Pseudobiceros periculosus  Newman and Cannon 1994

Version française...

This species has been observed on Reunion and Mayotte Islands

Order : Polycladida
Suborder : Cotylea
Superfamily : Pseudocerotoidea
Family : Pseudocerotidae
Distribution : Pacific and now Reunion
Maximal size : 45 mm
Abundance :

Species characteristics :

Background body colour black with wide bright orange band and narrow clear rim

Pseudotentacles black, square, orange laterally

Pseudobiceros periculosus
Showing species characteristics...

Photo Hugues Flodrops
Reunion, Etang salé on the rocky coast, less 1 m, 9 December 2010, size : 25 mm

Bibliographic data :

Habitat : Found under rubble on the reef crest feeding on orange colonial ascidians
    Ethymology : periculosus = danger, for its black and orange pattern
    This species looks like Pseudobiceros uniarborensis, Pseudobiceros hymanae, Pseudobiceros hancockanus and Pseudoceros periaurantus but
            - In Pseudobiceros hancockanus, there is two distinct marginal bands, the inner band is wide and orange, and the rim is narrow and white
            - In Pseudobiceros hymanae , there is a wide orange marginal band and a narrow black rim
            - In Pseudoceros periaurantus, there is only a distinctive wide brilliant orange marginal band
            - In Pseudobiceros uniarborensis there is three narrow marginal bands, inner band bright orange, then a wide clear or grey band and a white rim

References :

Discover life : Pseudobiceros periculosus

Publications :

Newman, L.J. & Cannon, L.R.G. (1994). Biodiversity of Australian polyclad flatworms. Memoirs of the Queensland Museum 36: 159163
    Newman, L.J. & Cannon, L.R.G. (2003). Marine Flatworms: the world of Polyclads. CSIRO Publishing : Melbourne 112 p
    Poulter, J.L. (1987). Phylum Platyhelminthes. Chapter 1, Section 2 & 3. pp. 1358 in Devaney, D.M. & Eldredge, L.C. (eds) Reef and Shore Fauna of Hawaii . Bishop Museum Press : Hawaii

Other photos of Pseudobiceros periculosus :




Philibert Bidgrain

Reunion, Grand Fond lagoon, Saint Gilles, less 1 m, 23 September 2010, size : 12-15 mm

Detail of the pseudotentacles



Pseudotentacles black, square, orange laterally (a)




Christophe Cadet

Reunion, La Saline lagoon, less 1 m, 18 April 2010, size : 45 mm



Eva Fontaine

Reunion, Grand Fond lagoon, Saint Gilles, less 1 m, 20 December 2009, size : 10 mm

A juvenile form of this species ???



Philibert Bidgrain

Reunion, La Saline lagoon, less 1 m, 17 February 2010, size : 15-20 mm

A specimen with a bright orange marginal coloration (a) and narrow clear rim (b)



 More photos from Indian Ocean

Mayotte, Pseudobiceros periculosus, at Petite terre, by Matthias Deuss