May 4, 2005
From: Binyamin Koretz
We thought that this would be the Red Sea endemic Atys ehrenbergi (Issel, 1869), based on photos we've seen of dead shells. Do you have any information on this species?
Locality: Eilat, Satil Area, Israel. Red Sea (Gulf of Eilat). Depth: 24 m. Length: ca. 1.5 cm. 30 Apr 2005 (night). sea grass and patch reef. Photographer: Binyamin and Shulamit Koretz
Koretz, B., 2005 (May 4) Atys ehrenbergi from the Red Sea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/13704
Your animal looks to me like a typical juvenile Atys naucum, which have these axial brown lines, absent in adults.
As you say, the name Atys ehrenbergi has been used in some checklists and websites. I was interested in the use of the name so I had a look at Issel's original description and find that Alicula ehrenbergi Issel 1869 is based on a single white fossil shell - with no colour lines visible. [Issel, 1869: p281-2. Pl. 4, fig 6] the shell was 4.5 mm high x 2.75 mm wide.
The general shape looks similar, but without any further information, there is no way the brown-lined shell presently identified with A. ehrenbergi can be confidently identified as that species. I see no reason not to identify it as A. naucum, which is a 100 years older name anyway.
- Issel, A. (1869) Malacologia del Mar Rosso. Biblioteca Malacologica: Pisa. 1-387, 5 Pls [Description in: Parte Terza: Cataloga delle Cochiglie fosiili raccolte sulle spiagge del Mar Rosso].
Juvenile Atys naucum from the Philippines
From: Erwin Koehler, March 27, 2002
Atys from Sulawesi
From: Lindsay Warren, January 26, 2001
Atys naucum gizzard plates
From: C. Carlson & P.J. Hoff, December 23, 1999
Erwin's Atys sp. is Atys naucum
From: Terry Gosliner, January 20, 1999
Atys?, Haminoea? from Red Sea
From: Erwin Koehler, January 19, 1999