TUTUNEMA TUTU N. G., N. SP., A PRIMITIVE MEMBER OF THE HETHIDAE (NEMATODA, RHIGONEMATIDA, RANSOMNEMATOIDEA) PARASITIC IN A PAPUA-NEW-GUINEADIPLOPOD

Tutunema tutu n. g., n. sp. is described from the gut of a large spiro bolid millipede (? Polyconoceras sp.) from Papua New Guinea and illust rated with the aid of SEMs. The new genus belongs to the Hethidae and has characters regarded as primitive when compared to Heth, the only o ther genus in the family. Like Heth, the genus is sexually dimorphic, female Tutunema tutu n. g., n. sp. differing from Heth spp. in having: less developed, simpler, pseudolabia with unfringed margins; a single , retrorse, unspined cervical collar; other cervical spination absent; and three hypertrophied cuticular projections in the stoma. The males lack a midventral sucker, but have the normal complement of 15 copula tory papillae found in Heth.