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Twelve acritarchs (organic‐walled microphytoplankton incertae sedis) including Comasphaeridium caesarialum n. sp. and Medou‐sapalla choanoklosma n. gen. et sp., are described and illustrated. This is the first assemblage to be reported from the Lower Cambrian of the United States. These acritarchs were recovered from the Murray Shale (Chilhowee Group), of Tennessee, a well‐dated stratigraphic unit which also yields the oldest known skeletal fossils from the eastern United States.
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