Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Two new free-living marine nematodes of the genus Belbolla (Nematoda, Enoplida, Enchelidiidae) from a shallow subtidal benthic habitat of the outermost islands of Korea

  • Hyun Soo Rho (East Sea Environment Research Center, Korea Institute of Ocean Science and Technology) ;
  • Hyo Jin Lee (East Sea Environment Research Center, Korea Institute of Ocean Science and Technology) ;
  • Heegab Lee (East Sea Environment Research Center, Korea Institute of Ocean Science and Technology) ;
  • Chang Geun Choi (Department of Ecological Engineering, College of Environmental and Marine Technology, Pukyong National University)
  • Received : 2021.11.03
  • Accepted : 2021.11.12
  • Published : 2021.12.31
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Abstract

Two new free-living marine nematodes of the genus Belbolla Andrássy, 1973 belonging to family Enchelidiidae are newly described based on specimens obtained from a shallow subtidal sediment of the western and southern outermost islands of Korea. Belbolla koreensis sp. nov. differs from other species of the genus by the combination of the following characteristics: longer body length (3,080-3,462 ㎛ long), eight oesophageal bulbs in the posterior region of pharynx, well-developed two winged precloacal supplements (anterior precloacal supplement slightly longer than posterior one: 47-59 ㎛ vs. 43-46 ㎛ long), strongly arcuated, very thick, L-shaped spicule (122-127 ㎛ long, 1.7-1.9 anal body diameter(a.b.d.) long) with three separated blunt distal tips, and well-developed relatively long cylindrical shaped gubernacular apophysis with blunt teeth covering two thirds of the dorsal margin (57-58 ㎛ long, 0.8-0.9 a.b.d. long). Belbolla hoonsooi sp. nov. is characterized by the following combination of characteristics: longer body length (3,494 ㎛ long), eight oesophageal bulbs in the posterior region of pharynx, well-developed two winged precloacal supplements (anterior precloacal supplement slightly longer than posterior one: 43 ㎛ vs. 36 ㎛ long), strongly arcuated, L-shaped spicule (119 ㎛ long, 1.5 a.b.d. long) with three separated blunt distal tip, and well-developed relatively long inverted triangle shaped gubernacular apophysis with blunt teeth covering half of the dorsal margin (45 ㎛ long, 0.6 a.b.d. long). Detailed morphological characteristics and illustrations of two new Belbolla nematodes from the Korean seawaters were provided by differential interference contrast microscopy. Comparative tables on biogeographical and morphological characteristics of Belbolla species are also provided herein.

Keywords

Acknowledgement

The authors appreciate the anonymous reviewers for their helpful comments that greatly improved the manuscript. This research was supported by a grant from the National Marine Biodiversity Institute of Korea (2021M01100) and by the research projects of the Korea Institute of Ocean Science & Technology(PG52580, PE99913).

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