Prorocentrum cf. cassubicum (Dodge and Bibby, 1973)

3.3 Phylogenetic position of Prorocentrum cf. cassubicum

Phylogenetic analysis of the 28S rDNA region, using the Kimura 2-parameter model, grouped the sequence of strain of PNCETMAR-2 into a well-supported clade ( bootstrap = 100) with the sequence strain of PNCETMAR-1 ( Figure 6 View Figure 6 ). These two sequences showed a degree of genetic divergence of 0.02. Both sequences in this study diverged from the five sequences identified as P. cf. norrisianum from the study of Chomérat et al. (2019), with a genetic distance of 0.22 with respect to the sequences in this study, that were also separated from the P. lima sequences with a genetic distance of 0.29. In contrast, employing the Kimura 2-parameter model, the PNCETMAR-2 (PQ182182) strain sequence of the ITS region clustered with those of P. cassubicum ( EU927557 View Materials ) and Prorocentrum sp. ( FJ160593 View Materials ) with a 100 % bootstrap support, and genetic distances of 0.030 and 0.032, respectively

( Figure 7 View Figure 7 ).