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The taxonomy, biostratigraphy, and phylogeny of Oligocene Catapsydrax, Globorotaloides, and Protentelloides is reviewed. Catapsydrax and Globorotaloides are long-ranging genera with robust and dissolution-resistant tests. Both genera appeared in the early Eocene. Catapsydrax disappeared in the late Miocene while Globorotaloides has living representatives. Catapsydrax is ubiquitous in its distribution and highly variable in test size. Oligocene species of Globorotaloides are typically small (<250 μm) and usually rare in the tropics but may be common in high latitude and upwelling regions. After little evolutionary change in the Eocene and early Oligocene, Globorotaloides and Catapsydrax diversified at low latitudes in the mid-...

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