The description of Stephanostomum spp. (Trematoda: Acanthocolpidae) from fishes of Tonkin bay

Nguyen Van Ha, Ha Duy Ngo


Three species of Stephnostomum Looss, 1899 are described from Tonkin bay, Vietnam. S. ditrematis (Yamaguti, 1939), from the intestine of Seriola dumerili (Perciformes: Carangidae), has 36 circum-oral spine; ventral spines slightly shorter than dorsal; oral spines shorter than aboral. S. bicoronatum (Stossich, 1883), from the intestine of Johnius carouna (Perciformes: Sciaenidae), has 30 circum-oral spine with ventral hiatus; aboral spines smaller than oral in mid-ventral area; seminal vesicle undivided; pars prostatica tubular, relatively short; ejaculatory duct long; testes near posterior end of hindbody. Stephnostomum sp., from the intestine of Harpadon nehereus (Aulopiformes: Synodontidae), has 28 circum-oral spine; prepharynx long (25% of body length). Stephnostomum sp. is morphometrically closer to S. fistulariae (Yamaguti, 1940).

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