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The paper provides the first detailed account on the taxonomic richness of the subterranean freshwater triclads from Sardinia, including the description of four new species for the genera Dendrocoelum and Phagocata. New records for Dugesia benazzii, Dugesia sp., Crenobia alpina, and Phagocata sp. are also reported. The three new species of Dendrocoelum are the first reported for the island of Sardinia. These species display a bursal canal sphincter and a large adenodactyl with a characteristic anatomy with a zone of fine circular muscle fibers running through the mesenchyme of its papilla. A detailed analysis of the structure of the penial flagellum in the genus Dendrocoelum highlighted six main conditions, some of which have not been previously reported, in regard to the histology of the tip of the penis papilla and the extent of its inversion. The new species of Phagocata represents the first species recorded from Italy and the first anophtalmous species reported from Europe.

journal of caves and karst studies/journal of cave and karst studies

Subterranean Aquatic Planarians of Sardinia, with a Discussion on the Penial Flagellum and the Bursal Canal Sphincter in the Genus Dendrocoelum (Platyhelminthes, Tricladida, Dendrocoelidae)