Paedomorphic features and allometric growth in the skull of Elephas falconeri from Spinagallo (Middle Pleistocene, Sicily)
Paedomorphic features and allometric growth in the skull of Elephas falconeri from Spinagallo (Middle Pleistocene, Sicily)
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Spinagallo（中更新世，西西里岛）的 Elephas falconeri 头骨的幼体特征和异速生长
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. R. Palombo
中科院分区：
文献类型：
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作者：
M. R. Palombo
总结：在1867年的《大象》（elephant has falconeri Busk）中，头骨的特殊特征源于脑部的广泛发育。当颅骨体积非常小时，这对于维持最小的脑功能容量是必要的。因此，呼吸轴向前和向下倾斜。这一特征决定了外choaae的低位置和颅脑的所有形态，特别是前额的延伸。另一方面，上颌和上颌前骨的负异速生长，决定了面部区域的比例减少。幼象标本，特别是象和象齿象的幼象，其颅骨形态与成年象的成年颅骨非常相似。
SUMMARY: In Elephas falconeri Busk, 1867, the peculiar features of the skull derive from the extensive development of the brain case. This is necessary to maintain a minimal functional volume of the brain when the size of the skull is very reduced. Therefore, the respiratory axis acquires a forward and downward inclination. This feature determines the low position of the external choanae and all the morphology of the braincase, especially the extension of the forehead. On the other hand, the negative allometric growth of the anterior part of the maxillary and premaxillary bones, determines a proportional reduction of the facial region. Juvenile elephant specimens, especially those of Elephas and Loxodonta, exhibit a skull morphology very similar to that of adult skulls of E. falconeri.