According to the current state of knowledge the terrestrial gastropod fauna of Bulgaria includes 226 species and 33 subspecies (excluding nominate ones), making altogether 259 taxa. The following new data are presented: updated nomenclature of 50 taxa, synonymisation of 17 taxa; taxa whose presence in Bul-garia was discovered and those which were described as new to the science after the publication of the last checklist (1998) are now included, six taxa are evaluated as introduced; the taxonomic status of 13 taxa is re-garded as unclear. Fifty seven taxa are regarded as endemic to Bulgaria, and 33 as endemic to the Balkan Pen-insula; 60 taxa are regarded as rare.
Irikov, A., & Eröss, Z. (2009). An updated and annotated checklist of Bulgarian terrestrial gastropods (Mollusca: Gastropoda). Folia Malacologica, 16(4), 197–205. https://doi.org/10.12657/folmal.016.015