Cambrian Microfossils of the Genus Corollasphaeridium: New Interpretation and Revision of Systematics

IF 0.7 4区 地球科学 Q4 PALEONTOLOGY
O. V. Dantes, K. E. Nagovitsin, E. G. Raevskaya
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Abstract

Bell-shaped microfossils found in Lower Cambrian Tommotian of the Siberian Platform were compared with morphologically similar forms of the Lower Cambrian of Australia, assigned to the acritarch genus Corollasphaeridium (Martin in Dean et Martin, 1982) Martin, 1992 (Gravestock et al., 2001). Revision of the genus using geometric-morphometric method allowed us to justify the separation of Siberian and Australian forms into a separate genus Spicaticampaniformis gen. nov. with two species in its composition. A description of the new genus is given and supplemented descriptions of species of S. aliquolumus and S. opimolumus. According to the revealed characteristics of their structure, excluding the form of a whole closed body, inherent to acritarchs, and taking into account the variability of features comparable with model organisms (priapulids, acanthocephalans, chitinozoa), the assignment of the genera Corollasphaeridium and Spicaticaticampaniformis to the Metazoa group is proposed. General regularities in the variation of species of Spicaticampaniformis opimolumus and Acanthocephala, which may indicate similar ecomorphotypes, as well as Corollasphaeridium wilcoxianum and Priapulida, which may also be ecomorphotypes, are described.

Abstract Image

寒武纪 Corollasphaeridium 属的微化石:系统学的新解释和修订
摘要 将在西伯利亚地台下寒武统中发现的钟状微化石与澳大利亚下寒武统中形态相似的钟状微化石进行了比较,后者被归入棘皮动物属 Corollasphaeridium(Martin,见 Dean et Martin,1982 年)Martin,1992 年(Gravestock 等人,2001 年)。利用几何形态计量法对该属进行了修订,使我们有理由将西伯利亚型和澳大利亚型分离为一个独立的 Spicaticampaniformis gen.aliquolumus 和 S. opimolumus 的描述。根据所揭示的其结构特征(不包括刺毛虫固有的整体闭合体形式),并考虑到与模式生物(棘皮动物、棘头动物、壳类动物)相当的特征变异性,建议将 Corollasphaeridium 属和 Spicaticampaniformis 属归入 Metazoa 群。描述了 Spicaticampaniformis opimolumus 和 Acanthocephala 物种变异的一般规律性,这可能表明它们具有相似的非形态型,以及 Corollasphaeridium wilcoxianum 和 Priapulida,它们也可能具有非形态型。
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来源期刊
Paleontological Journal
Paleontological Journal 地学-古生物学
CiteScore
1.20
自引率
33.30%
发文量
70
审稿时长
6-12 weeks
期刊介绍: Paleontological Journal (Paleontologicheskii zhurnal) is the principal Russian periodical in paleontology. The journal publishes original work on the anatomy, morphology, and taxonomy of fossil organisms, as well as their distribution, ecology, and origin. It also publishes studies on the evolution of organisms, ecosystems, and the biosphere and provides invaluable information on global biostratigraphy with an emphasis on Eastern Europe and Asia.
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