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The Structures of Feeding Organs in Two Korean Ricefishes (Pisces, Adrianichthyidae), Oryzias latipes and O. sinensis  

Kim, Hyun-Tae (Faculty of Biological Science and Institute for Biodiversity, College of Natural Science, Chonbuk National University)
Kim, Jae-Goo (Faculty of Biological Science and Institute for Biodiversity, College of Natural Science, Chonbuk National University)
Park, Jong-Young (Faculty of Biological Science and Institute for Biodiversity, College of Natural Science, Chonbuk National University)
Publication Information
Korean Journal of Ichthyology / v.24, no.4, 2012 , pp. 247-252 More about this Journal
Abstract
Structure on the feeding organs in two Korean ricefishes, Oryzias latipes and O. sinensis, was examined in the jaws and the teeth. In the jaw, O. latipes has a dent on the dorsal edge of distal arm of premaxilla (vs. straight in O. sinensis) and a alveolar arm of premaxilla running in straight line with distal arm of premaxilla (vs. ventra line in O. sinensis). O. latipes has also a dent on the posterior edge of dentary which is connected to coronoid process of dentary (vs. straight in O. sinensis). Large teeth developing only in the male, which is sexual dimorphism, developed into outside direction of the mandible in O. latipes (vs. dorsal direction in O. sinensis). In the teeth forms, O. latipes has two types (conical type and arrowhead type), whereas O. sinensis has only one type (conical type). Through this study, we confirmed that two Korean ricefishes show distinctive characteristics in the structure of the feeding organs.
Keywords
Oryzias latipes; Oryzias sinensis; feeding organs; sexual dimorphism;
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