Pisauridae (Arachnida: Araneae)

Description

Four closely related species of Pisauridae (nurseryweb spiders) are found in New Zealand; three on the mainland and one on the Chatham Islands. All species are endemic to New Zealand and are likely to be related to Australian species. The most common species is Dolomedes minor, found throughout New Zealand in scrubland, grassland, swamps and marshes. Dolomedes aquaticus is found in open riverbeds and stony lakeshores throughout the South Island and in the southern half of the North Island. A new species of Dolomedes is found in shaded riverbeds throughout the mainland. The Chatham Island species, Dolomedes schauinslandi, is nationally endangered due to its restricted range. In this Fauna the genus Dolomedes and all New Zealand species are described, with information on synonymy, type data, material examined, and geographical distribution. Habitus images of adults, illustrations of important structural features, and distribution maps are provided. A key to adults is given. A molecular phylogenetic analysis examining the relationships of New Zealand species in the genus is presented.