Tsessarsky A A
Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071, Moscow, Russia.
Dokl Biol Sci. 2019 May;486(1):76-78. doi: 10.1134/S0012496619030037. Epub 2019 Jul 17.
The transitory dermal infoldings are described for the first time in front and behind the upper jaw in the larvae and postlarvae of the American paddlefish, Polyodon spathula Walbaum, 1858. In sturgeons these infoldings are necessary for the jaw protraction. In the paddlefishes, they, probably recapitulate the ancestral state. At the same time, the presence of these folds at the larval stages might indicate that the paddlefish larvae possess the protractive jaws. Further developmental studies of the jaw kinematics in Polyodon spathula are needed to test both hypotheses.
首次描述了1858年美国匙吻鲟（Polyodon spathula Walbaum）幼鱼和后期幼鱼上颌前后的暂时性皮肤褶皱。在鲟鱼中，这些褶皱对于颌骨前伸是必要的。在匙吻鲟中，它们可能重现了祖先的状态。同时，这些褶皱在幼体阶段的存在可能表明匙吻鲟幼体具有可前伸的颌骨。需要对匙吻鲟的颌骨运动学进行进一步的发育研究来验证这两个假设。
