Abstract
Specimens of Bythinella cf. opaca were collected from a stream in Sredna Gora Mts. (West Bulgaria) on 24 Nov 2007 and 17 April 2008. The locality was situated west from village of Djulevo, close to Streltchenska Luda Yana River, UTM-grid: KH80, GPS coordinates: 42˚27'15.6" N, 24˚20'27.1" E, 393 m a.s.l. We determined the species considering the male genital system structure, but the shell morphology also was looked upon. It was the first record of such species in Bulgaria. After this report the Bulgarian Bythinella species rose to 3: B. austriaca, B. hansboetersi and B. cf. opaca. According to the fact that the species B. austriaca previously recorded in the country was not studied anatomically we consider its occurrence here as not proved.
Highlights
From Bulgaria, two species of Bythinella Moquin-Tanton 1855 were known till
The recorded specimens were determined on the base of shell morphology (ANGELOV 1960)
Shell morphology and dimensions (Fig. 3): Despite the shell morphology is not considered as a sure indicator for species identification, our shells were very similar to those of B. opaca published by JOVANOVICH (1991), GLÖER & PEŠIĆ (2006), and HAASE et al (2007)
Summary
The species Bythinella austriaca (Frauenfeld 1856) was reported from the mountains mainly in the west of the country (Western Rhodopes, Rila, Vitosha, Sredna Gora, and Stara Planina Mts.) (ANGELOV 1960, 2000). The recorded specimens were determined on the base of shell morphology (ANGELOV 1960). B. austriaca was reported and for Sarnena Gora Mts. by GEORGIEV (2005) but this record refers to a Belgrandiella Wagner 1927 – species. Considering the literature there is and another, relatively widely distributed species in south-east Europe – Bythinella opaca (GALLENSTEIN 1848) reported from the neighbouring Serbia (RADOMAN 1976) and Turkey (YILDRIM 2006) which occurrence in Bulgaria was expected. We report the first finding of specimens having similar shell morphology and male genital system in the country
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