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The oonopid spiders (Oonopidae) Tapinesthis inermis (Simon, 1882) and Triaeris stenapis Simon, 1891 are recorded for the Czech Republic for the first time. T. inermis was redetermined from misidentified material and T. stenaspis was discovered in a greenhouse.
A descriptive model of primary succession of spiders on a brown-coal dump is presented. Multivariate methods (cluster analysis and detrended correspondence analysis), and community indexes were applied to evaluate changes in community composition of epigeic spiders. Two different rehabilitation age stages were investigated. The cluster analysis helped to determine a case of horizontal asynchronous succession. The DCA was able to distinguish divergent trends of succession from the initial stage. Successional trends in species replacements were observed. In all aspects of succession there was found to be directional towards a "ruderal steppe" subclimax.
Representatives of Oonopidae are tiny spiders, usually of a pale colour, with 6 oval eyes. Systematically, they belong to Dysderoidea, which include about 120 genera (CODDINGTON & LEVI 1991), but Oonopidae, alone, include 51 genera and more than 70 species (PLATNICK 1989). They are distributed all over the world, except for Antarctica, but most of the species come from the tropics. In Europe, there are 6 genera of oonopid spiders, represented by about 20 species (PLATNICK 1989). But only 6 species have been known from the Central Europe until recently (NENTWIG 1991). In Slovakia, only 2 species of oonopid spiders, Oonops domesticus Dalmas, 1916 and Triaeris stenaspis Simon, 1891, have been recorded so far (GAJDOS et al. 1999).