Bythiospeum copiosus ( Angelov, 1972 )

Georgiev, Dilian, 2011, New localities of four Bulgarian endemic Hydrobiidae species (Mollusca: Gastropoda: Risooidea), ZooNotes 2011 (16), pp. 1-4 : 3

Bythiospeum copiosus ( Angelov, 1972)

Distribution in Bulgaria: Known only from its type locality, the Izvora cave near Polaten, Teteven district, Stara Planina Mts. ( Angelov 1972).

Material examined: 2 shells, 03.12.2010, Glava Panega spring, near village of Zlatna Panega, Stara Planina Mts. , North Bulgaria, UTM KH67, D. Georgiev leg.

Diagnosis: The shell is conical, the whorls are 4 ½ - 5, the aperture has not well developed lip which discerns this species from B. bureschi which shell is more cylindrical, has 4 ½ - 5 ½ whorls and its aperture has well developed lip ( Fig 1 , 3 ).

Discussion: Firstly this species was described as a subspecies of B. bureschi as Paladilhiopsis bureschi copiosus Angelov, 1972 . The genus Paladilhiopsis Pavlović, 1913 is considering Boeters (1998), a synonym of Bythiospeum Bourguignat. Both B. copiosus and B. bureschi stat. nov. have quite different shell morphology and their localities are very far from each other so we consider B. copiosus as a separate species.

Figures

Fig. 1. Shells of the stygobite snails of the Temnata Dupka cave (Lakatnik): 1 – the newly recorded Belgrandiella pussila, 2 – Belgrandiella hessei, 3 – Bythiospeum bureschi. The shells are displayed in respective proportions.

Fig. 3. Bythiospeum copiosus from Glava Panega spring, front (left) and back (right) side view of the shell.