Helminths of the rock lizards Darevskia dahli and D. armeniaca in their invaded range in Ukraine.

Abstract

This study investigated the helminths of the mixed invasive population of Darevskia armeniaca and D. dahli, collected during two field trips in Denyshy, Zhytomyr region, Ukraine, in 2023. In total, 67 adult lizards (35 D. armeniaca and 32 D. dahli) were examined. Molecular and morphological approaches were used to identify the parasites. The analyses revealed six helminth species, including four nematodes (Toxocara cati, Strongyloides darevskyi, Oswaldocruzia sp., and Spirurida gen. sp.), one trematode (Pleurogenes claviger), and one cestode (Mesocestoides litteratus). Toxocara cati had the highest prevalence, found in cysts located primarily on the liver and in the body cavity of the hosts. The qualitative and quantitative comparative assessment of the helminth community suggests that, due to the introduction of these lizards, most helminth species from their native range have been lost. Additionally, most local helminth species have not yet adapted to parasitising these lizards as normal hosts of their life cycle.