''Callioplana marginata'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

flatworm The flatworms, flat worms, Platyhelminthes, or platyhelminths (from the Greek πλατύ, ''platy'', meaning "flat" and ἕλμινς (root: ἑλμινθ-), ''helminth-'', meaning "worm") are a phylum of relatively simple bilaterian, unsegment ...

polyclads belonging to the

Callioplanidae ''Callioplanidae'' is a family of flatworms belonging to the order Polycladida The Polycladida represents a highly diverse clade of free-living marine flatworms. They are known from the littoral to the Sublittoral zone, sublittoral zone (exte ...

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

. ''Callioplana marginata'' is widespread throughout the

tropical The tropics are the regions of Earth surrounding the Equator. They are defined in latitude by the Tropic of Cancer in the Northern Hemisphere at N and the Tropic of Capricorn in the Southern Hemisphere at S. The tropics are also referred to ...

waters of the Indo/ West Pacific area. This

can reach a maximum size of 8 cm length . ''Callioplana marginata'' has a dark background color going from black, brown to grey with a two marginal bands: a fin white on the edge and a larger orange one. The main physical characteristic of thi species is the pair of non-retractile head tentacles, their body is orange with a white basal line.

References

* Stimpson, W. (1857). Prodromus descriptionis animalium evertebratorum quae in expeditione ad oceanum, pacificum septentrionalem a Republic Federata missa, Johanne Rogers Duce observavit et descripsit. Pars. I. Turbellaria Dendrocoela . Proceedings of the Academy of Natural Sciences of Philadelphia 9: 19–31

External links

* http://www.marinespecies.org/aphia.php?p=taxdetails&id=483600 * http://seaslugs.free.fr/flatworm/planaire/callioplana_marginata_a.htm * {{Taxonbar, from=Q2180345 Turbellaria