Gonyaulax tamarensis var. excavata Braarud
(Please note: only references with the binomials in the title are included. The information is from the Literature database.)
Anderson, D.M. & Wall, D. (1978). Potential importance of benthic cysts of Gonyaulax tamarensis and G. excavata in initiating toxic dinoflagellate blooms. Journal of Phycology 14: 224-234.