Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand

Four new species of the families Hemioniscidae and Crinoniscidae are described from New Zealand waters: Crinoniscus politosummus sp. nov., C. cephalatus sp. nov., Scalpelloniscus vomicus sp. nov. and S. nieli sp. nov. Mature males and females are described for all species, and the epicaridium larva is described for S. vomicus sp. nov. Males of the two species of Scalpelloniscus can be distinguished from S. penicillatus and S. binoculis by coxal plate dentition, relative sizes of propodus and dactylus. Crinoniscus politosummus sp. nov. and C. cephalatus sp. nov. can be separated from the only other congener Crinoniscus equitans by the body shape of the mature females, and shape of antennule article 1 of the males. A single specimen tentatively identified as S. cf. penicillatus is also recorded from New Zealand waters. These species are the first records of cryptoniscoid isopods infecting thoracic barnacles from the South West Pacific.