January 12, 2006
From: Karen Christensen
Bill is this a slug or a flatworm?
I know it's not the best picture in the world, but it's all I have. I have three of these creatures that came on this piece of coral. They extend a "fishing line" at night that has several little lines coming off of the main line. The retract and launch several times as if feeding or "fishing" for food. It takes on the color of its surroundings.
I currently have three of them in my tank with other corals and need to know if they can stay or need to be put in their own tank.
Thank you so much for your assistance.
Brooklyn, WI, USA
email@example.comChristensen, K., 2006 (Jan 12) Can you identify this one?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15526
I guess I should just say I don't know. You don't give me any clues where the animals come from. I guess WI stands for Wisconsin so I guess they aren't from your home state.
I can't see enough detail to be sure what phylum they belong to but your description of them extending a fishing line with little lines off it makes me wonder if you have some benthic ctenophores. If so they should produce a string at each end of the body. Have a look at the photos and messages on the benthic ctenophore Fact Sheet and see if they look similar. There are good photos of some from Turkey with their 'fishing lines' extended.
Benthic ctenophores from Bali
From: Supapong Areeprasertkul, October 27, 2008
Benthic ctenophore from Bali
From: Ovidiu, June 20, 2006
Re: Aglajid eating a benthic ctenophore
From: Brian Francisco, January 14, 2006
A benthic ctenophore from the Philippines
From: Mabel Fang, February 24, 2004
An organism on Caulerpa prolifera
From: Levent Cavas, December 19, 2003
What is this 'red thing' on Halgerda?
From: Valda Fraser, November 26, 1999