{"title":"Structure of the Shell Wall in Raskiniella plana (Subclass Spirillinana).","authors":"V I Mikhalevich","doi":"10.1134/S0012496625700012","DOIUrl":null,"url":null,"abstract":"<p><p>The shell wall ultrastructure is known for three of the four classes of multicameral Foraminifera with a secretive calcareous shell wall: Rotaliata Mikhalevich, 1980; Miliolata Saidova, 1981; and Nodosariata Mikhalevich, 1992. It was believed that one or few large crystals form the wall in Spirillinata Mikhalevich, 1992. The study showed that the entire shell is formed of amorphous, rather than crystalline, CaCO<sub>3</sub> in Raskiniella plana (previously classified as Spirillina plana Wiesner, 1931), which is a typical representative of this class. Amorphous calcareous skeletons are known in certain unicellular algae and multicellular eukaryotes, a skeleton of the entire adult shell completely build of amorphous CaCO<sub>3</sub> was observed for the first time in Foraminifera.</p>","PeriodicalId":11351,"journal":{"name":"Doklady Biological Sciences","volume":"521 1","pages":"134-137"},"PeriodicalIF":0.0000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Doklady Biological Sciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/S0012496625700012","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/11 0:00:00","PubModel":"Epub","JCR":"Q3","JCRName":"Agricultural and Biological Sciences","Score":null,"Total":0}
引用次数: 0
Abstract
The shell wall ultrastructure is known for three of the four classes of multicameral Foraminifera with a secretive calcareous shell wall: Rotaliata Mikhalevich, 1980; Miliolata Saidova, 1981; and Nodosariata Mikhalevich, 1992. It was believed that one or few large crystals form the wall in Spirillinata Mikhalevich, 1992. The study showed that the entire shell is formed of amorphous, rather than crystalline, CaCO3 in Raskiniella plana (previously classified as Spirillina plana Wiesner, 1931), which is a typical representative of this class. Amorphous calcareous skeletons are known in certain unicellular algae and multicellular eukaryotes, a skeleton of the entire adult shell completely build of amorphous CaCO3 was observed for the first time in Foraminifera.
期刊介绍：
Doklady Biological Sciences is a journal that publishes new research in biological sciences of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia in the form of short articles. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.
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