photos. Yes the black spot is the eye. In most sea slugs the eyes are difficult to see because they are are beneath the skin on the inside edge of the body wall. Quite a few species, like Sagaminopteron psychedelicum, have a semitransparent or translucent patch above each of the eyes so some light can get through. This is particularly noticeable in species with a very opaque pigment. A good example is Tambja abdere.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Aug 16). Comment on Sagaminopteron psychedelicum from Hachijo by Nishina Masayoshi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7730

Factsheet

Sagaminopteron psychedelicum

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