Thysanozoon cf nigropapillosum   Hyman, 1959

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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 : 50 mm
Abundance :

Species characteristics :

Background body colour velvety black

Dorsal papillae short, tipped with yellow-orange, without pointed tips and ending prior to the margin

Marginal band white

Thysanozoon cf nigropapillosum
Showing species characteristics...

Photo Sophie Darnis
Reunion, Site des Douanes, Le Port, 12 m, 28 January 2007, size : 35 mm

See more about : Thysanozoon cf nigropapillosum variability in Southwest Indian ocean

Remarks :

For some specialists this kind of specimens correponded to Thysanozoon nigropapillosum
   Leslie Newman (2003) considered that this kind of specimens are incorrectly known as Thysanozoon nigropapillosus (Hyman, 1959) which was first described as black with white papillae and a yellow marginal band. So she called these specimens Thysanozoon sp1
Hyman description (1959) :
            - It is black with a pale yellowish border.
            - The dorsal surface is covered with low rounded black papillae tipped with white, hence to the naked eye the dorsal surface appears black dotted with white

Bibliographic data :

Pseudotentacles square

References :

Discover life : Thysanozoon nigropapillosum
   Marine flatworms of the world : Thysanozoon nigropapillosum
   Nudipixel : Thysanozoon sp

Publications :

Faubel, (1984) : The Polycladida, Turbellaria. Proposal and establishment of a new system. Part II. The Cotylea . Mitteilungen des hamburgischen zoologischen Museums und Instituts 80. 189259.
    Hyman, L.H. (1959). A further study of Micronesian polyclad flatworms. Proceedings of the United States National Museum 108: 543597
    Newman, L.J. & Cannon, L.R.G. (2003). Marine Flatworms: the world of Polyclads. CSIRO Publishing : Melbourne 112 p

Other photos of Thysanozoon cf nigropapillosum :

Christophe Cadet

Reunion, Etang salé, 13 m, 18 November 2008, size : 45 mm

Dorsal papillae short, tipped with yellow-orange (a) , without pointed tips and ending prior to the margin



Marina Poddubetskaia

Mayotte, "Passe Bandrélé", 8 m, 11 November 2003, size : 15 mm

A juvenile form...



Matthias Deuss

Mayotte, 18 July 2009

Flatworms of this genus have a papillate dorsal surface and a very ruffled margin.


Yvon Gildas

Mayotte, 30 August 2008

In this specimem the dorsal papillae appeared pale yellow nearly whitish...


Philibert Bidgrain

Réunion, Trou d'eau, less 1 m, 23 October 2010, size : 35-40 mm

Crawling during the day on the substrate...

Alain-Benoît Rassat

Madagascar, Nosy bé, 20 m, September

According Alain-Benoît Rassat " Probably the most commun flatworm of Nosy bé..."

Swimming on the sea...

Philippe Bourjon

Réunion, less 1 m, La Saline, February 2016

Underside of the animal...

 More photos from Indian Ocean

See more about : Thysanozoon cf nigropapillosum variability in Southwest Indian ocean

 Mayotte, Thysanozoon cf nigropapillosum, at Passe en S, by Florence Trentin

Mauritius, Thysanozoon cf nigropapillosum, at Flic-en-flac, by Pierre Conchylinet