The Appearance Pattern of Tooth Germs in the Round Crucian Carp, Carassius auratus grandoculis.

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Cyprinid fishes generally replace their teeth alternately and cephalad. The larvae of Carassius auratus grandoculis also replace their teeth alternately and cephalad, in a pattern of 4-2-3-1-. However, adults of Carassius species replace their teeth from anterior to posterior, in a pattern of 1-2-3-4-1-. So I analyzed the appearance pattern of tooth germs in larvae and juveniles in Carassius auratus grandoculis. At stage 5 of the post-larval period, developmental difference is made between both sides. In the pharyngeal dentition on one side developing poorly, the anterior tooth on the fifth replacement wave, tooth 4 [An2] appeared later than the central teeth on following replacement wave, tooth 5 [Po1]. Moreover, the anterior tooth on the seventh replacement wave, tooth 6 [An2], appeared later than the central teeth on the following replacement wave, tooth 7 [Po1], on both sides. The reverse of tooth germ appearance between anterior teeth and central teeth makes a change of replacement pattern from 4-2-3-1-4- to 1-2-3-4-1-. The change of replacement pattern is caused by the confusion of tooth germs of anterior teeth on both sides. Mylopharyngodon piceus and Cyprinus carpio make a change of replacement patterns in the early juvenile period, too. This change of replacement pattern may be a specialized character among the subfamily Cyprininae.
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