Rudoloculina hooperi, a new miliolid from Holocene and modern shelf sediments of the northeastern Pacific Ocean, is characterized by chambers that are quadrate in cross-section and by a test wall with embedded agglutinated grains, some of which consist of miliolid-type shell material (subparallel calcite laths). The agglutinated grains are either calcareous and low in magnesium (Mg/Ca ≤ 0.01) or silicic. Rudoloculina hooperi has previously been mistakenly reported from the same region as Quinqueloculina agglutinata Cushman. The morphologically similar genus Cycloforina has been reported mostly from warmer waters, suggesting that R. hooperi is near the northern limit of its range in the Gulf of Alaska.

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