Ammonites as cartesian divers
Ammonites as cartesian divers
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菊石作为笛卡尔潜水员
作者：
A. Seilacher;M. Labarbera
如果菊石被建模为活跃的笛卡尔潜水员，其最后的隔膜保持橡胶状，未钙化的膜，直到下一个腔室周期开始，许多结构和埋藏不一致溶解。如果隔套的前颈内陷充当能够在环境压力或高于环境压力的情况下产生气体的腺体，那么后面的腔室可以像鱼鳔一样通过跨越隔套的缝合肌肉进行操作。其他的隔膜功能可能是进化的垫脚石，通往这种独特的设计。
Many constructional and taphonomic incongruencies dissolve if ammonites are modeled as active Cartesian divers, whose last septum remained a rubber-like, uncalcified membrane until the next chamber cycle began. If the prochoanitic invagination of the septal mantle served as a gas gland able to produce gas at or above ambient pressure, the chamber behind could be operated like a swim bladder by sutural muscles spanning across the septal mantle. Other septal functions probably served as evolutionary stepping stones on the way to this unique design.