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The Siam Shield Leech,    Placobdelloides   siamensis   , is a common leech found on   Malayemys   turtles in Thailand. Sixty Snail-eating Turtles (29    Malayemys   macrocephala    and 31    M.   subtrijuga   ) were caught over twelve months (February 2017 – January 2018) to determine host characteristics (body size, weight and sex), parasitism (prevalence, intensity and density) and seasonal aquatic environmental factors (conductivity, nitrate nitrogen, dissolved oxygen, pH, salinity and total dissolved solids). There was no significant difference of infection rate between species and sex in both turtle species. Leech prevalence indicated that all turtle individuals were infected throughout year, while the infection rate was significantly higher in larger and heavier turtles mainly on the carapace with an average number of leech approximately 474.80 ± 331.38 individuals for individual host infection and 76.53 ± 20.27 individuals for infection per 100 g body weight. The high level of leech parasitism also caused a rot wound and shell hole which caused the host to die. Aquatic environmental factors did not influence the infection of leeches in both turtle species. Therefore, the factors that influenced the infection rate of    P.   siamensis    were based on only host body size and weight without effect from season. In addition, this study also showed two new hosts, including    Cyclemys   oldhamii    and    Heosemys   grandis    and the widespread distribution from northern, north-eastern, western, central and southern Thailand were reported.

biodiversity data journal

Parasitism of    Placobdelloides   siamensis    (Oka, 1917) (  Glossiphoniidae  :   Hirudinea  ) in Snail-eating Turtles,    Malayemys    spp., and the effects of host and aquatic environmental factors