Parasitic turbellaria in Holothuria tubulosa, Holothuria forskali and Cucumaria planci in the northern Adriatic Sea

The infestation by parasitic turbellaria of the coelom and the intestine of Holothuria forskali, Holothuria tubulosa and Cucumaria planci was investigated. Animals were collected by dredging in the bay of Rovinj (northern Adriatic Sea, Croatia). H. tubulosa, the only resident species in shallow water in Val Saline 4 km north of Rovinj was collected by snorkelling.