A rare coleoid mollusc from the Upper Jurassic of Central Russia
A rare coleoid mollusc from the Upper Jurassic of Central Russia
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俄罗斯中部上侏罗统的一种罕见的鞘状软体动物
DOI：
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发表时间：
2000
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通讯作者：
L. Doguzhaeva
中科院分区：
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作者：
L. Doguzhaeva
Doguzhaeva，洛杉矶，2000。俄罗斯中部上侏罗统罕见的胶体软体动物。——古生物学报，45,4,389-406。来自俄罗斯中部kirnmeridian下部的coleoid头足类软体动物Kostromateuthis roemeri genet sp. n.的壳由缓慢扩张的正圆锥片壳和文石鞘组成，表面凹凸不平，有发育不全的后肺泡部分和长而结实的可能是背侧的沟。鞘缺乏门状茎常见的同心圆结构。它是由针状晶体组成的球晶形成的，具有孔隙度强、原生有机质含量高的特点。每个球晶都有一个多孔的中心部分，一个固体的外围和一个有机的覆盖层。鞘中存在管状结构，其壁由针状晶体形成。为了比较新近螺旋藻和Sepia以及始新世Belemnosis的壳超微结构，用扫描电镜对其进行了研究。根据大体形态和鞘层超微结构初步将其归入螺旋藻，并为其建立了单型科Kostromateuthidae . 11。讨论了中生代螺旋体的演化。
Doguzhaeva, L.A. 2000. Arare coleoid mollusc from the Upper Jurassic of Central Russia. - Acta Palaeontologica Polonica 45,4,389-406. , The shell of the coleoid cephalopod mollusc Kostromateuthis roemeri gen. et sp. n. from the lower Kirnmeridgian of Central Russia consists of the slowly expanding orthoconic phragmocone and aragonitic sheath with a rugged surface, a weakly developed postalveolar part and a long, strong, probably dorsal groove. The sheath lacks concentric structure common for belemnoid rostra. It is formedby spherulites consisting of the needle-like crystallites, and is characterized by strong porosity and high content of originally organic matter. Each spherulite has a porous central part, a solid periphery and an organic cover. Tubular structures with a wall formed by the needlelike crystallites are present in the sheath. For comparison the shell ultrastructure in Recent Spirula and Sepia, as well as in the Eocene Belemnosis were studied with SEM. Based on gross morphology and sheath ultrastructure K. memeri is tentatively assigned to Spirulida and a monotypic family Kostromateuthidae nov. is erected for it. The Mesozoic evolution of spirulids is discussed.