Two new hymenolepidid species (Cestoda, Hymenolepididae) from water shrews Neomys fodiens Pennant (Insectivora, Soricidae) in Bulgaria

摘要

Two new hymenolepidid species, Coronacanthus magnihaniatus sp. nov. and Triodontolepis boyanensis sp. nov. are described from the European water shrew, Neomys fodiens, in Bulgaria. The most important differentiating features of C. litagnihainatits are the length of the rostellar hooks (26-28 mu m, mean 27 mu m) and the thick-walled uterus, which does not form capsules in gravid proglottids. T boyanensis is distinguished from other members in the genus by the number (16) and size (47-48 mu m, mean 48 mu m) of the rostellar hooks, the non-capsulate gravid uterus, containing relatively large number of eggs (35-70, mean 49) and the embryophore, possessing polar filaments. The types of uterine development in hymenolepidids of Neonn's spp. are discussed.