Paleontological studies on the placodermi and chondrichthyan remains from Japan

日本盾皮鱼和软骨鱼类遗骸的古生物学研究

基本信息

批准号：
03640658
负责人：
GOTO Masatoshi
金额：
$ 0.77万
依托单位：
Tsurumi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

1. Taxonomical, morphological and histological studies on the placodermi remains from Japan : The dermal armours which were discovered from the Hukuji Formation (Lower Devonian) in Hukuji, Kmitakara-mura, Gifu Prefecture, central Japan were described as spinal plates of Romundina sp., Acanthothoraci by the morphological and histological studies (Okura and Goto, 1992).2. Studies on the teeth of Mesozoic elasmobranchii : Tooth of Hybodus sp. from the Middle Triassic, Acrodus sp. from the Upper Triassic and Asteracanthus sp. from the Lower Jurassic of Japan were described (Goto et al., 1991).3. Evolutionary study on the form and structure of chondrichthyes : The morpology and histology of teeth in fossil and extant chondrichthyes were investigated. It can be considered that the tooth structure of Chondrichthyes is not dependent on their evolutionary level, but the result of an adaptation to their food habits (Goto, 1991).4. Palaeozoic and Early Mesozoic fish fauna in Japan : Based on the present data, the fossil fishes of the Palaeozoic and Early Mesozoic of Japan are classified into twenty-two genera and thirty-one species, that is, one species of placodermi (Lower Devonian), fifteen species of elasmobranchs (Permian-Jurassic), two species of cochliodonts (Permian), eleven species of petalodonts and two species of osteichthyes (Triassic) (Goto, 1992).5. Origin and evolution of skeletal tissues in vertebrates : The dermal armor (exoskeleton) of primitive agnathians which was formed as a mechanism for removing excess calcium from the blood changed to an organized functional support (endoskeleton) for the body of terrestrial vertebrates (Goto, 1991 ; 1992).

1. 日本盾皮鱼遗骸的分类学、形态学和组织学研究：在日本中部岐阜县克米塔卡拉村 Hukuji 的 Hukuji 组（下泥盆统）中发现的真皮甲被描述为 Romundina sp. 的脊椎板。，棘胸动物的形态学和组织学研究（Okura 和 Goto，1992）。2。中生代软骨鱼牙齿的研究：弓鲛属的牙齿。来自中三叠世，Acrodus sp。来自上三叠世和 Asteracanthus sp。描述了来自日本下侏罗统的（Goto 等人，1991）。3。软骨鱼形态和结构的进化研究：研究了化石和现存软骨鱼牙齿的形态学和组织学。可以认为，软骨鱼类的牙齿结构并不取决于其进化水平，而是其饮食习惯适应的结果(Goto，1991)。4．日本古生代和早中生代鱼类区系：根据现有资料，日本古生代和早中生代鱼类化石分为22属31种，即盾皮鱼（下泥盆统）1种, 十五种软骨鱼类（二叠纪-侏罗纪），两种齿齿动物（二叠纪），十一种瓣齿兽和两种骨鱼（三叠纪）（Goto，1992）5。脊椎动物骨骼组织的起源和进化：原始无颌动物的真皮甲（外骨骼）是作为从血液中去除多余钙的机制而形成的，转变为陆地脊椎动物身体的有组织的功能支持（内骨骼）（Goto，1991）；1992）。