Criconematids from a cypress forest of South Argentina.

One new and two known species of criconematids are described from a cypress forest in South Argentina. Ogma comahuensis sp.nov. is characterized by having eight longitudinal bands of semicircular scales with irregularly shaped spines, 58-70 body annuli, head with two crenated annuli of the same size, stylet 89-100 μm long, vulva on 8-11 annuli from posterior end and tail conical with pointed terminus. This species can be distinguished from the other species in the genus with tipped scales, by its peculiar semicircular scales packed by irregular shaped spines. Hemicycliophora arenaria males differ from the original description and from all other Hemicycliophora males in having a bursa reaching the tail tip. Criconema mutabile is described from male and females; the male has four lateral lines.