Criconematidae (Nematoda) from oak forests in two nature reserves in Russia

Seven criconematid species: Ogma menzeli, Criconema annuliferum, C. princep s, Criconemoides pleriannulatus, Mesocriconema solivagum, M. xenoplax and X enocriconemella macrodora were recovered from soil samples collected from o ak forests in the Shulgan-Tash and Voronezh nature reserves in Russia. Exam ination of C. pleriannulatus by SEM confirmed the absence of submedian lobe s and revealed the presence of a small lip annule; juveniles exhibit fringe -like cuticular ornamentation of the annules. Ogma menzeli and C. pleriannu latus are new geographical records for Russia, and all species have already been reported in association with different oak species with the exception of M. solivagum and C. pleriannulatus. Criconemoides mutabilis Eroshenko, 1980 is proposed as a junior synonym of C. pleriannulatus Ebsary, 1979.