The Natural History Museum, Department of Zoology, Cromwell Road, London, United Kingdom.
J Exp Zool B Mol Dev Evol. 2011 Jan 15;316(1):10-20. doi: 10.1002/jez.b.21375.
The morphological diversity of fishes provides a rich source to address questions regarding the evolution of complex and novel forms. The Tetraodontiformes represent an order of highly derived teleosts including fishes, such as the pelagic ocean sunfishes, triggerfishes, and pufferfishes. This makes the order attractive for comparative analyses to understand the role of development in generating new forms during evolution. The adductor mandibulae complex, the main muscle associated with jaw closure, represents an ideal model system within the Tetraodontiformes. The adductor mandibulae differs in terms of partitions and their attachment sites between members of the different tetraodontiform families. In order to understand the evolution of the jaws among the Tetraodontiformes, we investigate the development of the adductor mandibulae in pufferfishes and triggerfishes as representatives of two different suborders (Balistoidei and Tetraodontoidei) that follows two different adaptations to a durophagous feeding mode. We show that the varied patterns of the adductor mandibulae derive from similar developmental sequence of subdivision of the partitions. We propose a conserved developmental program for partitioning of the adductor mandibulae as a foundation for the evolution of different patterns of subdivisions in Tetraodontiformes. Furthermore, we argue that derived conditions in the higher taxa are realized by supplementary subdivisions and altered attachment sites. These findings support a reinterpretation of homology of different muscle partitions among the Tetraodontiformes, as muscle partitions previously thought to be disparate, are now clearly related.
鱼类的形态多样性为解决有关复杂和新颖形态进化的问题提供了丰富的资源。四齿目代表了一类高度特化的硬骨鱼，包括大洋中上层的翻车鱼、扳机鱼和河豚等鱼类。这使得该目成为进行比较分析以了解在进化过程中发育在产生新形态中的作用的理想选择。下颌肌复合体是与下颌闭合相关的主要肌肉，它是四齿目内的理想模型系统。下颌肌在不同四齿目科的成员之间，在分区及其附着部位方面存在差异。为了了解四齿目鱼类的颌骨进化，我们研究了河豚和扳机鱼的下颌肌发育，它们分别代表了两种不同亚目的代表（鲀亚目和四齿鲀亚目），它们适应了不同的硬骨食性进食方式。我们表明，下颌肌的不同模式源于分区细分的相似发育序列。我们提出了一个下颌肌分区的保守发育程序，作为四齿目不同分区模式进化的基础。此外，我们认为高等分类群中的衍生条件是通过补充分区和改变附着部位来实现的。这些发现支持了对四齿目不同肌肉分区同源性的重新解释，因为以前被认为不同的肌肉分区现在显然是相关的。
