Daphniola dionesp. nov., a valvatiform hydrobiid gastropod from Western Greece, is described based on conchological, anatomical and molecular data. D. dione is distinguished from the other species of the Greek endemic genus Daphniola by a unique combination of shell and soft body character states and by a 7–13% COI sequence divergence when compared to congeneric species. The only population of D. dione inhabits a cave spring on Lefkada Island, Ionian Sea.
Islamia trichoniana Radoman, Pseudoislamia balcanica Radoman and Trichonia trichonica Radoman are local endemics and threatened hydrobiids living in Lake Trichonis, Western Greece. The rough initial description of their reproductive organs (i.e. penis, bursa copulatrix and receptacula seminis) is supplemented with new data. The radulae of I. trichoniana and P. balcanica are described in detail for the first time. New records of the three species are given and preliminary data about their feeding regime are provided.
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