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Approximately
700 species have been described in this family of cosmopolitan
distribution (Schoorl
1990).
Identification: de Freina &
Witt 1990, Forster
& Wohlfahrt 1960, Hoffmeyer 1974,
Koch 1964,
Razowski
1981, Schnaider
1978, Skinner
1984, 1985,
Zagulyaev
1989i.
Nomenclature according to Fauna
Europaea.
Species in Belgium: 3.
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