Publication date: Available online 21 January 2017
Source:Asian Pacific Journal of Tropical Medicine
Author(s): Chalobol Wongsawad, Nattawadee Nantarat, Pheravut Wongsawad
ObjectiveTo examine the taxonomic boundaries in the Stellantchasmus populations in different hosts and reveal the cryptic speciation of the Stellantchasmus in Thailand based on both morphological and molecular approaches.MethodsStellantchasmus falcatus (S. falcatus) s.l. was collected from different hosts throughout Thailand. The worms were examined and measured. The nuclear ITS2 gene and the mitochondrial COI gene were used to investigate the S. falcatus s.l. from Dermogenus pusillus and Liza subviridis.ResultsStellantchasmus was one of food-borne trematode that widely distribute throughout Thailand. The comparison of S. falcatus s.l. from Dermogenus pusillus and Liza subviridis indicated a genetic divergence of nuDNA with 3.6% and mtDNA with 19.3%, respectively. Morphological characteristics were fairly different in the ratio of body size, length of prepharynx, and ratio of organ size.ConclusionsOur results provide initial evidence that S. falcatus s.l. from different hosts tend to be a different species based on both molecular and morphological characters. Cryptic species complexes are generally found among parasites that tend to have large populations and/or rapid evolution. The degree of genetic diversity existing would suggest the practice of targeted regimes to design and minimize these lections of anthelmintic resistance in the future.
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