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The snails were collected from 35 sites during 2 cycles of the wet (July\u2013October) and dry (November\u2013June) seasons in 2018\u20132019. A total of 29,420 snails representing 24 species\/subspecies were examined for cercarial infection using shedding and crushing techniques. We found that 1,275 snails from 12 species\/subspecies were infected, resulting in an overall prevalence of 4.3%. Infections were significantly higher (p&lt;0.001) during the wet season (5.9%; 970\/16,473) than during the dry season (2.4%; 305\/12,947). Morphological identification revealed 37 distinct types within 15 morphotypes, with the armatae morphotype showing the highest infection rate (1.8%) and the greatest cercarial diversity (8 distinct types). This study highlights the health risk posed by the Bithynia siamensis siamensis, which was the second most prevalent (8.5%) and hosted the greatest cercarial diversity (11 morphotypes, 15 distinct types). This subspecies also displayed a wide distribution range (31 localities) with a generally high occurrence frequency in the BMR. This study firstly documents a gymnophallid digenean as a freshwater digenean, presenting evidence of a dichotoma cercarial morphotype from 4 species\/subspecies (Filopaludina martensi martensi, F. sumatrensis polygramma, B. siamensis siamensis, and Wattebledia siamensis) with a low infection range (0.1\u20130.4%). A staggering diversity of cercariae was observed in the BMR canal networks with seasonal fluctuations. The B. siamensis siamensis displayed notable epidemiological importance in the BMR flowing-water networks. This study provides quantitative and qualitative morphological descriptions and measurement guidelines for the dichotoma cercaria in Thailand.<\/jats:p>","DOI":"10.3347\/phd.24033","type":"journal-article","created":{"date-parts":[[2024,11,28]],"date-time":"2024-11-28T04:36:17Z","timestamp":1732768577000},"page":"461-475","update-policy":"https:\/\/doi.org\/10.3347\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Infection status and species diversity of trematode cercariae in freshwater snails from canal networks in the Bangkok Metropolitan Region, 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