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ABSTRACT

The taxonomy, phylogeny, and biostratigraphy of Eocene Globanomalina, Planoglobanomalina Olsson and Hemleben n. gen. and Pseudohastigerina is reviewed. Planoglobanomalina n. gen. is an asymmetrical planispiral taxon that originates from trochospiral Globanomalina planoconica in Zone E6 in an evolutionary transition that parallels the independent origin of Pseudohastigerina from Globanomalina luxorensis. A total of ten species are recognized as distinct, namely Globanomalina australiformis (Jenkins), Globanomalina chapmani (Parr), Globanomalina luxorensis (Nakkady), Globanomalina ovalis Haque, Globanomalina planoconica (Subbotina), Planoglobanomalina pseudoalgeriana Olsson and Hemleben n. sp., Pseudohastigerina micra (Cole), Pseudohastigerina naguewichiensis (Myatliuk), Pseudohastigerina sharkriverensis Berggren and Olsson, and Pseudohastigerina wilcoxensis (Cushman and Ponton). Ontogenetic and wall texture study indicates that G. australiformis gave rise by the heterochronic process of hypermorphosis to the Eocene genus Turborotalia.

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