Growth and Replacement of Dentary Teeth in the Smelt, Hypomesus transpacificus nipponensis

概要

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Thirteen juvenile, 40 young and 40 adult smelt were collected in 1979 and 1980. The body size was expressed in standard length (SL). All specimens were stained with alizarin red S. The length of the whole tooth row and the individual tooth length increased with body length until the adult stage. The total number of teeth and that of toothgerms in smelt of 55-65 mm and 65-75 mm SL were significantly fewer than tuose of 45-55 mm and 75-85 mm SL. The frequencies of individuals having loci in which functional teeth had been lost were 16%, 33% and 29% in smelt 45-55 mm, 55-65 mm and 65-75 mm SL, respectively. There was no individual having loci in the 30-40 mm SL and 75-85 mm SL groups. The formation of toothgerms and the loss of teeth are thus associated with body length. On the other hand, there was no clear relationship between the position of the toothgerms and that of the loci of the lost teeth in the tooth row on the dentary. The patterns of tooth replacement seemed to be irregular and varied between the different bones of the jaw. The present results did not support the Zahnreihe concept by Edmund (1960); tooth replacement in the bony fish is mote complicated than postulated by this concept. Rather, it seemed to support Osborn's (1971) hypothesis in the lizard.
社団法人日本動物学会の論文
1983-03-25