The paper is dedicated to the memory of jozef šTeffek , the famous Slovak malacozoologist who died suddenly during the implementation of this study. The first series of the samples was determined by him.
We studied the shell and penis morphology, and cytochrome oxidase subunit I (COI) gene sequences, in minute, valvatiform hydrobiid gastropods from Slovensky Kras, Slovakia. The morphology confirmed the assignment of the studied snails to the genus Hauffenia, while in the molecular tree they were placed within the Hydrobiidae, and not close to Hauffenia. The results indicate that the Slovak valvatiform hydrobiids are two taxa which presumably represent two genera: Hauffenia Pollonera, 1898 and Lobaumia Haase, 1993. More molecular data on the Austrian and Hungarian taxa are needed.
The shell, radula, penis and female reproductive organs of Alzoniella slovenica (Lozek et Brtek, 1964), from Slovakia, are described. The morphology of A. slovenica resembles the literature description of A. hartwigschuetti Reischütz, 1983 from Austria, and is less similar to three Alzoniella species from Italy. Sequences of cytochrome oxidase subunit I (COI) were used for phylogenetic reconstruction. The closest relatives of A. slovenica are Radomaniola and Anagastina, not the Italian Alzoniella finalina Giusti et Bodon, 1984. A. slovenica is not congeneric with A. finalina, in which case morphological characters are misleading.
The Ojców National Park malacofauna, although studied for more than a hundred years, is still insufficiently known. The paper deals with the malacofauna collected at four localities within the Ojców National Park. It comprises 73 species, out of which there are six new for the area. The authors give an ecological classification of the recorded species, the resulting check list of the malacofauna being compared with former data.
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