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EVOLUTIONARY PALEOBIOLOGY OF CHAMBERED CEPHALOPDS

室状头足类动物的进化古生物学

基本信息

批准号：
61480028
负责人：
TANABE KAZUSHIGE
金额：
$ 4.16万
依托单位：
UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

Evolutionary paleobiological, aspects of modern and fossil chambered cephalopods were analyzed, with special reference to ammonites and modern Nautilus. As a result, the following lines of evidence were made clear.1. Wide variety of adaptive design for streamling among Cretaceous ammonites was suggested from vomparative shell shape analysis of many species from Hokkaido.2. Embryonic origin of ammonite juvenile shells (ammonitellas) was inferred from comparative SEM observation of microornament with other molluscan embryonic shells.3. Taphonomic process of ammonite death assemblages in the Upper Cretaceous of Hokkaido was considered from careful observation of mode of fossil occurrence.4. Feeding habits of ammonites were considered on the basis of comparative anatomy of jaw apparatuses of ammonites and modern Nautilus.5. Morphologic variation of soft and haed tissues in Nautilus pompilius was analyzed on the basis of specimens from the Philippines and Fiji, and its evolutionary and ecological implications were considered.

进化古生物学方面的现代和化石分室头足类动物进行了分析，特别是参考菊石和现代鹦鹉螺。结果，以下证据得到了明确。通过对北海道白垩纪菊石的吐出壳形态分析，提出了白垩纪菊石的多种适应性设计。通过与其他软体动物胚胎壳的微纹饰的扫描电镜对比观察，推测菊石幼壳（ammonitella）的胚胎起源.通过对北海道晚白垩世菊石死亡组合化石产出方式的观察，探讨了菊石死亡组合的埋藏过程.根据鹦鹉螺与现代鹦鹉螺的颚器比较解剖，探讨了鹦鹉螺的食性.以菲律宾和斐济的鹦鹉螺标本为基础，分析了鹦鹉螺软组织和硬组织的形态变异，并讨论了其进化和生态学意义。