Favorinus cf mirabilis    Baba, 1955
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This species has been observed on Reunion, Mayotte, Mauritius and Madagascar


Order : Nudibranchia
Suborder : Dexiarchia
Superfamily : Aeolidioidea
Family : Facelinidae
Distribution : Okinawa, Papua new Guinea, Indonesie and south west of indian ocean
Maximal size : 25 mm
Abundance : Seldom on the fore reef zone and the rocky coast


Species characteristics :

The oral tentacles, the body and the cerata are translucent orange, only the tips of the cerata are white to pale orange

The perfoliate rhinophore are dark violet to purple brown

Favorinus cf mirabilis
Showing species characteristics...

Photo Monika Bachel
Reunion, "Cap La Houssaye", Saint Paul, 8 m, 14 January 2009, size : 20-25 mm

See more about : Sightening and mating periods

Remarks :

Identification confirmed by Hsini Lin and Bill Rudman
   This species could be a new species or an undescribed color variation of Favorinus mirabilis with orange coloration

Bibliographic data :

They have yellow-orange digestive gland ducts in the cerata
    The anterior foot corners are prominent, being enlarged into long large tentacles
    There is similarities with Favorinus tsuruganus but in F. tsuruganus the body and the oral tentacles are opaque white and there is a black tip to the cerata. Also the rhinophores have numerous leaflets, rather than the three "cup-shaped swellings" found in F. tsuruganus

References :

Bill Rudman Seaslug site : Sea Slug Forum : Favorinus cf mirabilis

Publications :

Baba, K. (1955) Opisthobranchia of Sagami Bay. Supplement . Iwanami Shoten, Tokyo

Other photos of Favorinus cf mirabilis :


Monika Bachel

Reunion, "Cap La Houssaye", Saint Paul, 8 m, 14 January 2009, size : 20-25 mm

3 specimens on an Hexabranchus sanguineus mass egg

(a) The perfoliate rhinophore

(b) They have yellow-orange digestive gland ducts in the cerata

(c) The anterior foot corners are prominent, being enlarged into long large tentacles

 


Marina Poddubetskaia

Mayotte, Choizil, 19 m, 14 November 2003,

Favorinus cf mirabilis and Favorinus mirabilis on the same egg masse of Hexabranchus sanguineus

One of the specimen found in this mass egg


Size : 22-25mm


Marina Poddubetskaia

Mauritius, "Malen", Pereybère, 18 m, 18 October 2002, size 15 mm

According Bill Rudman " This photo clearly shows the dark reddish spot near the tip of each cerata, which is characteristic of Favorinus mirabilis. One vote in favour of it being considered just a colour variation of that speces"


 More photos from Indian Ocean

 Reunion, six Favorinus cf mirabilis in a spawn of Hexabranchus, at Gilles, by Philibert Bidgrain

Mauritius, Favorinus cf mirabilis, at Trou aux biches, by Richard Lai cheong 

Madagascar, a small group of Favorinus cf mirabilis crawling on Halimeda sp, at Nosy Be, by Sully Bachel  

Reunion, 3 Favorinus cf mirabilis get lost on the substrate, at La Possession, by Erwan Meyer

Madagascar, head detail of Favorinus cf mirabilis, at Nosy Bé, by Alain-Benoît Rassat