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Volume 42, Issue 5, 2025
Articles
New species of the deep-water bivalve genera Acesta (Limidae, Bivalvia, Mollusca) and a questionable Malletia (Malletiidae, Bivalvia, Mollusca) from the Eocene of southern California
Fossils of two rarely encountered molluscan bivalve genera, Acesta (Limidae, Bivalvia, Mollusca) and questionably Malletia (Malletiidae, Bivalvia, Mollusca) were collected from in the early Eocene Ardath Shale, La Jolla Group from La Jolla, San Diego County, California. These specimens represent new species easily distinguished from other members of the genera from the northeastern Pacific Cenozoic and Holocene. The new Acesta is similar in size and outline to the modern Philippine species A. rathbuni (Bartsch 1913), while the new Malletia is most similar to the Holocene northeastern Pacific species M. faba Dall (1897).