Animal Systematics, Evolution and Diversity

The Korean Society of Systematic Zoology (한국동물분류학회)
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First Report of Five Tobrilus Species (Nematoda: Triplonchida) from Korea

  • Kim, Jiyeon (Animal & Plant Research Department, Nakdonggang National Institute of Biological Resources) ;
  • Kim, Taeho (Division of EcoScience, Ewha Womans University) ;
  • Yu, Jeong-Nam (Animal & Plant Research Department, Nakdonggang National Institute of Biological Resources) ;
  • Park, Joong-Ki (Division of EcoScience, Ewha Womans University)
  • Received : 2019.11.13
  • Accepted : 2020.07.11
  • Published : 2020.07.31
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Abstract

Member of the genus Tobrilus Andrássy, 1959, which belongs to Tobrilidae Filipjev, 1918, are known as free-living nematodes in freshwater habitat. This genus was previously unknown from Korea. Five Tobrilus species are here reported for the first time from Korea: Tobrilus aberrans (Schneider, 1925), Tobrilus diversipapillatus (Daday, 1905), Tobrilus gracilis (Bastian, 1865), Tobrilus longus (Leidy, 1851), and Tobrilus wesenbergi (Micoletzky, 1925). Specimens were collected from sediments of the Nakdong River in Korea. Morphological characters and measurements of the specimens generally agree with the original descriptions of Tobrilus species, except for some differences that can be attributed to intraspecific variation among populations(e.g., nerve ring position [% pharynx] and reproductive length). Each species can be distinguished from other members of the genus by specific characters (e.g., cephalic setae length and position, buccal cavity and pocket shape, vulva position, degree of development of reproductive system, and tail length and shape). Here, five species in the genus Tobrilus are fully redescribed and illustrated using optical microscopy images. DNA barcode sequence information (the D2-D3 region of 28S rDNA) is also provided for molecular species identification.

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References

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