Nyborg, Torrey, Francisco J. Vega, and Harry F. Filkorn. 2023. “Validation of Costacopluma squiresi Nyborg, Vega & Filkorn (Crustacea: Brachyura: Retroplumidae) from the Pacific Slope, Paleocene of California, USA”. Zootaxa 5315 (5). Auckland, New Zealand:492-94. https://doi.org/10.11646/zootaxa.5315.5.7.