稀有鮈鲫咽齿个体发生的研究

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THE DkVELOPMENT OF THE PHARYNGEAL DENTITION IN A CYPRINID,GOBIOCYPRIS RARUS FU ET YE

摘要: 稀有鮈鲫是一种2,4-4,2齿式的小型鲤科鱼类,通过对其胚后发育连续材料的观察,作者认为;1.成体中咽齿的副行齿是遗留的早期替换齿;2.成体中排成一行的主行齿实际分属两代齿,其替换过程与幼体中齿的替换无本质上的差别;3.整个咽齿的替换过程可用Edmund的齿序理论和Osborn的假设共同解释.

Abstract: Gobiocypris rarus is a small cyprinid fish bearing the pharyngeal teeth of formal 2.4-4.2. The development of pharyngeal dentition in this species was oberved using larvae of successive stages. Pharyngeal teeth on the minor row in the adult was found to be the remnantsof the earlier replacement teeth. Teeth on the major row, arranged in a line, are of two generations.The process of dental replacement are similar in the adults and in the larva1,and canbe accounted for and interpreted by Edmnud's Zahnreihe theory and Osborn's hypothesis.