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Revision of European and North African Folsomides Stach with special emphasis on the Canarian fauna (Collembola: Isotomidae)

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image of Insect Systematics & Evolution

The genus Folsomides Stach, 1922 is redefined and given a narrow definition based on a limited set of consistent morphological characters: Position and distribution of tergal macrosensilla, chaetotaxy of mouth region, tibiotarsi, ventral tube and furca. Eighteen new species are described from the Canary Islands: semiparvulus sp. n., xerophilus sp. n., vinosus sp. n., cumbrosus sp. n., unicus sp. n., terrus sp. n., pocosensillatus sp. n., nigrocellatus sp. n., teno sp. n., oromii sp. n., ononicolus sp. n., graminis sp. n., famarensis sp. n., pinicolus sp. n., intermedius sp. n., tonellus sp. n., supranubius sp. n. and analuisae sp. n. The following European/African species are redescribed: parvulus Stach, portucalensis Gama, angularis (Axelson), cf. petiti Delamare, lawrencei Gers & Deharveng, cf. zairensis Martynova, nanus Ellis and centralis (Denis). Highly discriminate species characters are found in maxillary palp, tibiotarsal chaetotaxy and distribution of tergal microsensilla. A number of species are removed from Folsomides, and Subisotoma Stach, 1947 is given generic rank.

Affiliations: 1: Zoological Department, Tromsø Museum, 9000 Tromsø, Norway


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