The Cystacanth of Sphaerirostris lanceoides (Acanthocephala: Centrorhynchidae) Recovered from the Korean Raccoon Dog (Nyctereutes procyonoides koreensis)

초록

Cystacanths were recovered from the small intestines of three Korean raccoon dogs (Nyctereutes procyonoides koreensis) in Korea. Their morphology was examined using light and scanning electron microscopy, and molecular characterization was performed based on partial 18S rRNA and cytochrome oxidase subunit I (COI) gene sequences. Body length was 2,442-2,848 µm in males and 3,030-4,080 µm in females. The trunk was spindle-shaped, gradually tapering toward both extremities, and rounded posteriorly. The anterior proboscis was nearly spherical, bearing 10-13 hooks per longitudinal row and 32-36 longitudinal rows. A pair of testes was observed in males. A single elongated oval ovary was observed in two larger females; however, eggs and ovarian balls were not detected. The COI sequence showed 99.44% identity (528/531 bp), and the 18S rRNA sequence showed 99.82% identity (568/569 bp) with those of Sphaerirostris lanceoides. Based on these morphological and molecular characteristics, the cystacanths were identified as S. lanceoides. This study represents the first record of S. lanceoides in Korea. © The Korean Society of Veterinary Clinics.

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