Sohgenia palauensis  Hamatani, 1991

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This species has been observed on Mayotte and Madagascar Islands

Order : Sacoglossa
Superfamily : Limapontioidea
Family : Caliphyllidae
Distribution : Indo-West Pacific
Maximal size : 12 mm
Abundance : Seldom if ever...

Species characteristics :

Body (sometimes green) with encrusting white pigment behind the head and on the pericardium

Cerata bulbous wholly transparent with encrusting white pigment and reddish brown specks.

The rhinophores bifurcate into two arms right near the base, they are long, slender and simple The upper half of the rear branch is tinged slightly with brown.

sohgenia palaudensis
Showing species characteristics...

Photo Philibert Bidgrain
Mayotte, M'bouanatsa lagoon, less 1 m , 29 July 2010, size 3-4 mm

See more about : Sightening and mating periods

Remarks :

Identification confirmed by Nathalie Yonow
    Synonymous : (according Worms)
               - No other name

Bibliographic data :

General body colour is grass green due to presence of green pigments possibly derived from the animal's food.
    While specimens vary greatly in ground color, they all have encrusting white pigment behind the head and pericardium and on the bulbous cerata.
    No gut branches penetrate into the cerata
    It differs from species of Cyerce   Bergh, 1871 by the absence of oral tentacles
    Etymology. Hamatani (1991) chose the specific name in reference to the original collection site of the species, the Palau Islands

References :

Bill Rudman Seaslug site : Sea Slug Forum : Sohgenia palauensis
   Slug Site Sohgenai palauensis

Publications :

Hamatani,I (1991) Sohgenia palauensis n. gen . & sp., a new ascoglossan opisthobranch from the Palau Islands collected by the R/V Sohgen-Maru. The Venus, The Japanese Journal of Malacology, 50(2) : 85-92.

Other photos of Sohgenia palauensis :

Barbara Bini

Madagascar, Nosy bé, 26 m, 20 October 2017, size : 10 mm



Philibert Bidgrain

Mayotte, M'bouanatsa lagoon, less 1 m , 29 July 2010, size 3-4 mm


Two specimens observed...

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