• Korean Journal of Ichthyology
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• v.1 no.1_2
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• pp.24-34
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• 1989

We reexamined the skulls of 14 gobionine genera of Korea to study taxonomic status of Gobioninae. The character transformation series found in the morphology of urohyal was very distinct among other skeletal characters. The gobioninae fishes of Korea were divided into 4 groups based on their morphology of urohyal as follows ; 1. Coreoleuciscus, Gnathopogon group ; The horizontal plate of urohyal has a ellipse shape with posterior edge wedged and the length is longer than that of vertical plate. 2. Hemibarbus, Squalidus group ; The horizontal plate has a elongated rhombeus shape with posterior edge pointed and the length is shorter than that of vertical plate. 3. Sarcocheilichthys, Pseudopungtungia, Pseudorasbora, Pungtungia group ; the horizontal plate has a expanded rhombeus shape, the length is longer than that of vertical plate, the hypohyal attatchment is not bifurcated, and the profile of the horizontal and vertical plate curved ventrally. 4. Ladislavia, Gobiobotia, Abbottina, Hicrophysogobio, Pseudogobio, Saurogobio group ; The horizontal plate has a pin or wedge shape expanded anteriorly, the length is shorter than that of vertical plate, and the hypohyal attatchment is thickened laterally. This results agreed with those by the adductor mandibulae complex, the geniohyoideus of cephalic muscles, and the cephalic-lateral line canals.

• Journal of the Korean earth science society
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• v.37 no.3
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• pp.133-142
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• 2016

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.

• Journal of the Korean earth science society
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• v.37 no.1
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• pp.1-10
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• 2016

Four entities of the Cenozoic fish fossils were discovered in the Miocene Duho Formation, Pohang, Korea. these fossils were identified as the first Pleuronectiformes in Korea based on the following-the presence of postcleithrum, the elongation of the first proximal pterygiophore of the anal fin ray, almost consistent presence of two proximal pterygiophore of the anal fin rays between the two adjacent hemal spines, the fusion of the first and second hypurals, the fusion of the third and fourth hypurals and the first preural centrum, the presence of well-developed anteriormost plate-like neural spine, the presence of the urohyal like fish-hook and its elongated sciatic part, and the division of the parahypural from the first preural centrum. On the other hand, geological studies about the Duho Formation consistently claimed that shallow-sea creatures were washed away by meteorological events such as a great flood and deposited at the bottom of deep-sea by the turbidity current. However, in Duho Formation, only shallow-sea ones have been discovered thus far. This study reported that Flat fish, deep-sea creature, was discovered in Duho Formation for the first time in Korea.

• Animal Systematics, Evolution and Diversity
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• v.6 no.1
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• pp.1-16
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• 1990

The skull and superficial cephalis muscles of Coreoleuciscus splendidus Mori was investigated comparatively with other some fishes of the family Cyprinidae to study on the systematic position of this species. Coreoleuciscs splendidus was unique in the morphology of sphenotic process and the urohyal and this species differ from the true bottom dwellers of the subfamily Gobioninae in the strucutre of cephalic lateral-line canals, the relation of parasphenoids with pterotic and prootic, the morphology of urohyal , basihyal , hypobranchial, and , particulary, the configuration of adductor manibulae complex. With reference to the information so far obtained , the taxonomic position of the present species was discussed in the Cyprinidae.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.5 no.4
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• pp.121-127
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• 1972

The present paper deals with the results of the comparative morphology on the urohyal bones on the right-eye flounders, pleuronectidae fishes in Korean waters. The results obtained are as follows : 1. The position of the tip of sciatic part is quite different depending on the genera and species of the fishes. The sciatic part of the genera, Platichthys and Cleisthenes, is very short extending to the middle portion of the main part. In the fishes of Eopsetta and Tanakius, it is also very short extending to the anterior 1/3 of the distance from the tip of main part. The fishes of Verasper and Dexistes have a short sciatic part which extends toward the posterior 1/4 of the distance from the tip of main part. The fishes Of Limanda, Clidoderma, Glyptecephalus and Microstomus have a long sciatic part which extends as long as the main part. However, those of Kareius and Pleuronichthys have a very long sciatic part extending twice long as the main part. The tip of sciatic part of the fishes belonging to Eopsetta, Verasper, Limanda, Platichthys, Tanakius and Glyptocephalus is a truncate form. It is pointed upward in the fishes of Kareius, Pleuronichthys, Clidoderma and Microstomus, but pointed forward in Cleisthenes and Dexistes. 2. The size and form of the cardiac apophysis vary with the developmental grades of the urohyal bone. The fishes of Eopsetta, Verasper, Platichthys, Tanakius, Kareius and Dexistes possess relatively large apophyses and those of Pleuronichthys and Clidoderma have small apophyses. Intermediate size of the apophysis is found in the fishes of Limanda, Microstomus and Cleisthenes. A long and barlike apophysis is found in Glyptocephalus. Three kinds of the cardiac. apophysis are found in the fishes examined, i. e., lateral wing in Eopsette, Verasper, Limanda, Platichthys, Tanakius, Glyptocephalus, Kareius, Pleuronichthys and Clidoderma, pointed forward in Microstomus and Cleisthenes, and truncate with a well-developed inner ridge type in Dexistes. 3. The angle of the main part and sciatic part varies from 30 to 60 degrees in the fishes studied except for the fishes of Pleuronichthys, Clidoderma and Microstomus which show a semi-elliptical form.

• Development and Reproduction
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• v.24 no.2
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• pp.125-133
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• 2020

This study is intended to be used as the basic material for the taxonomic research by observing the stages of skeletal development of Luciogobius grandis larvae compared to the skeletal development patterns of the same fish family of Gobiidae. 3 days after hatching (DAH), the preflexion larvae was 4.01±0.11 mm (n=5) in average total length (TL) and the frontal began to ossify in the skull. 17 DAH, the advanced postflexion larvae was 5.37±0.05 mm (n=5) in average TL the supraoccipital and epiotic were ossified in the cranial bone. 36 DAH, the juvenile was 12.2±0.20 mm (n=5) in average TL and the urohyal was ossified in the hyoid arch. In addition to one hypural bone being ossified, the first, second, third and fourth were combined and were made three bone fragments and then, the bone ossification of all skeletons was completed.

• Korean Journal of Ichthyology
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• v.9 no.1
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• pp.130-140
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• 1997

The osteological features of Rhodeus uyekii were examined. In this study, the detailed descriptions of cranium, vertebra and fin skeleton of Rhodeus uyekii are presented. R. uyekii had the following characteristics ; there was no fontanell in the cranium ; there was no process of supraethmoid ; the free interneural spine was large and flat ; the dorsal process of the supraoccipital was high and triangular ; the fourth infraorbital was reduced ; in the urohyal, the hypohyal attachment is bifurcated, the horizontal and vertical plate has a elongated rhombus shape with posterior edge pointed ; there was no coracoid foramen in the shoulder girdle ; there was no uroneural in the first preural centrum.

• Korean Journal of Ichthyology
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• v.13 no.1
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• pp.50-62
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• 2001

Osteological characteristics of skull, shoulder girdle, pelvic girdle, vertebrae, and pterygiophore of the four members of the genus Acanthogobius are described and compared. Characteristics of the metaterygoid, branchiostegals, urohyal, scapular, and pterygiophores that have been used to classify gobioid fishes were not different between the four species. However, ossification of the lacrymal and the number of ossified gill rakers differ from one Acanthogobius species to another. A. flavimanus is distinguished from its congeners in the size of the medial ethmoid, the number of caudal vertebrae, and the distance from left to right lateral ethmoid. A. lactipes has a large basihyal, and A. luridus has a wide distance from left to right lateral ethmoid: these are among the unique characters that distinguish them from other members of the genus. A. elongata differs notably from its congeners in the number of premaxillary and dentary teeth, the shape of the epural, and the length of the cranium.

• Korean Journal of Ichthyology
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• v.10 no.2
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• pp.231-240
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• 1998

The characteristics of cranium, vertebral column and fin supports of Acanthorhodeus gracilis were examined. The fish did not have a fontanell in cranium nor process of supraethmoid. It had double orbitosphenoids and a basioccipital process developed from anterior portion of basioccipital. It had a high and triangular dorsal process on supraoccipital. In the urohyal, hypohyal attachment was bifurcated and horizontal and vertical plate were in an elongated rhombus shape with posterior edge pointed. It had teeth of 1-rowed, 5/5 and 4 free teeth. The fish did not have a coracoid foramen on shoulder girdle. It does not have a uroneural on ural centrum. It had a long and slender posterior process of pelvic bone. It had a large and flat supraneural. The fish had 14 or 15 interneural spines, of which the 1st, 2nd, 3rd and 4th had single basiosts and the rest had double basiosts. It had 11 or 12 interhemal spines, of which the 1st, 2nd, 3rd and 4th had single basiosts and the rest had double basiosts.