Evolutionary patterns of Carboniferous coleoid cephalopods based on their diversity and morphological plasticity
Evolutionary patterns of Carboniferous coleoid cephalopods based on their diversity and morphological plasticity
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基于多样性和形态可塑性的石炭纪鞘状头足类动物的进化模式
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发表时间：
2010
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影响因子：
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通讯作者：
H. Mutvei
中科院分区：
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作者：
L. Doguzhaeva;R. Mapes;H. Mutvei
通过对石炭纪鞘翅目的形态特征分析，发现了鞘翅目头足类早期演化过程中不同特征的重复组合。石炭纪早期鞘翅目演化的特点是：（1）“老”与“新”形态特征的复杂镶嵌组合;（2）新形态特征的平行出现和变异;（3）基本形态的相对快速变化。镶嵌组合的例子是Donovaniconus，它拥有体腔（杆状性状），原介层样结构（新奇）和墨囊（鞘状性状），或Mutveiconites，它结合了体腔（杆状性状）和喙（鞘状性状）。新奇或新特征可以出现在任何进化阶段，但“旧”特征可以在另一种形式的新奇出现后继续存在很长一段时间。这种现象的一个例子是在下石炭纪（约2000年）身体室的进化损失。325 MY）分类单元Hematites，这是最早记录的鞘翅目，以及在晚石炭纪（约325 MY）的体腔保留。290 MY）taxa Shimanskya，Mutveiconites，Donovaniconus，and Saundersites.新的形态特征的平行外观说明了出现在早石炭世的赤铁矿和帽状的小松散的钙化喙在晚石炭世Mutveiconites的发展的块状喙。
The morphological traits of the Carboniferous coleoids were analyzed to discover re-occurring combinations of different characteristic features during the early evolution of coleoid cephalopods. The early coleoid evolution in the Carboniferous is characterized by (1) a complex mosaic combination of the "old" and "new" morphological traits, (2) the parallel appearance and variations of new morphological features, and (3) relatively rapid changes in basic morphology. A mosaic combination is exemplified with Donovaniconus, which possesses a body chamber (bactritoid trait), a pro-ostracum-like structure (a novelty), and an ink sac (coleoid trait), or Mutveiconites, which combines a body chamber (bactritoid trait) and a rostrum (coleoid trait). A novelty or new feature can appear at any evolutionary stage, but "old" traits can continue to exist for a long period after the appearance of a novelty in another form. An example of this phenomenon is demonstrated by the evolutionary loss of the body chamber in the Lower Carboniferous (ca. 325 MY) taxon Hematites, which is the earliest recorded coleoid, and the retention of the body chamber in the Late Carboniferous (ca. 290 MY) taxa Shimanskya, Mutveiconites, Donovaniconus, and Saundersites. The parallel appearance of new morphological traits is illustrated by the appearance of the massive rostrum in the Early Carboniferous Hematites and the development of a cap-like small loosely calcified rostrum in the Late Carboniferous Mutveiconites.