An update on the phylogeny of capillariid nematodes based on 18S rDNA sequences of Amphibiocapillaria tritonispunctati (Diesing, 1851) and four other species
Year: 2025
Type: article
Abstract: The nematode family Capillariidae represents a taxonomically complex and understudied group of parasitic nematodes infecting a broad range of vertebrate hosts. Despite more than 300 described species, phylogenetic relationships within the family remain unresolved due to limited molecular data and ongoing taxonomic revisions. In this study, we generated new sequences of the 18S ribosomal RNA gene for Amphibiocapillaria tritonispunctati from the Danube crested newt, Triturus dobrogicus , and four additional capillariid species ( Aonchotheca annulosa , Baruscapillaria inflexa , Eucoleus sp. 1 from the common starling Sturnus vulgaris , and Eucoleus sp. 2 from the black-headed gull Chroicocephalus ridibundus ) from birds and rodents, expanding the molecular dataset for the group. Phylogenetic analyses using Bayesian inference and Maximum Likelihood methods revealed A. tritonispunctati as the earliest-diverging lineage within the Capillariidae, suggesting deep evolutionary divergence. Our results also supported the monophyly of Eucoleus and Capillaria and confirmed the distinctness of Baruscapillaria . Morphological examination of A. tritonispunctati corroborated its identification and highlighted the weight of diagnostic characters of the genus Amphibiocapillaria . Our findings underscore the need for broader molecular sampling and integrative taxonomy to clarify capillariid systematics and host-parasite relationships, particularly among nematodes from cold-blooded vertebrates. • Morphological description provided for Amphibiocapillaria tritonispunctati. • Novel 18S rDNA sequences generated for A. tritonispunctati , Aonchotheca annulosa , Baruscapillaria inflexa and Eucoleus spp. • Bayesian inference and maximum likelihood phylogenies recovered A. ritonispunctati as a basal taxon of the Capillariidae.
Institutions: National Academy of Sciences of Ukraine, Taras Shevchenko National University of Kyiv, North-West University, I.I. Schmalhausen Institute of Zoology, Slovak Academy of Sciences, Institute of Parasitology of the Slovak Academy of Sciences, Centre National de la Recherche Scientifique, Daugavpils University, Institut Pluridisciplinaire Hubert Curien, Université de Strasbourg
Language: English
Subfield: Ecology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,350
OpenAlex ID: W4414420830