Catalogue of the stygobiotic and troglophilous freshwater snails (Gastropoda: Rissooidea: Hydrobiidae) of Bulgaria with descriptions of five new species

Dilian Georgiev


New investigations of freshwater habitats in caves revealed five new species of the Rissooidea in Bulgaria. The new species: Belgrandiella maarensis n. sp., Pontobelgrandiella tanevi n. sp. (the second species from this genus ever known), Bythiospeum simovi n. sp., Bythiospeum kolevi n. sp., Bythiospeum stoyanovi n. sp. are described and types illustrated. A synopsis of all published data on this ecological gastropod group in the country was compliled and complemented by author’s unpublished data to provide a catalogue of all known Bulgarian stygobiotic and troglophilous freshwater snails with their localities.


new species; caves; Balkans; gastropods


Angelov A. 1959. Neue Gastropoden aus den unterirdischen Gewässern Bulgariens. Archiv für Molluskenkunde, 88(1/3): 51-54.

Angelov A. 1965. Neue Fundsträtten der Gattung Plagygeyeria. Archiv für Molluskenkunde, 94(3/4): 135-137.

Angelov A. 1967. Horatia (Hauffenia) lucidulus n. sp., ein neuer Vertreter der Molluskenfauna Bulgariens. Archiv für Molluskenkunde, 96(3/6): 145-148.

Angelov A. 1972. Neue Hydrobiidae aus Höhlengewässern Bulgariens. Archiv für Molluskenkunde, 102(1/3): 107-112.

Angelov A. 1976. Ein neuer Vertreter der Gattung Belgrandiella A. Wagner, 1927 (Gastropoda, Hydrobiidae) von Grundwassern Bulgariens. Acta zoologica bulgarica, 4: 78-80.

Angelov A. 2000. Mollusca (Gastropoda et Bivalvia) aquae dulcis, catalogus Faunae Bulgaicae. Pensoft & Backhuys Publ., Sofia, Leiden, 54 pp.

Arconada B., Ramos M. 2003. The Ibero-Balearic region: one of the areas of highest Hydrobiidae (Gastropoda, Prosobranchia, Risooidea) diversity in Europe. Graellsia, 59(2-3): 91-104.

Beron P., Daaliev T., Zhalov A. 2009. Caves and speleology in Bulgaria. Bulgarian Federation of Speleology, National Natural History Museum BAS, KOM Foundation, Sofia, 536 pp. (In Bulgarian).

Bernasconi R. 1990. Revision of the genus Bythiospeum (Mollusca Prosobranchia Hydrobiidae) of France, Switzerland and Germany. Münchenbuchsee, 44 pp.

Bodon M., Giusti F., Manganelli G. 1992. Amnicola callosa Paulucci, 1881, redescribed and assigned to Orientalina Radoman, 1978, a genus new for the Italian fauna (Gastropoda: Prosobranchia: Hydrobiidae). Journal of Molluscan Studies, 58: 83-92.

Boeters H. 1970. Die Gattung Microna Clessin, 1890 (Prosobranchia: Hydrobiidae). Archiv für Molluskenkunde, 100(3/4): 113-145.

Boeters H. 1987. Moitessieriidae und Hydrobiidae in Spanien und Portugal (Gastropoda: Prosobranchia). Archiv für Molluskenkunde, 118(4/6): 181-261.

Boeters H. 1998. Mollusca: Gastropoda: Rissooidea. Süßwasserfauna von Mitteleuropea, 5(1/2), 76 pp.

Bole J., Velkovrh F. 1986. Mollusca from continental subterranean aquatic habitats. In: L. Botosaneanu (Ed.), Stygofauna Mundi. Brill. Leiden, pp. 177-208.

Boss K. 1971. Critical estimate of the number or recent mollusca. Occasional Papers on Molluscs, 3(40): 81-135.

Davis G. 1982. Historical and ecological factors in the evolution, adaptative radiation and biogeography of freshwater mollusks. American Zoologist, 22(2): 375-395.

De Mattia W. 2007. A new subterranean hydrobiid from a thermal spring in eastern Slovenia: „Iglica” velkovhi n. sp. (Gastropoda: Prosobranchia: Hydrobiidae). Mollusca, 25(1): 27-31.

Georgiev D. 2009. Bythinella gloeeri n. sp. – a new cave inhabiting species from Bulgaria (Gastropoda: Risooidea: Hydrobiidae). Acta zoologica bulgarica, 61(3): 223-227.

Georgiev D. 2011a. A new species of Belgrandiella (Wagner 1927) (Mollusca: Gastropoda) from caves in Northern Bulgaria. Acta zoologica bulgarica, 63(1): 7-10.

Georgiev D. 2011b. New localities of four Bulgarian Hydrobiidae species (Gastropoda: Risooidea). Zoonotes, 16: 1-4.

Georgiev D. 2011c. New species of snails (Mollusca: Gastropoda: Risooidea) from cave waters of Bulgaria. Buletin Shkenkor, 61: 83-96.

Georgiev D. 2012a. New taxa of Hydrobiidae (Gastropoda: Risooidea) from the Bulgarian cave and spring waters. Acta zoologica bulgarica, 64(2): 113-121.

Georgiev D. 2012b. wo New Species of Stygobiotic Snails from the Genus Bythiospeum (Gastropoda: Hydrobiidae) from Bulgaria. Acta Zoologica bulgarica, Suppl., 4: 15-18.

Georgiev D., Glöer P. 2011. Two new species of a new genus Devetakia gen. n. (Gastropoda: Hydrobiidae) from the caves of Devetashko Plateau, North Bulgaria. Acta zoologica bulgarica, 63(1): 11-15.

Georgiev D., Glöer P. 2013. Identification key of the Rissooidea (Mollusca: Gastropoda) from Bulgaria with a description of six new species and one new genus. North-Western Journal of Zoology, 9(1): art.131301.

Giusti F. 1979. Il genere Mercuria (Prosobranchia: Hydrobioidea) nell`Isola di Sardegna. Archiv für Molluskenkunde, 110(1/3): 1-14.

Giusti F., Pezzoli E. 1980. Hydrobioidea nuove o poco conosciute dell`Italia appenninica (Gastropoda: Prosobranchia). Archiv für Molluskenkunde, 111(4/6): 207-222.

Giusti F., Bodon M. 1983. Nuove Hydrobiidae dell`Italia nord-occidentale. Archiv für Molluskenkunde, 114(4/6): 157-181.

Glöer P., Meier-Brook C. 2003. Süsswassermollusken – Ein Bestimmungsschlüssel für die Bundesrepublik Deutschland. Deutscher Jugendbund für Naturbeobachtung, Hamburg, Auflage, 134 pp.

Glöer P., Georgiev D. 2009. New Rissooidea from Bulgaria (Gastropoda: Rissooidea). Mollusca, 27(2): 123-136.

Hershler R., Ponder W. 1984. A review of morphological characters of hydrobioid snails. Smithsonion Contribution to Zoology, Number 600, 55 pp.

Kabat A., Hersler R. 1993. The prosobranch family Hydrobiidae (Gastropoda: Rissooidea): Review of classification and supraspecific taxa. Smithsonian Contributions to Zoology, 547: 1-94.

Knight J., Batten R., Yochelsen E., Cox L. 1960. Supplement, Paleozoic and some Mesozoic Caenogastropoda and Opisthobranchia. In: R. C. Moore (Ed.). Treatise on invertebrate paleontology, Part 1, Mollusca 1. Geological Society of America & University of Kansas Press, New York & Lawrence, pp. 310-331.

Radoman P. 1983. Hydrobioidea a superfamily of Prosobranchia (Gastropoda). I. Systematics. Monographs 547, Serbian Academy of Sciences and Arts, Beograde, 256 pp.

Radoman P. 1985. Hydrobioidea, a superfamily of Prosobranchia (Gastropoda). II. Origin, zoogeography, evolution in the Balkans and Asia Minor. Department of Cartography “Georkarta” Publ., Beograde, 173 pp.

Schütt H. 1972. Ikonographische Darstellung der unterirdisch lebenden Molluskengattung Plagygeyeria Tomlin. Archiv für Molluskenkunde, 102(1/3): 113-123.

Wagner A. 1927. Studien zur Molluskenfauna der Balkanhalbinsel mit besonderer Berücksichtigung Bulgariens und Thraziens, nebst monographischer Bearbeitung einzelner Gruppen. Annales Zoologici Musei Polonici, 6(4): 263- 399.


  • There are currently no refbacks.