Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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The Morphology and Morphometry of the Olfactory Organ of Southern King Spine Loach, Iksookimia hugowolfeldi (Cypriniformes, Cobitidae)

한국고유종 남방종개 Iksookimia hugowolfeldi 후각기관의 형태 및 형태계측학적 연구

  • Kim, Hyun Tae (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Jeonbuk National University) ;
  • Park, Jong Young (Department of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Jeonbuk National University)
  • 김현태 (전북대학교 자연과학대학 생명과학과, 전북대학교 부설 생물다양성연구소) ;
  • 박종영 (전북대학교 자연과학대학 생명과학과, 전북대학교 부설 생물다양성연구소)
  • Received : 2020.04.28
  • Accepted : 2020.06.15
  • Published : 2020.06.30
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Abstract

The morphometry and morphology of the olfactory organ of the southern king spine loach Iksookimia hugowolfeldi were investigated by stereo microscopy and statistical analysis. Its external morphology consists of two holes, the anterior and posterior nostrils. The anterior nostril (0.35~0.53 mm in diameter) forms tubular process protruding vertically from each side of the snout. The posterior nostril (0.32~0.68 mm in major diameter) is a eye-like hole parallel to the skin. Internally, the rosette structure is set with 14 to 21 lamellae and medium raphe on the inner floor. In morphometry, its lamellar number (male vs. female; 18±1.8 vs. 17±1.6, P<0.05) and lamellar number to standard length ratio (24.2±1.3% vs. 21.7±2.5%, P<0.05) was larger in male than female. The lamellar number and standard length have high correlation in male (P<0.001) but not in female (P=0.170). It seems that such characteristics of the olfactory organ of I. hugowolfeldi are related to its bottom-dwelling life which digs and takes a rest under sand and sexual dimorphism by a distinct degree in olfactory dependence for reproduction of each sex.

한국 고유종 남방종개 Iksookimia hugowolfeldi 후각기관의 형태 및 형태계측학적 특징을 확인하기 위해 실체 현미경을 이용하여 관찰하고 통계프로그램 SPSS로 분석하였다. 후각 기관의 외부 형태는 주둥이 좌우로 돌출된 튜브형의 전비공(직경 0.35~0.53 mm)과 눈모양의 후비공(장축 0.32~0.68 mm)으로 구성된다. 후각기관 내부에서는 14~21개의 후판으로 구성된 로제트 구조가 확인된다. 형태계측학적 분석에서 후판개수(수컷 vs. 암컷, 18±1.8 vs. 17±1.6)와 체장대비 후판개수 비율(24.2±1.3% vs. 21.7±2.5%)은 수컷이 암컷보다 더 높은 값을 나타냈다. 체장과 후판은 수컷에서 유의미한 상관관계(P<0.001)를 나타냈다. 이와 같은 남방종개의 후각기관 특징은 서식처 바닥의 모래를 파고 숨는 저서성 생활의 적응과 암수 간 생식에서의 후각의존성 차이를 반영하는 결과로 사료된다.

Keywords

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