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Development of Pharyngeal Dentition in the Cobitid Fishes, Misgurnus anguillicaudatus and Cobitis biwae, with a Consideration of Evolution of Cypriniform Dentitions

Tsuneo Nakajima
Copeia
Vol. 1987, No. 1 (Feb. 11, 1987), pp. 208-213
DOI: 10.2307/1446055
Stable URL: http://www.jstor.org/stable/1446055
Page Count: 6
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Development of Pharyngeal Dentition in the Cobitid Fishes, Misgurnus anguillicaudatus and Cobitis biwae, with a Consideration of Evolution of Cypriniform Dentitions
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Abstract

Development of pharyngeal dentition was observed for two cobitid fishes, Misgurnus anguillicaudatus and Cobitis biwae. Only one tooth ankylosed to the bone in the earliest dentition, whereas two teeth on the following replacement wave ankylosed at the anterior and posterior positions. The dentition then develops with alternate sweeping of even and odd replacement waves. The teeth increase posteriorly in number by one during the odd replacement wave. Number of tooth positions in the major row is established by the early juvenile period in cyprinids, but increases throughout the juvenile period in cobitids. Shapes of pharyngeal bones seem to be reflected in the dentitions. Observations of development lead to the conclusion that the cobitid and cyprinid dentitions were not derived one from the other, and that the cobitid dentition is more closely related to catostomid dentition than to cyprinid dentition.

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