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Analysis of the wall structures of Eocene normal perforate planktonic foraminifera permits the separation of groups of taxa that have significance for phylogeny and classification. The following spinose wall textures are recognized: sacculifer-type, ruber-type, sacculifer/ruber-type, Turborotalita-type, bulloides-type, and Clavigerinella-type. The Clavigerinella-type is subdivided into a Hantkenina-subtype in which spines have apparently been lost, except perhaps in some juvenile stages. Nonspinose wall texture includes smooth-walled, muricate, Globoquadrina-type, Turborotalia-type, and microperforate. The Globoquadrina-type is believed to have originated from the muricate genus Acarinina in the development of Dentoglobigerina, and the Turborotalia-type originated from the smooth-walled genus Globanomalina in the development of the genus Turborotalia. Diagenetic alterations of primary wall texture include dissolution, degradation of layered wall structure, and recrystallization. This has implications for the recognition/interpretation of wall texture.

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