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http://dx.doi.org/10.5467/JKESS.2016.37.3.133

Pleuronichthys sp. Fossils (Pleuronectidae) from the Duho Formation, Pohang Uhyeon-dong in Korea  

Ko, Ju-Yeong (Seoul Paleoecology Laboratory)
Nam, Kye-Soo (Daejeon Science High School for the Gifted)
Publication Information
Journal of the Korean earth science society / v.37, no.3, 2016 , pp. 133-142 More about this Journal
Abstract
Two specimens of the Cenozoic fish fossils were discovered from the Miocene Duho Formation of Uhyeon-dong, Pohang, Korea. These fossils are identified as Pleuronichthys sp. based on the following- firstly, front dorsal fin rays elongated to the upper part of neurocranium, Secondly, right sided orbit of neurocranium, Thirdly, presence of urohyal like fish-hook, Fourthly, curved sciatic part of the urohyal, Fifthly, presence of postcleithrum, Sixthly, over 27 centrum, Seventhly, elongated first pterygiophore of the anal fin rays, Eightly, c-shaped inner side of urohyal, Ninthly, small or few cardiac apophysis, and Tenthly, presence of many spots on body. These fossils of Pleuronichthys represent the first record in East-Asia. Two specimens are anatomically different in the extent of the asymmetry and the flatness of skull. This represents the unique ontogeny stage of the Pleuronectidae, because they accompany the above anatomical difference when they transform from pelagic lifestyle to benthic lifestyle.
Keywords
Pleuronichthys; Ontogeny; Pleuronectidae; Duho Formation; Cenozoic fish;
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