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词条 Pseudoschwagerina
释义
Pseudoschwagerina
fossil protozoan genus
extinct genus of fusulinid foraminiferans (single-celled animals with hard shells preservable as fossils) found as fossils in Early Permian marine rocks (286 to 258 million years ago). The shell is spherical with localized thickening as a sort of lip. In thin section, the shell structure consists of widely spaced inner walls and distinctive wall deposits. Pseudoschwagerina is a guide, or index, fossil for the Wolfcampian Stage, a division of Permian rocks.
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更新时间:2025/4/6 3:57:49