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

9510735 迪迪埃 本研究的目的是确定化石和现生嵌合体鱼类之间的系统发育关系。 这项研究的重点是颌骨、头骨、鳃弓和牙列的肌肉骨骼特征。该分析将检查29个活的分类群，加上目前未知数量的不明物种，以及9个嵌合体化石分类群，以及两个外类群，一个鲨鱼和一个溜冰鞋。使用各种形态学准备获得数据，包括解剖、骨骼准备、清洁和染色以及组织学。形态特征进行分析，并在活的和化石分类群评分，并使用计算机算法PAUP（系统发育分析使用简约）生成和分析的系统发育。 %%% 形态学和古生物学信息的综合是该谱系的第一个种水平系统发育分析。至少有10个新种的描述和一个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成果。在这个系统发育的背景下，发现新的套房的字符相关的下巴，头骨和鳃弓形态将有助于重要的基线解剖信息，了解早期脊椎动物之间的下巴悬挂机制的进化和辐射。 ***

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. ***