Korean J Parasitol.  2021 Jun;59(3):303-309. 10.3347/kjp.2021.59.3.303.

Euryhelmis squamula (Digenea: Heterophyidae) Recovered from Korean Raccoon Dog, Nyctereutes procyonoides koreensis, in Korea

  • 1College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon 24289, Korea
  • 2College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
  • 3College of Veterinary Medicine, Chonbuk National University, Iksan 54596, Korea
  • 4College of Veterinary Medicine, Gyeongsang National University, Jinju 52828, Korea
  • 5Laboratory of Veterinary Internal Medicine, BK21 FOUR Future Veterinary Medicine Leading Education and Research Centre, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea
  • 6College of Ecology and Environmental Science, Kyungpook National University, Sangju 37224, Korea


In this study, we intended to describe an unrecorded species of heterophyid trematode recovered from the small intestine of a Korean raccoon dog, Nyctereutes procyonoides koreensis, in Korea. A total of 13 small flukes were collected from a deceased Korean raccoon dog which was found in Chuncheon-si, Gangwon-do, Korea in May 2017. The trematode body were covered with many small spines, rectangular, broader than long, 807-1,103 µm long and 1,270-1,550 µm wide. Oral sucker in the anterior end slightly smaller than acetabulum. Pharynx muscular and well developed. Esophagus relatively long and sigmoid. Acetabulum small and located at median in anterior 2/5 portion. Ceca bifurcated at the anterior of genital pore and acetabulum and terminated at testis level. Testes larger, deeply lobed and located at the near of posterior end of body. Ovary small, triangular and located at the slight left of median and the anterior of left testis. Vitelline follicles dendritic and extend from the middle level of esophagus to the posterior portion of body. Eggs embryonated, operculated, small and 33-35×15-16 µm in size. Based on the morphological characteristics, the small heterophyid flukes recovered from the small intestines of Korean raccoon dog, N. procyonoides koreensis, were identified as Euryhelmis squamula (Digenea: Heterophyidae). Accordingly, this species of heterophyid flukes is to be a new trematode fauna in Korea by this study.


Euryhelmis squamula; Nyctereutes procyonoides koreensis; Korean raccoon dog; Korea
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