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The Development and Replacement Pattern of the Pharyngeal Dentition in the Japanese Cyprinid Fish, Gnathopogon coerulescens

Tsuneo Nakajima
Copeia
Vol. 1979, No. 1 (Feb. 20, 1979), pp. 22-28
DOI: 10.2307/1443724
Stable URL: http://www.jstor.org/stable/1443724
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Development and Replacement Pattern of the Pharyngeal Dentition in the Japanese Cyprinid Fish, Gnathopogon coerulescens
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Abstract

The larval dentition differs from the adult dentition, which is complete at an early stage of the juvenile period. The minor row (row B) is not formed during the larval period. The tooth germs always appear medial to the functioning tooth row, and the multi-rowed dentition is formed by the rows of the younger replacement teeth and the older functioning teeth in the larval dentition. The sequence of the attachment of the earliest teeth, which are formed at Stage 3, to the pharyngeal bone of larva was 4-5-3 (these numbers correspond to tooth positions of the major row in the adult phase). Subsequently, tooth germs appeared in the order 4-2-5-3-1-4-2. It is maintained in the major row (row A) of the adult dentition. In the row, the teeth were replaced in a cyclic order 5-3-1-4-2. This replacement wave progresses alternately and cephalad, and the pattern is similar to that of the jaw tooth replacement in many reptiles.

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