Inspection on materials contributing to the knowledge of terrestrial Isopoda (Crustacea, Oniscidea) in Finland

Authors

• Ferenc Vilisics
• Juhani Terhivuo

Abstract

Identifications of 226 terrestrial isopod samplesmostly coming from the unidentified domestic material stored in the Finnish Museum of Natural History, and from our field surveys referred to the following species; Hyloniscus riparius, Trichoniscus pusillus, Oniscus asellus, Porcellio dilatatus, P. spinicornis, P. scaber, Cylisticus convexus, Trachelipus rathkii, Armadillidium opacum, A. pictum, A. pulchellum, A. nasatum, A. vulgare and A. zenckeri. Field populations of A. vulgare and H. riparius were recorded for the first time in Finland, while T. rathkii specimens from Lapua prove that isopods’ distrubution reaches the Finnish inland.We also revisited thematerial donated tomuseum collections by the late Professor E. Palmén and we found old samples of P. dilatatus collected in greenhouses in Helsinki, Salo and Halikko and identified but not published by him. We also discuss the ranges of terrestrial Isopoda in Finland where they live at the northern margins of their distributions.