Summary 1.Ecological field studies dealing with invertebrates are regularly applied, often using various special kinds of traps within a relatively intensive trapping program. During such programs, large amounts of bycatch -animal material not needed for the original scientific aim of the study -are collected. 2. We discuss general aspects about the handling of such bycatches. Given that the potential utility of bycatches from trapping programs can be immense, we strongly advocate a more thorough handling of the bycatch material than is currently typically practised. 3. Ways for an efficient transfer of bycatches between taxonomic experts have to be established. Problems concerning labelling as well as concerning costs and space for storage have to be solved to facilitate adequate management of the collected material.

The present study provides a robust data set for ecological planning and conservation of dry ecosystems in western Germany in general and North Rhine-Westphalia in particular. We summarised all available data from recent publications that dealt with spiders in dry ecosystems of North Rhine-Westphalia. Additionally, so far unpublished results of a detailed investigation regarding spiders in sand habitats of the Westphalian Bay that was conducted between 2006 and 2008 are presented. The analysis focussed on the habitat types according to Annex I of the EU Habitats Directive and related habitats. The investigation areas were scattered in the federal state of North Rhine-Westphalia. The data set comprised a total of 84436 individuals from 371 species and 28 families. Overall, an endangerment status is assigned to 68 species. Of these, 12 spiders are in imminent danger of becoming extinct. Two species, Erigonoplus globipes and Meioneta simplicitarsis, are believed to be extinct in North Rhine-Westphalia. Seven species (Dictyna major, Mastigusa arietina, Micaria formicaria, Styloctetor romanus, Thanatus striatus, Theridion uhligi and Xysticus ferrugineus) are new to the arachnofauna of North Rhine-Westphalia

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