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BackgroundReliable taxonomy underpins communication in all of biology, not least nature conservation and sustainable use of ecosystem resources. The flexibility of taxonomic interpretations, however, presents a serious challenge for end-users of taxonomic concepts. Users need standardised and continuously harmonised taxonomic reference systems, as well as high-quality and complete taxonomic data sets, but these are generally lacking for non-specialists. The solution is in dynamic, expertly curated web-based taxonomic tools.The Pan-European Species-directories Infrastructure (PESI) worked to solve this key issue by providing a taxonomic e-infrastructure for Europe. It strengthened the relevant social (expertise) and information (standards, data and technical) capacities of five major community networks on taxonomic indexing in Europe, which is essential for proper biodiversity assessment and monitoring activities. The key objectives of PESI were: 1) standardisation in taxonomic reference systems, 2) enhancement of the quality and completeness of taxonomic data sets and 3) creation of integrated access to taxonomic information.New informationThis paper describes the results of PESI and its future prospects, including the involvement in major European biodiversity informatics initiatives and programs.

Biological names play an important role in resource identification and as anchors for all sorts of associated information. This is borne out in ever-expanding online resources but the ways in which names are stored and presented give rise to challenges and pitfalls that can lead to missed or misinterpreted information. These resources must serve a variety of users and keep abreast of changes in nomenclature and systematics. Observations on the use of biological names are presented and some solutions to the challenges are offered.

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