Maximum likelihood (ML) tree (-ln L = 10139.70214) inferred from 32 SSU rDNA sequences, 1,571 unambiguously aligned sites and a GTR+I+G+8 model of nucleotide substitutions. Numbers above the branches denote PhyML bootstrap percentages, and numbers below the branches denote Bayesian posterior probabilities. Black circles denote PhyML bootstrap percentages and posterior probabilities of 100% and 1.00, respectively. Line drawings were modified from the following sources: Massisteria marina , Pseudodifflugia gracilis , Cryothecomonas sp. , Ebria tripartita , Cercomonas sp. , Euglypha alveolata , Heteromita globosa , Thaumatomonas lauterborni , and Pseudopirsonia sp. . The asterisk next to sequence [GenBank:DQ388459] was derived from an environmental sequencing survey and was listed in GenBank as the dinoflagellate Exuviaella pusilla by Lin et al. .