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Taxonomy
Acila brevis was named by Nagao and Huzioka (1941) [DISTRIBUTION: Late Eocene; Japan.]. It is not a trace fossil.
It was recombined as Acila (Acila) brevis by Kafanov and Ogasawara (2003), Kafanov et al. (2005).
It was recombined as Acila (Acila) brevis by Kafanov and Ogasawara (2003), Kafanov et al. (2005).
Sister species lacking formal opinion data