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The taxonomic position of two antarctic dorylaimid species    Amblydorylaimus   isokaryon    (Loof, 1975) Andrássy, 1998 and    Pararhyssocolpus   paradoxus    (Loof, 1975),  gen. n. ,  comb. n.  are discussed on the basis of morphological, including SEM study, morphometric, postembryonic and sequence data of 18S rDNA and the D2-D3 expansion fragments of large subunit rDNA. The evolutionary trees inferred from 18S sequences show insufficient resolution to determine the assignment of the two species to particular families, moreover    P.   paradoxus    gen. n. ,  comb. n.  (=   Rhyssocolpus   paradoxus   ) previously regarded as a member of   Nordiidae   or   Qudsianematidae  , showed distant relationship both to    Rhyssocolpus   vinciguerrae    and    Eudorylaimus    spp. The phylogram inferred from 28S sequences revealed that    A.   isokaryon    is a member of a well-supported group comprised of several    Aporcelaimellus    spp., while, no close relationships could be revealed for the    P.   paradoxus    gen. n. ,  comb. n.  to any nematode genus. On the basis of molecular data and morphological characteristics, some taxonomic changes are proposed.    Amblydorylaimus   isokaryon    is transferred from family   Qudsianematidae   to family   Aporcelaimidae  , and a new monotypic genus    Pararhyssocolpus    gen. n.  is proposed, attributed to   Pararhyssocolpidae   fam. n.  The diagnosis of the new family is provided together with emended diagnosis of the genera    Amblydorylaimus    and    Pararhyssocolpus    gen. n.  Data concerning distribution of these endemic genera in the Antarctic region are also given.

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New data on two remarkable Antarctic species    Amblydorylaimus   isokaryon    (Loof, 1975) Andrássy, 1998 and    Pararhyssocolpus   paradoxus    (Loof, 1975), gen. n., comb. n. (  Nematoda  ,   Dorylaimida  )