Order : Nudibranchia
Suborder : Dexiarchia
Superfamily : Aeolidioidea
Family : Facelinidae
Distribution : Indo Pacific
Maximal size : 10 mm
Abundance : Seldom on the fore reef zone and the rocky coast

They have white speckling on the cerata wall, and a dark red or purple spot below the ceratal tip.

Presence of yellow oral tentacles and a yellow margin to the leading edge of the foot

The perfoliate rhinophore clubs range in colour from translucide white to dark brown

Presence of a pinkish-orange mlarking on head

Sometimes, there is a yellow to orange line down the midline of the head, between the rhinophores
    Feeds on egg masses of opistobranchs, specially Hexabranchus sanguineus
    Similar species : See Favorinus cf. mirabilis for an animal with orange cerata, and also feeds on Hexabranchus eggs.

Sully Bachel

Réunion, Cap la Houssaye, Saint Paul, 12m, 16 August 2008, size , 7 mm

Sometimes, there is a yellow to orange line down the midline of the head, between the rhinophores

Marina Poddubetskaia

Mayotte, Choizil, 19 m, 14 November 2003,

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

Sully Bachel

Réunion, Sec Jaune, Saint Leu, 30 m, 31 October 2009, size : 12-15 mm

Specimen found in a Hexabranchus sanguineus egg masses

Sully Bachel

Réunion, Ravine des Avirons, 17 m, 13 March 2010, size : 10-12mm

No orange coloration on the rhinophores in these two specimens

Sp 1 :

They have white speckling on the cerata wall and on the foot and a dark red or purple spot below the ceratal tip.

Sp 2 :

A colourless spécimen but always with the white speckling and the yellow to orange line down the midline of the head, between the rhinophores

Christophe Cadet

Réunion, Etang salé on the rocky coast, less 1 m, 14 November 2010

Specimen with a pinkish coloration

Nathalie Rodrigues

Mauritius, 17 m, 29 February 2016

Found in a Spanish dancer spawn...

Alain-Benoît Rassat

Madagascar, Nosy Bé, 15 m, size : 8 mm