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The taxonomic position of the endemic Antarctic species    Enchodeloides   signyensis    (Loof, 1975),  gen. n. ,  comb. n.  (=    Enchodelus   signyensis    Loof, 1975) is discussed on the basis of morphological study, including SEM, morphometric data, postembryonic observations, and sequence data of 18S rDNA and the D2-D3 expansion fragments of the large subunit rDNA. A number of characters such as the cuticle and stoma structures, including the presence of moderately developed cuticularised ring around the oral aperture, peculiarities of pharynx expansion, size and position of the posterior pair of pharyngeal nuclei, a less complex uterus, and the position of a posterior ventromedian supplement show that this species differs substantially from the other members of the genus    Enchodelus   . Furthermore, both the 18S and 28S rDNA-based phylogenetic trees of the    Enchodelus    sequences available in the GenBank formed two distinct clusters with    E.   signyensis    being a part of a well-supported group with species of the genus    Pungentus   ; therefore, it is proposed that its taxonomic position should be reconsidered.

zookeys

Biogeography and phylogenetic position of    Enchodeloides   signyensis    (Loof, 1975), gen. n., comb. n. from Maritime Antarctic (  Nematoda  ,   Nordiidae  )