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.
<em>Sardulus sacerensis</em> Casale & Marcia, nuova specie di <em>Histeridae</em> <em>ipogei</em> della Grotta di Lu Gardu (Sassari, Sardegna nord-occidentale) è descritta e comparata con le due specie note in precedenza della Sardegna centro-orientale, <em>S. spelaeus</em> Patrizi, 1955, e<em> S. incrassatus</em> Magrini & Fancello, 2005. Le caratteristiche morfologiche esterne<br />e i genitali maschili delle tre specie sono raffigurati. Inoltre, è fornita per la prima volta la descrizione della morfologia larvale di una specie di questo genere. <em>S. spelaeus,</em> specie nota fino ad ora di due grotte in territorio di Dorgali, è segnalata di una terza località: la Grotta di Istirzili o Stirzili, nel territorio di Baunei.
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