The ‘Middle’ Cretaceous of the Northern California Coast Ranges has yielded unusually well-preserved specimens of Litosphaeridium, some of which (Litosphaeridium arundum, Litosphaeridium bacar, Litosphaeridium conispinum, and Litosphaeridium siphoniphorum subsp. glabrum) have been analyzed in detail previously. Two other species, which were discovered later, are Litosphaeridium adnatum sp. nov. and Litosphaeridium gaponoffiae sp. nov. Litospheridium adnatum sp. nov. is most similar to Litosphaeridium siphoniphorum, but has an adnate operculum, sulcal processes, a more elongate central body, and less of the central body is covered by processes. The other, Litosphaeridium gaponoffiae sp. nov., is most similar to Litosphaeridium arundum and Litospheridium fucosum, but has goblet-shaped processes, a free operculum, a more spherical central body, and its cingular processes are not reduced as they are in Litospheridium arundum. The two species are from the late Albian based on the associated dinoflagellate cysts.

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