Ilbia mariana
Hoff & Carlson, 1990

Superfamily: RUNCINOIDEA
Family: Ilbiidae


Previously known only from the Mariana Islands, but reported below from Sulawesi, Indonesia.


UPPER: 3.3mm; Guam, Bile, boat channel;  27 April 1990. LOWER: 3.2mm; Guam, Cocos Lagoon; 6 November 1971
PHOTOS: Clay Carlson.

This species was reported by Hoff & Carlson to be quite variable in colour, two extremes being illustrated here. They record over 700 specimens from the Mariana Island chain, the largest being 4.2mm long, but were unable to find it south of the island of Guam. See Lindsay Warren's message below, for a record from Indonesia.

• Hoff, PJ. & Carlson, CH. (1990). A new Runcinacea from the Mariana Islands (Gastropoda: Opisthobranchia). Venus, Japanese Journal of Malacology, 48(4): 263-269.

Authorship details
Rudman, W.B., 1999 (March 23) Ilbia mariana Hoff & Carlson, 1990. [In] Sea Slug Forum. Australian Museum, Sydney. Available from

Related messages

  1. Ilbia mariana in an ascidian
    From: Yuji Fujie, July 22, 2006
  2. Re: A juvenile Ilbia mariana ?
    From: Clay Carlson, April 3, 2006
  3. A juvenile Ilbia mariana ?
    From: Yukari Tani, April 3, 2006
  4. llbia mariana from Northern Mariana Islands
    From: Takao Uraswa, April 1, 2006
  5. Ilbia mariana from the Marshall Islands
    From: Scott Johnson, December 3, 2001
  6. 'runcinid' from Sulawesi, Indonesia
    From: Lindsay Warren, March 23, 1999
  7. Sulawesi runcinid is Ilbia mariana
    From: Clay Carlson, March 23, 1999

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