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One new and one known species of parasitic nematodes are reported from Thailand for the first time:  Falcaustra kaverii  (Karve et Naik,1951)  (Kathlaniidae) from the intestine of the freshwater fish  Poropuntius deauratus  (Valenciennes) (Cyprinidae) (new host record) and  Ascarophis scatophagi  sp. nov. (Cystidicolidae) from the intestine of the marine fish  Scatophagus argus  (Linnaeus) (Scatophagidae). The morphology of both these species was studied with the use of light (LM) and scanning electron microscopy (SEM) (the latter method used for F.  kaverii  for the first time). The new species ( A .  scatophagi ) is mainly characterized by nonfilamented, markedly elongate-oval eggs (size 42–45 × 18 μm), spicules 555–642 μm and 105–150 μm long, the muscular/glandular oesophagus length ratio (1:13–34), bifurcate deirids, the length of the female tail (159–249 μm) and cephalic structures typical of the nominotypical subgenus  Ascarophis . Representatives of  Falcaustra  Lane, 1915 and  Ascarophis  van Beneden, 1871 were not previously reported from fishes in Thai waters.

acta parasitologica

Two nematode species from freshwater and marine fishes in Thailand, including  Ascarophis scatophagi  sp. nov. (Cystidicolidae) from  Scatophagus argus  (Scatophagidae)