Systematics and Taxonomic Revision of Chimaeroids: Towards an Understanding of the Radiation of Jaws in Vertebrates

9510735 Didier这项研究的目的是确定化石和现存嵌合体鱼类之间的系统发育关系。这项研究集中在颌骨、头骨、颧弓和牙列的肌肉骨骼特征。这项分析将研究29个活的分类群，加上目前未知数量的未知物种，以及9个嵌合体化石分类群，以及两个外群分类群，一只鲨鱼和一只溜冰。数据是通过各种形态准备获得的，包括解剖、骨骼准备、清洁和染色以及组织学。对活的和化石的分类群的形态特征进行分析和评分，并使用计算机算法PAUP(使用简约的系统发育分析)生成和分析系统发育图。形态和古生物信息的综合是该谱系的第一个物种水平的系统发育分析。至少10个新种的描述和早就应该进行的嵌合体鱼类的分类修订是这项工作的两个重要结果。在这种系统发育的背景下，与颌骨、头骨和颧弓形态相关的新特征的发现将为理解早期脊椎动物颌骨悬吊机制的进化和辐射提供重要的基础解剖学信息。***

9510735 Didier The purpose od this research is to determine phylogenetic relationships among fossil and living chimaeroid fishes. This research focuses on musculoskeletal features of the jaws, skull, gill arches, and dentition. The analysis will examine 29 living taxa, plus a presently unknown number of unidentified species, and 9 fossil taxa of chimaeroids in addition to two outgroup tax, one shark and one skate. Data is obtained using a variety of morphological preparations including dissection, skeletal preparation, cleaning and staining, and histology. Morphological characters are analyzed and scored in living and fossil taxa, and phylogenies generated and analyzed using the computer algorithm PAUP (Phylogenetic Analysis Using Parsimony). %%% The synthesis of morphological and paleontological information is the first species level phylogenetic analysis of this lineage. The description of at least 10 new species and a long overdue taxonomic revision of chimaeroid fishes are two important results of this work. Within this phylogenetic context, the discovery of new suites of characters related to jaw, skull and gill arch morphology will contribute important baseline anatomical information towards understanding the evolution and radiation of jaw suspensory mechanisms among early vertebrates. ***