Pseudoceros imperatus Newman and Cannon, 1998

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This species has been observed on Reunion Island

Order : Polycladida
Suborder : Cotylea
Superfamily : Pseudocerotoidea
Family : Pseudocerotidae
Distribution : Indo Pacific
Maximal size : 15 mm
Abundance :

Species characteristics :

Background body colour brown, darker towards the margin, with cream to yellow-green prominent median stripe with transverse branches in yellow-green with white borders

Irregular yellow-green spots with white borders may be scattered around the median area

Margin wide orange extending across the pseudotentacles


Pseudoceros imperatus
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Photo Laurent Darey
Reunion, Tour de Boucan, 16 m, 6 November 2010, size : 30 mm

Remarks :

Leslie Newman think there's a real confusion between Pseudoceros zebra, P. scintillatus and P. imperatus. It is possible that they all form a single species. DNA studies needed to determine relationship between these " three species"
   For these three species, I separated the classic coloration pattern (according Newman, 2003) from ambiguous and unclassiable pattern, and I pull these under the name Pseudoceros scintillatus colour group

Bibliographic data :

Small pseudotentacles formed by simple folds of the anterior margin with few scattered pseudotentacular eyes. Small cerebral cluster with about 30 eyespots
   The ventral side is pink-cream in the middle and slightly brown laterally with an orange margin
   Habitat : Found on the reef crest under rubble
   Etymology : Named after the latin (masculine), imperatus = imperial; for its commanding and bold pattern

References :

Discover life : Pseudoceros imperatus
   Marine flatworms of the world : Pseudoceros imperatus
   Nudipixel : Pseudoceros imperatus
   Polycladia : Pseudoceros imperatus

Publications :

Newman, L.J. & Cannon, L.R.G. (1998). Pseudoceros (Platyhelminthes, Polycladida) from the Indo-Pacific with twelve new species from Australia and Papua New Guinea. The Raffles Bulletin of Zoology 46: 293323
    Newman, L.J. & Cannon, L.R.G. (2003). Marine Flatworms: the world of Polyclads. CSIRO Publishing : Melbourne 112

Other photos of Pseudoceros imperatus :



Laurent Darey

Reunion, Tour de Boucan, 16 m, 6 November 2010, size : 30 mm






Alain Diringer



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