Early life history of the eastern Korean tetraploid spined loach,iksookimia yongdokensis(Pisces: Cobitidae)

Abstract

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Comparative Morphology and Morphometry of the Olfactory Organ of the Six Korean Spined Loaches, Genus Iksookimia, as a New Taxonomic Key

“…Distinct from the related genus Cobitis with Gambetta's zones as a pigmentary zone on lateral body but sharing similar habitat (the middle to upper streams with gravels and sandy bottom), genera Iksookimia is currently classified into six endemic Korean species based on (i) geological distribution, and (ii) morphology (the lamina circularis as bony process or plate at the base of the first and second rays of the pectoral-fin and the body pigmentation) Park, 1997, 2002;Kim, 2009;Ko, 2015). The organisms in question also demonstrate different reproductive strategies in egg envelope structure (papilla, villi, grapevine, hillock, granule, unadorned form, and sawtooth-like form) in relation to the river bottom structure (Ekmekci and Erk'akan, 2003;Ko and Park, 2010), spawning character (Ko and Won, 2016), and early life history (Ko et al, 2017). These different adaptations of Iksookima are well-correlated with their geographical distribution and are a good example of allopatric speciation (Kim, 1997).…”