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Dugesia sicula
''Dugesia sicula'' is a species of dugesiid triclad that lives in freshwater bodies of the Mediterranean Basin, where it is widely distributed. At least it has been reported from Sicily,〔 Elba and Mallorca,〔Benazzi, M. (1961): "Les planaires des ïles tyrrhéniennes et leur differenciation raciale, cytologique et génétique". ''Le peuplement des ïles mediterranéennes et le problème de l'insularité'', (ed. CNRS, Paris), pp. 103-112.〕 Eivissa,〔Ribas M., Pala M., Vacca R. A., Riutort M., Baguñà J. "Taxonomical status of the Western Mediterranean asexual populations of the Dugesia (D) gonocephala group: Morphological, Karyological and Biochemical data". ''Fortschr. Zool.'' 36: 129-137 (1988)〕 Sardinia,〔Stocchino et al., 2005 G.A. Stocchino, G. Corso, R. Manconi, S. Casu and M. Pala, "Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus", ''Journal of Natural History'' 39 (2005), pp. 1947–1960.〕 Algeria,〔Vries, E D. J. (1988). A synopsis of the nominal species of the subgenus Dugesia (Platyhelminthes: Tricladida: Paludicola) from Africa and Madagascar. Zoological Journal of the Linnean Society. 92, 345-382.〕 Tunisia,〔Charni, M., Harrath, A. H., Sluys, R., Tekaya, S., and Zghal, F. (2004). "The freshwater planarian Dugesia sicula Lepori, 1948 (Platyhelminthes, Tricladida) in Tunisia: ecology, karyology, and morphology". ''Hydrobiologia'' 517, 161-170.〕 Morocco〔Stocchino, G A., Manconi R., Corso G., Sluys R., Casu S., & Pala M., 2009. "African planarians: morphology and karyology of Dugesia maghrebiana sp. n. (Platyhelminthes, Tricladida) from Tunisia". ''Italian Journal of Zoology''; 76(1): 83-91〕 and Crete.〔De Vries, EJ, 1988. "On the identity and occurrence of Dugesia sicula and D. biblica (Platyhelminthes, Tricladida, Paludicola) in the Mediterranean region". ''Fortschritte der Zoologie'' 36: 405–411.〕
==Morphology==
''D. sicula'' individuals have an asymmetrical penis papilla, with a diaphragm at the base, separating the seminal vesicle from the ejacultory duct. This duct is ventral and it opens subterminally. The seminal vesicle is wrapped by a thin layer of bulbar muscles. The penis papilla is weakly muscular and more parenchymatic.〔
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