Mississippian Fossil Tetrapods from Midcontinental North America and Early-Tetrapod Phylogeny

北美中部大陆的密西西比四足动物化石和早期四足动物系统发育

• 批准号: 9306294
• 负责人: John Bolt
• 金额: $ 12万
• 依托单位: Field Museum of Natural History
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-15 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9306294&HistoricalAwards=false
• 关键词: Mississippian; Fossil; Tetrapods; Midcontinental; North

9306294 Bolt This research involves an investigation of morphological variation in protoanthracosaur tetrapods from Paleozoic sites in Delta, Iowa, and Goreville, Illinois. New fossil materials will be prepared, specimens will be described, and new specimens will be named and illustrated. The preparation and description of this material will increase by approximately 25% the number of known Mississippian tetrapod genera. %%% The morphology and relationships of the earliest tetrapods are poorly understood at present largely because there are few well preserved and well prepared specimens available for study. Furthermore, some of the best represented early tetrapod groups are highly derived morphologically. The Delta fossils are the oldest terrestrial vetebrates ever found in the United States and among the oldest in the world, as no more than a dozen localities are known to be of equal or greater age. Both the Delta and Goreville sites have produced exceptionally well preserved species of terrestrial animals. The age, exceptional preservation, diversity and abundance of specimens at both sites provide an extraordinary opportunity to learn about early terrestrial vertebrates and morphological diversification among vertebrate lineages.

小行星9306294 本研究涉及的形态变异的原炭疽龙四足动物从三角洲，爱荷华州，戈尔维尔，伊利诺伊州古生代网站的调查。 新的化石材料将准备，标本将被描述，新的标本将被命名和说明。 这些材料的制备和描述将使已知的密西西比四足动物属的数量增加约25%。最早的四足动物的形态和关系目前还不太清楚，主要是因为很少有保存完好的标本可供研究。 此外，一些最具代表性的早期四足动物群在形态上高度衍生。 三角洲化石是在美国发现的最古老的陆生脊椎动物，也是世界上最古老的脊椎动物之一，因为已知不超过12个地方的年龄相等或更大。 三角洲和戈尔维尔遗址都产生了保存非常完好的陆生动物物种。 这两个地点标本的年龄、特殊的保存、多样性和丰富性为了解早期陆生脊椎动物和脊椎动物谱系的形态多样性提供了一个非凡的机会。