First Record of Zoonotic Trematodes in Sermyla riquetii (Grateloup, 1840) from Thailand: Morphological and Genetic Characterization
DOI:
https://doi.org/10.58837/tnh.26.1.268480Keywords:
Sermyla riquetii, thiarid snail, trematode larvae, brackish water, ThailandAbstract
Sermyla riquetii, a thiarid gastropod, serves as an intermediate host for various trematodes in brackish and coastal habitats. This study examined 6,137 S. riquetii specimens from 29 sites across 16 Thai provinces to identify larval trematodes using morphological and molecular approaches. Cercariae were detected in 35 snails (0.57%) and assigned to three morphological types: (i) pleurolophocercous (including Centrocestus formosanus and Stellantchasmus falcatus), (ii) parapleurolophocercous (Procerovum cheni), and (iii) furcocercous (Transversotrema laruei). The pleurolophocercous type was the most prevalent. Phylogenetic analysis of the ITS2 region confirmed the identities of C. formosanus, S. falcatus, and P. cheni, which clustered with corresponding GenBank sequences. Molecular data could not differentiate between pleurolophocercous and parapleurolophocercous types. This is the first report of S. riquetii as a host for C. formosanus and P. cheni in Thailand. The findings provide important baseline data on trematode-snail associations and support the potential role of S. riquetii in the transmission of zoonotic trematodes. This study contributes to the understanding of parasite biodiversity in tropical estuarine ecosystems and highlights the need for monitoring snail populations in disease risk assessments.
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