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PHYLOGENETIC POSITION OF NEOGOGATEA (DIPLOSTOMOIDEA; CYATHOCOTYLIDAE).

Tyler J Achatz, Zoe S Von Holten, Dana M Calhoun

The Journal of Parasitology

|November 19, 2025

Summary

This study provides the first genetic data for Neogogatea kentuckiensis, a bird parasite. Phylogenetic analysis using ribosomal RNA genes places it within the Cyathocotylidae family, suggesting potential cryptic species.

Keywords:

Cyathocotylidae Diplostomoidea Molecular phylogeny Neogogatea Osprey Pandion

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Area of Science:

Parasitology
Molecular Phylogenetics
Ornithology

Background:

Neogogatea is a small genus of cyathocotylid digeneans found in birds of prey.
Limited genetic data exists for properly identified Neogogatea species.

Purpose of the Study:

To obtain and analyze molecular sequence data from mature Neogogatea kentuckiensis specimens.
To infer phylogenetic relationships and assess species-level genetic variation.

Main Methods:

Collected adult Neogogatea kentuckiensis from osprey in the Nearctic region.
Sequenced fragments of the nuclear 28S ribosomal RNA gene and mitochondrial COI gene.
Performed phylogenetic inference using 28S data and comparative analysis using COI data.

Main Results:

Phylogenetic analysis placed N. kentuckiensis within a clade containing Mesostephanus, Braunina, and an unidentified cercaria.
Variability observed in the COI gene sequences among different isolates.

Conclusions:

The study provides the first molecular data for Neogogatea, contributing to the understanding of cyathocotylid digenean evolution.
COI gene variability suggests the possibility of multiple Neogogatea species in New World osprey, warranting further investigation with broader sampling.