Wedescription of Criconetna giardi (Certes, 1889) Micoletzky, 1925, type species of the genus Criconema

A critical review of the publication in which Certes (1889) successively described Dorylaimus giardi and Eubos-trichus guernei demonstrates that the latter species (now the type species of the genus Criconelna Hofmanner & Menzel, 1914) has been described on juvenile forms pertaining to two different species. A diEcult expedition by the senior author to the type locality of both Certes ’ species (Hoste Island, Tierra del Fuego, Chile) permitted sampling of a species of criconematid of which the females fit the original description and illustration of Criconelna giardi (Certes, 1889) Micoletzky, 1925, the first criconematid ever described; the juveniles of this species agree morpho-logically with the first form of juvenile described by Certes under the name of Eubostrichus guernei. Consequently Criconelna guernei (Certes, 1889) Menzel i n Hofmanner & Menzel, 1914 becomes a junior synonym of Criconema giardi which must be considered the type species of the genus. A redescription of female, male and juveniles of C. giardi is given together with numerous illustration (drawings and SEM micrographs). A neotype is designated. RÉSUMÉ Redescription de Criconema giardi (Certes, 1889) Micoletzky, 1925, espèce type du genre Criconema Hofrnünner h Menzel, 191