This species has been observed on Reunion and Mayotte Islands
Species characteristics :
Superfamily : Haminoeidea
Distribution : Indo-West Pacific
Maximal size (shell) :
The shell is sculptured all over with finely incised spiral lines except for the centre which is smooth
The shell is transparent white and the head shield and short parapodia have numerous microscopic brown dots
Pink large spots show through the transparent shell which increase in prominence with age
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Photo Nathalie Rodrigues
Reunion, Terre Sainte lagoon, less 1 m , December 2014
See more about : Sightening and mating periods
Identification proposed by Nathalie Yonow and Raymond Huet "Atys semistriata seems to me the same as Bulla succisa from "Vie océane" but the form is closer to Bulla than Atys.
If we follow
Worms, Bulla succisa Ehrenberg, 1831
is a dubious species
(taxon inquirendum) and could be Atys semistriata.
The spelling of the specific name has to be semistriatus (and not semistriata) to agree with the generic name Atys which has been deemed to the masculine
Synonymous (according worms):
- Atys semistriata fordinsulae Pilsbry, 1921
- Atys semistriata mua Pilsbry, 1921
Bibliographic data :
Various degrees of brown specking can be found on the headshield and parapodia.
The parapodia are very thin and only their anterior sections wrap over the front on the shell
The tail is large and rounded posteriorly
All species of Atys are herbivores.
It is most commonly found at night on algae covered material. During the day they can be occasionally found under rocks or coral rubble
When the population is high, mating aggregations with copulating pairs can often be seen on top of coral rubble or rocks at night. It lays a spherical, white to pale pink egg mass that is usually anchored in algal turf in the field.
Mollusques de l'île de la Réunion. Collection Jay: Bulla succisa
Sea Slug Forum Atys semistriata
Sea Slug of Hawai'i Atys semistriatus
Pease, W.H. (1860) Descriptions of new species of mollusca from the Sandwich Islands. Proceedings of the Zoological Society of London, 28 : 18-36.
Marshall, J.G. & Willan, R.C. 1999. Nudibranchs of Heron Island, Great Barrier Reef - A Survey of the Opisthobranchia (Sea Slugs) of Heron and Wistari Reefs. Backhuys Publishers Leiden
Other photos of Atys semistriatus :
Mayotte, Sakouli, during the night, less 1 m, 30 November 2017
Réunion, Shell ref : 298 Collection Maurice Jay
Light and semitranslucent. Ovoid narrowed posteriorly, narrow aperture posteriorly enlarged. The last turn overlooking the turn. Fine spiral furrows on the anterior and posterior thirds, respecting the median part. Less slender silhouette than Atys cylindrica.
Live in the sand from 10 to 70 m. Common enough.
Maximum height 9.9 mm.
Réunion, Etang Salé on the rocky coast, less 1 m, 24 November 2015, size : 2 mm
More photos from Indian Ocean
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