Pseudobiceros uniarbonensis  Newman and Cannon 1994

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This species has been observed on Reunion, Mauritius, Mayotte and Madagascar Islands


Order : Polycladida
Suborder : Cotylea
Superfamily : Pseudocerotoidea
Family : Pseudocerotidae
Distribution : Indo West Pacific
Maximal size : 60 mm
Abundance :


Species characteristics :

Background colour varie from velvety black to translucent grey or brown with three narrow marginal bands ; inner band bright orange, then a wide clear or grey band and a white rim

Pseudotentacles ear-like pointed black with white tips

Pseudobiceros uniarborensis
Showing species characteristics...

Photo Philibert Bidgrain
Reunion, La Saline lagoon, less 1 m, 24 April 2010, size : 30-35 mm

See more about : Pseudobiceros uniarborensis variability in Southwest Indian ocean

Bibliographic data :

P. uniarborensis is originally described as opaque black with three extremely narrow marginal bands. However, this species now appears to show a range of colour patterns ; black with irregular white spot (Western Australia), or semi-transparent brown, semi-transparent brown with irregular white spots (PNG Madang)
      The specimen illustrated in Gosliner & all (1996) from the Philippines shows an extreme colour variation where the dorsal surface is semi-transparent and light brown
      All these animals belong to P. uniarborensis since the marginal banding remains the same
   Presence of a grey-white triangle between pseudotentacles
   Habitat : Found under rubble on the reef crest and slope
   Ethymology : uni = one ; arborensis = place of the tree in honour to One Tree Island
   This species looks like Pseudobiceros hancockanus, Pseudoceros periaurantus and P. periculosus but
            - In P. hancockanus, there is only two distinct marginal bands, the inner band is wide and orange, and the rim is narrow and white
            - In Pseudoceros periaurantus, there is only a distinctive wide brilliant orange marginal band
            - In P. periculosus there is a wide bright orange band and a narrow clear rim

References :

Discover life : Pseudobiceros uniarborensis
   Nudipixel : Pseudobiceros uniarborensis

Publications :

Newman, L.J. & Cannon, L.R.G. (1994). Pseudoceros and Pseudobiceros (Polycladida, Pseudocerotidae) from Eastern Australia and Papua New Guinea. Memoirs of the Queensland Museum 37: 205266
    Newman, L.J. & Cannon, L.R.G. (1997). Nine new Pseudobiceros (Platyhelminthes, Polycladida, Pseudocerotidae) from the Indo-Pacific. The Raffles Bulletin of Zoology 45: 341–368
    Newman, L.J. & Cannon, L.R.G. (2003). Marine Flatworms: the world of Polyclads. CSIRO Publishing : Melbourne 112 p

Other photos of Pseudobiceros uniarborensis :


 

 

 

Christophe Cadet

Reunion, Etang Salé on the rocky coast, less 1 m, 10 October 2009, size : 30 mm

A specimen black with irregular white spot (a) like Western Australia specimens.

 

 


Marina Poddubetskaia

Mauritius, "Grand Aquarium" at Pereybère, 10 m, 17 October 2002, size : 5-7 mm

A juvenile specimen

 


Philibert Bidgrain

Reunion, La Saline lagoon, less 1 m, 25 March 2010, size : 45 mm

Three narrow marginal bands ; inner band bright orange, then a wide clear or grey band (a) and a white rim


 

 

Philibert Bidgrain

Mayotte, Mtsanga M'Titi Sada, less 1 m, 20 Jully 2010, size : 40-45 mm

Pseudotentacles ear-like pointed black with white tips (a)

The dorsal cerebral eyes spot (b)

An extra-numerous white dot (c) on the black dorsal background


 

 

Philibert Bidgrain

Mayotte, Mtsanga M'Titi Sada, less 1 m, 28 Jully 2010, size : 35 mm

A specimen with numerous small white dots on the black background.


 

 

Philibert Bidgrain

Mayotte, Mtsanga M'Titi Sada, less 1 m, 6 Jully 2010

A specimen with a very faint orange marginal border


 

 

Alain-Benoît rassat

Madagascar, Olaf, Nosy bé, during the night, 14 m, 30 August 2013, size 100 mm

Background colour varie from velvety black to translucent grey or brown

A very large specimen with a pale brown coloration.


 More photos from Indian Ocean

See more about : Pseudobiceros uniarborensis variability in Southwest Indian ocean

 Mayotte, Pseudobiceros uniarborensis with egg mass visible by transparance, at Mtsanga Tsoha, by Philibert Bidgrain