▪ 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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Universalium. 2010.

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  • Asselian Stage — ▪ geology       first of the four stages of the Lower Permian (Cisuralian) Series, encompassing all rocks deposited during the Asselian Age (299 million to 294.6 million years ago) of the Permian Period. The Asselian Stage is especially well… …   Universalium

  • ψευδοσβαγερίνα — η, Ν (παλαιοντ.) απολιθωμένο γένος τρηματοφόρων. [ΕΤΥΜΟΛ. Νόθο αντιδάνειο σύνθ., πρβλ. νεολατ. pseudoschwagerina < pseudo (< ψευδ[ο] *) + schwagerina «σβαγερίνα»] …   Dictionary of Greek

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