17 Terrestrial Cave Animals in Bulgaria Petar Beron National Museum of Natural History, Bulgarian Academy of Sciences, Tsar Osvoboditel Blvd. 1, 1000 Sofia, Bulgaria, e-mail:
[email protected] Abstract: Karstic landscape cover about 22.7% of the Bulgarian territory, with more than 5000 caves and potholes. Regular exploration of the cave fauna of Bulgaria started in 1922, and by the end of 2005 more than 800 animal species have been reported from 780 caves. Troglobite and stygobite species are 167, most of them Bulgarian endemics. The most important groups are Diplopoda (54 spp, 17 troglobites), Coleoptera (123 spp, 41 troglobites), and others. Monograph on the cave fauna of Bulgaria is being prepared, containing all available data and bibliography of over 500 titles. Main centers of biospeleological studies are the National Museum of Natural History and the Institute of Zoology (Bulgarian Academy of Sciences) 1 Introduction Bulgaria is situated in one of the richest regions housing cave animals, especially the terrestrial ones: the eastern part of the Balkan Peninsula. Bulgarian cave fauna has been explored very actively, mostly by the Bulgarian biospeleologists. This is due mainly to the solid tradition left by the school of Dr. Ivan Buresch but also to the well-developed speleology, traditionally centered on the scientific research and led by specialists from Bulgarian Academy of Sciences. Already for more than 80 years, Bulgarian biospeleologists explore the rich troglobite fauna of their country, its karst containing almost 5000 caves. The results have been put together by several authors and now form a very solid basis for zoogeographical analysis.