Paravulvus rhodopensis sp n. (Nematoda: Nygolaimidae) and three known species from Bulgaria, with notes on the taxonomy of the genus

One new and three known species of the genus Paravulvus Heyns, 1968 from forests in Bulgaria are described and illustrated. Paravulvus rhodopensis sp. n. is a bisexual species characterised by a relatively thick cuticle with fine transverse striation, head region offset by a depression, mural tooth deltoid 6-7 mum long. presence of paravulvae posterior to vulva, tail bluntly conical rounded, 24-28 mum long with 7-10 mum hyaline part. Males with one adanal pair and a row of 11-14 supplements, spicules 31-42 mum and tail 22.0-26.5 mum long. Additional morphological and metrical data for P. acuticaudatus (Thorne, 1930), P. hartingii (de Man, 1880) and P. heynsi Vinciguerra, 1987 are presented. Paravulvus acuticaudatus and P. heynsi are new geographical records. An emended diagnosis and revised classification of the genus Paravulvus are proposed. and an identification key to the species is provided. paravulvus, paraamphigonicus (Altherr. 1950) is regarded as a synonym of P. hartingii.