Revision of the Gonioctenanivosa species-group (Coleoptera Chrysomelidae Chrysomelinae) in the Holarctic region with descriptions of two new species

摘要

The Gonioctena nivosa species-group of the genus Gonioctena Chevrolat, 1836 is defined and reviewed. It contains six species including two new to science: Gonioctena gracilicornis (Kraatz, 1879), Gonioctena nivosa (Suffrian, 1851), Gonioctena norvegica (Strand, 1936), Gonioctena springlovae (Bechyně, 1948), Gonioctena amurensis Cho & Borowiec, >sp. n. and Gonioctena jani Cho & Borowiec, >sp. n. Six new synonyms are proposed: Gonioctena nivosa (= Gonioctena arctica alberta Brown, 1952, >syn. n., Phytodecta linnaeana bergrothi Jacobson, 1901, >syn. n., Phytodecta linnaeanus var. mutatus Achard, 1924, >syn. n., Phytodecta linnaeanusvar.simplex Achard, 1924, >syn. n. and Phytodectanivosavar.cedehensis Ronchetti, 1922, >syn. n.) and Gonioctenanorvegica (= Gonioctenajanovskii Medvedev, 1976, >syn. n.). Phytodectaflavicornisvar.limbatipennis Achard, 1924 and Phytodectanivosavar.bicolor Heyden, 1883 are removed from synonymy with Gonioctenanivosa (Suffrian, 1851) and are synonymized with Gonioctenaflavicornis (Suffrian, 1851). Distribution maps, a key to species, color variation, geographic variation of male genitalia and host plants are provided. Ovoviviparity is newly recorded in Gonioctenagracilicornis and Gonioctenanivosa. Lectotypes are designated for Gonioctenaaffinis, Gonioctenaarctica, Gonioctenalinnaeanabergrothi and Gonioctenanivosa.