Abstract
The minute valvatiform-shelled Hydrobiidae are less studied than other hydrobiid gastropods. In this paper, new data on these snails are presented, which have been collected at twelve springs in southern Greece: one in Boeotia, one on Evvoia Island, and ten on the Peloponnese Peninsula. Mitochondrial cytochrome oxidase subunit I (COI) and nuclear histone (H3) have been used to confirm the determinations and infer the relationships of the studied gastropods. They represent the genera Daphniola, Graecoarganiella and Isimerope. New localities, expanding the known geographic ranges, have been presented for Daphniolahadei and Daphniolalouisi. A species of Daphniola found at two localities has been identified as a species new to science, and its description, including the shell, penis, and female reproductive organs is given. Possible relationships between Graecoarganiella and Isimerope are discussed; their representatives are possibly new species. At one locality a single specimen likely represents a new genus: it was found to be most closely related with Islamia, but genetically (p-distance) too distant to be congeneric with Islamia.
Highlights
Minute freshwater gastropods with depressed trochiform shells often were classified as belonging to the family Valvatidae Gray, 1840
The first genus described for such hydrobiid snails was Horatia Bourguignat, 1887 from Dalmatia (Schütt 1961; Radoman 1965; Szarowska and Falniowski 2014)
We present the valvatiform-shelled gastropods collected at 12 localities in southern Greece
Summary
Minute freshwater gastropods with depressed trochiform (valvatiform) shells often were classified as belonging to the family Valvatidae Gray, 1840. The first genus described for such hydrobiid snails was Horatia Bourguignat, 1887 from Dalmatia (Schütt 1961; Radoman 1965; Szarowska and Falniowski 2014). Hydrobiidae in Greece are still poorly studied, and their microhabitats have drastically disappeared (Szarowska and Falniowski 2011a). The poor knowledge is perhaps of more concern for the valvatiform-shelled hydrobiids, since their low-spired tiny shells are overlooked or treated as juveniles. For example Schütt (1980), have expanded the ranges of the Central European and North Balkan genera towards Greece, which was criticized by for example, Radoman (1983, 1985). We present the valvatiform-shelled gastropods collected at 12 localities in southern Greece
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