Costasiella sp. 1.? from Okinawa.

August 14, 2007
From: Yasuhiro Shamoto

Dear Dr. Rudman,

I found an animal with swelling on the rhinophores in Kerama Is. Okinawa. I first thought that it was Costasiella sp. 1. but the swelling give me doubts. Also my friends have found similar animals.

A. Locality: Zamami Island, Kerama Is, Okinawa, Japan, Pacific Ocean,
7 March 2007. Length: approx 5 mm, Depth: 8 m. Habitat: coral reef
Water temperature: 21 degrees. Photo: Yasuhiro Shamoto
B. Locality: Okinawa Is, Japan, Pacific Ocean, 30 March 2007. Length: approx 3 mm. Depth: 4 m. Habitat: coral reef. Water temperature: 21 degrees. Photo:  Masanori Ishikawa
C. Locality: Zamami Island, Kerama Is, Okinawa, Japan, Pacific Ocean,  20 March 2007. Length: approximate 2 mm. Depth: 18 m. Habitat: coral reef
Water temperature: 21 degrees. Photo: Yukari Sato

I would be grateful for any comment

Yours sincerely
Yasuhiro Shamoto

yasunao515@cyber.ocn.ne.jp

Yasuhiro Shamoto, 2007 (Aug 14) Costasiella sp. 1.? from Okinawa.. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20158

Dear Yasu,
I am not quite sure why these animals all have swellings on the rhinophores like this. Some species of sacoglossans use the cerata and rhinophores as secondary pumps but that is a rhythmic swelling and narrowing not a permanent swelling. Perhaps Kathie Jensen has a comment. I would consider them to be Costasiella sp. 1.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Aug 14). Comment on Costasiella sp. 1.? from Okinawa. by Yasuhiro Shamoto. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20158

Factsheet

Costasiella sp. 1.

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