Morphological Study of the Horsehair Worm, Chordodes koreensis (Nematomorpha: Gordiida), Isolated in Canine Vomitus

개의 구토물에서 분리한 오디흑연가시(철선충)의 형태학적 연구

  • Son, Hwa-Young (Institute of Veterinary Science, College of Veterinary Medicine, Chungnam National University) ;
  • Chae, Joon-Seok (College of Veterinary Medicine, Seoul National University) ;
  • Kim, Hyeon-Cheol (School of Veterinary Medicine, Kangwon National University) ;
  • Park, Bae-Keun (Institute of Veterinary Science, College of Veterinary Medicine, Chungnam National University)
  • 손화영 (충남대학교 동물의과학연구소.수의과대학) ;
  • 채준석 (서울대학교 수의과대학) ;
  • 김현철 (강원대학교 수의과대학) ;
  • 박배근 (충남대학교 동물의과학연구소.수의과대학)
  • Published : 2009.08.31

Abstract

This report deals with the morphology of the horsehair worm isolated in canine vomitus. We received a worm in living status. The worm was investigated by using light and scanning electron microscopy (SEM) for species determination. Grossly, the worm was blackish brown in color and 215 mm in length and 1.2 mm in maximum width. Microscopically, the worm was composed of epicuticle, cuticle, epidermis, muscle, mesenchyme, pseudocoel, nerve cord and gut. But the genital organ was not developed. The SEM study revealed that the cuticle contains five types of elevated structures called areoles. The cuticular surface of the parasite is covered by an abundant type of areoles: simple areole, tubercle areole, bulging areole, crowned areole, circumcluster areole. The observed characteristics of the specimen in this study are same to those of genus Chordodes. And we concluded that it is a male of Chordodes koreensis belong to Gordiida. Only nine species of freshwater Nematomorpha are known from Korea, two of which belong to the genus Chordodes. But the case of parasitic horsehair worm in dogs do not recorded, and this is a first gordiosis of dog in Korea.

개의 구토물에서 발견된 기생충의 진단을 의뢰 받았다. 충체는 육안상 흑갈색을 띠고 있었고 길이 215 mm, 폭 1.2 mm 였다. 광학현미경에서 각피, 각피하층, 근층 내에 mesenchyme, nerve cord, pseudocole, 장이 존재하였으나 생식기는 관찰되지 않았다. 각피의 주사전자현미경 관찰에서 5개의 특징적인 areoles이 관찰 되었다. 5개의 Areole의 형태는 각각 simple, tubercle, bulging, crowned, circumcluster areole로서 Chododes속의 특징적인 형태를 지니고 있었다. 입의 발달은 미약하였고 총배설강은 후단에서 3.7 mm 전방 배측 정중선에 개구하였으며 후단 정중선에 얕은 구가 존재 하였다. 상기의 결과에 근거하여 오디흑연가시(Chordodes koreensis)의 수컷 유충으로 동정하였다. 철선충증의 인체보고는 많이 있으나 개에서의 보고는 거의 없으며 이는 국내 최초의 개에서의 오디흑연가시증의 증례보고이다.

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