<italic>Turbiditylenchus corticeus</italic> n. gen., n. sp. (Rhabditida: Anguinidae) from the bark of <italic>Eucalyptus macrorhyncha</italic> from the Australian Capital Territory.

A new genus and species of the Anguinidae, <italic>Turbiditylenchus corticeus</italic> n. gen., n. sp., was isolated from the bark of <italic>Eucalyptus macrorhyncha</italic> from southeastern Australia. <italic>Turbiditylenchus corticeus</italic> is readily differentiated from all recognised anguinid genera and is characterised primarily by a slender body, lateral field with six incisures, an anteriorly flattened lip region continuous with the body, delicate stylet 7.9-9.9 <italic>μ</italic>m long, muscular median bulb containing a strongly refractive valve, post-vulval uterine sac 1.87-4.4 times vulval body diam., conical tail with pointed tip, and males with leptoderan bursa and spicules 20.5-25.8 <italic>μ</italic>m in length. The phylogenetic relationships of the new species with other anguinid lineages were reconstructed using sequences of the small subunit ribosomal RNA (18S rRNA), the internal transcribed spacer region (ITS; comprising ITS1-5.8S-ITS2) and partial large subunit ribosomal RNA (28S rRNA D2-D3) genes based on Bayesian inference and maximum likelihood analyses. These analyses demonstrate the new species represents a lineage distinct from all other anguinids. Based on phylogenetic results we also transfer <italic>Ditylenchus parvicauda</italic> Gu, Ma, Castillo & Munawar, 2024 and <italic>Ditylenchus gracicauda</italic> Gu, Ma, Castillo & Munawar, 2024 to <italic>Ditylenchoides</italic> Subbotin & Ryss, 2024 as <italic>Ditylenchoides parvicauda</italic> n. comb. and <italic>Ditylenchoides gracicauda</italic> n. comb. [ABSTRACT FROM AUTHOR]