Dugesia sagitta

Dugesia sagitta is a species of dugesiid triclad that inhabits the rivers of Corfu, Greece. The specimens of this species are up to long and wide.
In 1925 Komarek synonymized "Dugesia sagitta" (then "Planaria sagitta") with "D. gonocephala", because the morphological description given by Schmidt when the species was named in 1861 was not accurated. In 1984 "D. sagitta" was back from the synonymization thanks to the contribution of a more accurated morphological description done by de Vries. In 1861 Schmidt also described "D. sagitta" from Cephalonia, but de Vries demonstrated that it was actually "D. aenigma".
The type locality of this species is Messonghi river, Corfu, Greece.
Karyology.
This "Dugesia" species, from what only sexual reproducing specimens are known, have a karyoptype of 2n=16, constituted only by acrocentric chromosomes.