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http://dx.doi.org/10.35399/ISK.32.2.2

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

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)
Publication Information
Korean Journal of Ichthyology / v.32, no.2, 2020 , pp. 49-54 More about this Journal
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.
Keywords
Tubular nostril; protruding direction; olfactory lamellae; number; sexual dimorphism;
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