Thuridilla moebii (Bergh, 1888)

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This species has been observed on Reunion Mauritiu, Mayotte and Madagascar Islands


Order : Sacoglossa
Superfamily : Plakobranchoidea
Family : Plakobranchidae
Distribution : Indian Ocean. Mauritius, Reunion Is, Comoro Ids, South Africa, Houtman Abrolhos Ids (Western Australia).
Maximal size : 20 mm
Abundance : Frequently on the fore reef zone and on the reef flat zone


Species characteristics :

The body is translucent white, often with a tinge of bluish green
   There is a broad brown-black band, scattered with numerous opaque white spots, along the wavy edge of the parapodia
   The rhinophores and the anterior margin of the foot are also brown-black with white spots.

Thuridilla moebii
Showing species characteristics...

Photo Philibert Bidgrain
Reunion, La Saline, less 1 m, 13 February 2010, size : 18 mm

See more about : Sightening and mating periods
   See more about : Thuridilla phylogeny by Gosliner 1995
   See more about : Thuridilla moebii variability in Southwest Indian ocean
   See more about : Thuridilla moebii mating behavior and spawn event in Southwest Indian ocean
   See more about : Thuridilla moebii "hanging out" an ostracod...

Remarks :

Identification confirmed by Bill Rudman and Hsini Lin
    Gosliner (1995) : "At the margin of the parapodia is an burnt orange longitudinal band. Below this band is a black band. Both bands are covered with minute opaque white spots ". Usualy, in specimens observed at Mayotte and Reunion, it appears that there is a single black-brown band nearly homogeneous, but in some specimen the colour of the parapodial margin consisting of an outer black and an inner burnt orange band...
    Synonymous : (according Worms)
               - Elysia moebii (Bergh, 1888)                        - Plakobranchus moebii Bergh, 1888

Bibliographic data :

The intensity of the bluish-green may depend on the concentration of algal material in the digestive gland ducts, but too few animals have been reported to be sure.
    The head is the same colour as the rest of the body
    One specimen of this species was collected from Reunion Island by Michael Gosliner and Gary Williams.

References :

Bill Rudman Seaslug site : Sea Slug Forum : Thuridilla moebii
   Nudipixel Thuridilla moebii

Publications :

Gosliner, T.M. (1995) The genus Thuridilla (Opisthobranchia: Elysiidae) from the tropical Indo-Pacific, with a revision of ther phylogeny and systematics of the Elysiidae. Proceedings of the California Academy of Sciences, 49(1) : 1-54.
    Jensen, K.R. (2007). Biogeography of the Sacoglossa (Mollusca, Opisthobranchia). Bonner Zoologische Beiträge. 55: 255281.

Other photos of Thuridilla moebii :


Barbara Bini

Madagascar, Nosy bé, 18 m, 15 mm

 


Olivier Aubrespine

Reunion, Saint Leu lagoon, less 1 m, 24 January 2005, size : 15-20 mm

The classical form of this species with a single black-brown band nearly homogeneous

 


Delphine Dupin

Reunion, Saint Leu, 10 October 2004

Two specimens were observed during the same dive.


thuridilla moebii

Philibert Bidgrain

Reunion, La Saline lagoon, less 1 m, 10 April 2010, size : 12-15 mm

In this specimen the colour of the parapodial margin consisting of an outer black (a) and an inner burnt orange (b) band...

 


Emmanuel Eby Reunion, Saint Leu, 4 August 2004

Size :10 mm

In the lower photo , we clearly see the bluish-gren coloration

Green coloration

Thuridilla moebii E.Eby


Philibert Bidgrain

Reunion, Trou d'eau lagoon, less 1 m, 25 August 2010, size : 4-6 mm

In this small specimen the parapodial margin is completely burnt orange, and the rhinophores are always black...

 

 


 

 

Nathalie Rodrigues

Réunion, Cap la Houssaye, 5 may 2015

with vivid coloration ...

 

 

Thuridilla moebii : E.Eby


 More photos from Indian Ocean

See more about : Thuridilla phylogeny by Gosliner 1995

See more about : Thuridilla moebii variability in Southwest Indian ocean

See more about : Thuridilla moebii mating behavior and spawn event in Southwest Indian ocean

See more about : Thuridilla moebii "hanging out" an ostracod...

Reunion,Thuridilla moebii, at Cap la Houssaye, by David Caron

Reunion, Thuridilla moebii in a lagoon, at Saint Gilles, by Sonia Ribes-Beaudemoulin

Mayotte, large population of Thuridilla moebii, at mtsanga Fanou, by Philibert Bidgrain 

Mayotte, Thuridilla moebii, by Sylvain Le Bris

Mayotte, Thuridilla moebii with burnt orange inner marging coloration, at Tanaraki, by Philibert Bidgrain  

Mauritius, Thuridilla moebii, by Jamie Mcnab