Evolution and adaptive radiation of dog-fish sharks (Chondrichthyes, Squaliformes)

关于角鲨的相互关系和进化的讨论一直存在争议，它们在深海中受到辐射的过程也是未知的。角鲨分布广泛，是一种单系鲨鱼，化石记录可以追溯到早白垩纪。他们的化石记录几乎完全由孤立的牙齿组成，只有少数来自黎巴嫩晚白垩纪的骨骼遗骸。在这项研究中，现存的和化石类的系统发育是第一次使用牙齿，分生和分子数据的组合重新检查。虽然单独的数据集显示了在类群内重建系统发育关系的高潜力，但迄今为止还没有对单个数据集组合的潜力进行详细的研究。将利用现代技术分析选定物种群（例如，狐尾科、角鲨科）的辐射，以便更好地了解适应和物种形成事件背后的过程的时间和模式，并开发与其他群体（例如，深水狐尾鲨）相关的一般模型。

The interrelationships and evolution of squaliform sharks are controversially discussed and the processes underlying their radiation in the deep-sea are unknown. Squaliform sharks are wide-spread and constitute a monophyletic group with a fossil record ranging back into the Early Cretaceous. Their fossil record consists almost completely of isolated teeth, only few skeletal remains are known from the Lebanese Late Cretaceous. In this study, the phylogeny of extant and fossil squaliforms is re-examined for the first time using a combination of dental, meristic, and molecular data. Although the separate data sets display high potential for reconstructing phylogenetic relationships within squaliforms, no detailed study concerning the potential of individual data sets in combination has been carried out so far. The radiation of selected speciose groups (e.g., Etmopteridae, Squalidae) will be analysed with modern techniques for gaining better insights into the timing and pattern of processes underlying adaptation and speciation events and to develop general models with relevance to other groups e.g., deep-water carcharhiniform sharks.