Pleurobranchus albiguttatus (Bergh, 1905)

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This species has been observed on Reunion and Mayotte Islands


Order : Pleurobranchomorpha
Superfamily : Pleurobranchoidea
Family : Pleurobranchidae
Distribution : Indo-West Pacific
Maximal size : 70 mm
Abundance : From time to time on the rocky coast


Species characteristics :

It is easily recognised by the regularly arranged triangular white marks on the inside of dark brown tubercles. The tip of the white triangles point towards the mantle edge. This shading gives the spots the appearance of raised white pointed papillae.

Colouration varies from orange to brown and the mantle is mottled with cream

Pleurobranchus albiguttatus
Showing species characteristics...

Photo Philibert Bidgrain
Reunion, Etang salé on the rocky coast, less 1 m, 17 October 2005, size : 45-50 mm

See more about : Sightening and mating periods
   See more about : Pleurobranchus albiguttatus variability in Southwest Indian ocean

Remarks :

Identification confirmed by Bill Rudman and Nathalie Yonow
    Synonymous : (according Worms)           
               - Oscaniella albiguttata Bergh, 1905    

Bibliographic data :

There is an intense white elongate patch at the posterior end of the sole of the foot. This is a gland which develops in most species of Pleurobranchus as they reach maturity.
    The foot is spotted with orange or brown
    It looks quite like P. peroni but the larger dark brown tubercles with a white line down one side are a unique feature found only in P. albiguttatus
    It feeds on the compound ascidian at night, individuals are generally found hiding during the day
    It lays a white spirally-arranged egg mass with one edge atached to the substrate and the other very wavy

References :

Bill Rudman Seaslug site : Sea Slug Forum : Pleurobranchus albiguttatus
   Nudipixel Pleurobranchus albiguttatus

Publications :

Bergh, L.S.R., (1905). Die Opisthobranchiata. Siboga Expeditie Report, 50 : 248pp., Pls 1-20.
    Goodheart J., Camacho-García Y., Padula V., Schrödl M., Cervera J.L., Gosliner T.M. & Valdés Á. (2015). Systematics and biogeography of Pleurobranchus Cuvier, 1804, sea slugs (Heterobranchia: Nudipleura: Pleurobranchidae). Zoological Journal of the Linnean Society. 174: 322-362.

Other photos of Pleurobranchus albiguttatus :


Philibert Bidgrain

Reunion, Etang salé on the rocky coast, less 1 m, 7 November 2006, size : 12 mm

A juvenile form, size : 12 mm...

You can see the characteristic white triangles point towards the mantle edge and a thin orange mantle border.

Philibert Bidgrain

Reunion, Etang salé on the rocky coast, less 1 m, 7 December 2006, size : 20 mm

A juvenile form, size : 20 mm...

One month later, same place, may be same specimen....

You can see the characteristic white triangles point towards the mantle edge and a larger orange mantle border.


Hugues Flodrops

Reunion, Etang-Salé on the rocky coast, less 1 m, 1 December 2006, size 40 mm.

This form has a thin orange mantle border.

There is an intense white elongate patch at the posterior end of the sole of the foot. This is a gland which develops in most species of Pleurobranchus as they reach maturity. The foot is spotted with orange or brown


 

Philibert Bidgrain

Reunion, Saint Pierre harbourg, 1 m, 8 December 2006, size: 20 mm.

A small specimen with an orange coloration

 


Maurice Jay

Reunion, "Cap la Houssaye" at Saint Paul, 8 m, 25 December 1990, size : 35 mm

A "red coloration" for this specimen

 

 


 

Maurice Jay

Reunion, Size : 24 mm

A pale brown coloration

 


 

 

Marina Poddubetskaia

"Banc Laclochèterie", Handrema, Mayotte, 5m, 11 November 2003, size : 25 mm

A pale brown coloration

It is easily recognised by the regularly arranged triangular white marks on the inside of dark brown tubercles.


Olivier Police

Mayotte, M'tsangamouji, Amboto plage, 2 m, 26 June 2011, size : 50 mm

The foot is spotted with orange or brown (a)


Philibert Bidgrain

Mayotte, M'Titi Sada, less 1 m, 18 July 2010, size: 15 mm.

A small specimen with an yellow/orange coloration


 

Christophe Cadet

Réunion, Etang salé, onn the rocky coast, less 1 m, 14 December 2011

Tree spawns observed on this spot

It lays a white spirally-arranged egg mass with one edge atached to the substrate and the other very wavy


Philibert Bidgrain

Mayotte, Petite Terre, Le Rocher, less 1 m, 16 April 2014, size : 15 mm

It is easily recognised by the regularly arranged triangular white marks on the inside of tubercles.

A specimen with a very little among of triangular white marks.


 More photos from Indian Ocean

See more about : Pleurobranchus albiguttatus variability in Southwest Indian ocean

Reunion, juvenile form of Pleurobranchus albiguttatus, at Etang salé, by Christophe Cadet