Aldisa sp. 2.
Order: NUDIBRANCHIA
Suborder: DORIDINA
Superfamily: EUDORIDOIDEA
Family: Dorididae
PHOTO
at Heron Island, Great Barrier Reef, Queensland, Australia, 30 mm long, September 1994. PHOTO: Julie Marshall.
The major characteristics of this species are the regularly spaced low pustules on the dorsum, each of which has a black centre, and the two large pits, one behind the rhinophores and the other immediately in front of the gills (see enlargement). It also has two transverse lines of white speckles, sometimes fused, between the rhinophores and gills and these lines vary in their intensity between individuals.
In colour this species resembles both Aldisa sanguinea and A. pikokai but both these species are a paler red and neither species has pustules with black centres.
See message below.
Authorship detailsMarshall, J., 1999 (October 19) Aldisa sp. 2. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/aldisp2
Related messages
Aldisa from Reunion
December 4, 2003
From: Yves Coze
Dear Bill,
Here is another small nudibranch I spotted a long time ago. I wondered if perhaps it was a juvenile Phyllidiopsis cardinalis. It was spotted in Reunion Island, Indian Ocean, at Petit Tombant, Etang Salé at a depth of approx 15 m on a sandy patch near a coral reef).
Thank's in advance
Yves Coze
info@rando-reunion.com
Coze, Y, 2003 (Dec 4) Aldisa from Reunion. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11600Dear Yves,
This is an interesting find. It is a species of Aldisa but not one I instantly recognise. The closest I can find is the one from the Great Barrier Reef which is on the Forum as Aldisa sp. 2. It seems to differ from other reddish species of the genus in having rounded tubercles on the mantle.
Best wishes
Bill Rudman
Aldisa sp. 2 from Heron Island
October 20, 1999
From: Julie Marshall
Dear Bill,
These are pictures of an Aldisa species found in September 1994 at Heron Island. It was 30 mm in size but other animals found over the years during the months from August to January varied from 20 mm to 40 mm. The major characteristics of this species are the regularly spaced low pustules on the dorsum, each of which has a black centre, and the two large pits, one behind the rhinophores and the other immediately in front of the gills (see enlargement). It also has two transverse lines of white speckles, sometimes fused, between the rhinophores and gills and these lines vary in their intensity between individuals. All animals have been found at low tide at the reef crest under dead coral slabs, usually singly or in pairs, but on one occasion (October 1990) six animals were found together. It lays a pale red spawn mass.
In colour this species resembles both Aldisa sanguinea and A. pikokai but both these species are a paler red and neither species has pustules with black centres.
Best wishes
Julie Marshall
j.marshall@latrobe.edu.au
Marshall, J., 1999 (Oct 20) Aldisa sp. 2 from Heron Island. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1443Dear Julie,
Thanks for the photos. Aldisa seems to be one dorid genus which is fairly easy to identify externally. The generally red colour and the sponge-like pits on the mantle, seem to characterise most, if not all species.
Bill Rudman.
