The origin of cephalopods inferred from shell structure, ontogeny and anatomy

从壳结构、个体发育和解剖学推断头足类的起源

• 批准号: 20540455
• 负责人: SASAKI Takenori
• 金额: $ 2.83万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20540455/
• 关键词: 系統; 進化; 多様性

The consequences of our research include four main topics. (1) Apomorphic or plesiomorphic characters were determined in "living fossil" Nautilus pompilius by comparing characters states of Nautilus with those of other cephalopods and molluscs. (2) Based on ontogenetic data on Nautilus embryo, a new hypothesis was proposed concerning the origin of cephalopod body plan from a primitive conchiferan stage. (3) High diversity of modern-type coleoidean cephalopods in the Cretaceous was revealed by detailed examinations of fossil jaws. (4) The cause of the end-Cretaceous extinction in ammonoids was inferred to be a decline of primary producers in the ocean.

我们的研究结果包括四个主要主题。(1)通过比较鹦鹉螺与其他头足类和软体动物的性状状态，确定了“活化石”庞氏鹦鹉螺的形态特征。(2)根据鹦鹉螺胚胎的个体发育资料，提出了头足类体平面起源于原始贝壳类阶段的新假说。(3)通过对颌骨化石的详细研究，我们发现白垩纪现代鞘翅目头足类具有高度的多样性。(4)白垩纪末菊石灭绝的原因被推断为海洋初级生产者的减少。

项目成果

貝類学

软体动物学

• 发表时间: 2010
• 作者: Raimbourg;H.;Shibata;T.;Yamaguchi;A.;Yamaguchi;H. and G;Kimura;佐々木猛智
• 通讯作者: 佐々木猛智

Microstructure and mineralogy of the outer calcareous layer in the lower jaws of Cretaceous Tetragonitoidea and Desmoceratoidea (Ammonoidea)

白垩纪四角石总科和锁角角石总科（菊石总科）下颌外钙质层的显微结构和矿物学

• DOI: 10.1111/j.1502-3931.2011.00272.x
• 发表时间: 2012
• 期刊: Lethaia
• 影响因子: 1.5
• 作者: Tanabe;K.;Landman;N.H. and Kruta;I.
• 通讯作者: I.

Origins of cephalopod body plans: A geometrical and developm ental basis for the evolution of vertebrate-like organ systems.

头足类身体结构的起源：类脊椎动物器官系统进化的几何和发育基础。

• 发表时间: 2009
• 期刊: Cephalopods Present and Past (印刷中)
• 作者: Shigeno;S.;Sasaki;T. & Boletzky;S. v.
• 通讯作者: S. v.

Reconstructing the life history of modern and fossil nautiloids based on the nitrogen isotopic composition of shell organic matter and amino acids.

基于壳有机质和氨基酸的氮同位素组成重建现代和化石鹦鹉螺的生命史。

• 发表时间: 2010
• 期刊: Cephalopods-Present and Past.Proceedings of the 7th International Symposium.(Tanabe K., Y.Shigeta, T.Sasaki eds.)(Tokai Univ.Press)
• 作者: Kashiyama Y.;N.O.Ogawa;Y.Chikaraishi;N.Kashiyama;S.Sakai;K.Tanabe;N.Ohkouchi
• 通讯作者: N.Ohkouchi

Anatomy of living Nautilus: Reevaluation of primitiveness and comparison with Coleoidea.

现存鹦鹉螺的解剖：原始性的重新评估以及与鞘翅目的比较。

• 发表时间: 2009
• 期刊: Cephalopods Present and Past (印刷中)
• 作者: Sasaki;T.;Shigeno;S. & Tanabe;K.
• 通讯作者: K.