Correspondence ISSN 2336-9744 (online) | ISSN 2337-0173 (print) The journal is available on line at www.ecol-mne.com

First record of tenuilineatum Stelfox, 1918 from Bulgaria

DILIAN GEORGIEV

Department of Ecology and Environmental Conservation, University of Plovdiv, Tzar Assen Str. 24, BG-4000 Plovdiv, Bulgaria. E-mail: [email protected]

Received 5 July 2015 │ Accepted 7 July 2015 │ Published online 8 July 2015.

The Pisidium tenuilineatum Stelfox, 1918 is one of the rarest pea clam species in Europe, distributed mainly in its central and eastern parts. It is extremely local everywhere, and is certainly declining (Welter-Schultes 2012). This species was never found in Bulgaria (Angelov 2000, Hubenov 2007) but was registered in the mainland of Greece (Bank 2006). In this short note I report the first find of Pisidium tenuilineatum in Bulgaria. Recent pea clam shells were collected by sieving river deposits of Bedechka River at Stara Zagora city (Upper Thracian Lowland, foothills of Sarnena Gora Mts.) on 30.12.2014. Species were determined mainly by Glöer & Meier-Brook (2003), Zettler & Glöer (2006), Glöer (2015), and a reference collection of shells. One fresh right valve of Pisidium tenuilineatum (L = 1.85 mm, H = 1.52 mm) was collected, N42 26 11.8 E25 38 26.9 (Fig. 1, 2). The material was deposited in the collection of the author.

Figure 1. Collection site of P. tenuilineatum in Bulgaria.

Ecol. Mont., 2 (4), 2015, 342-343 342

GEORGIEV

Figure 2. The shell of P. tenuilineatum collected at Bedechka River, Stara Zagora, Bulgaria. Scale bar = 1 mm.

Acknowledgments I am grateful to Peter Glöer (Hetlingen, Germany) for the reference collection of pea clams shells and the literature sources.

References

Angelov, A. (2000) (Gastropoda et ) aquae dulcis, catalogus Faunae Bulgaicae. Pensoft & Backhuys Publ., Sofia, Leiden, 54 pp. Bank, R. (2006) Towards a catalogue and bibliography of the freshwater Mollusca of Greece. Heldia, 6(1/2), 51–86. Glöer, P. (2015) Süßwassermollusken - Ein Bestimmungsschlüssel für die Muscheln und Schnecken im Süßwasser der Bundesrepublik Deutchland. Göttingen, Deutscher Jugendbund für Naturbeobachtung, 135 pp. Glöer, P. & Meier-Brook, C. (2003) Süsswassermollusken – Ein Bestimmungsschlüssel für die Bundesrepublik Deutschland. Deutscher Jugendbund für Naturbeobachtung (Hrsg.), Hamburg, 13. neubearbeitete, Auflage, 134 pp. Hubenov, Z. (2007) Fauna and zoogeography of marine, freshwater, and terrestrial mollusks (Mollusca) in Bulgaria. In: Fet, V. & Popov, A. (Eds), Biogeography and ecology of Bulgaria. Springer, Dodrecht, 141-198. Zettler, M. & Glöer, P. (2006) Zur Ökologie und Morphologie der der Norddeutschen Tiefebene. Heldia, 6, 1–61.

Ecol. Mont., 2 (4), 2015, 342-343 343