Table 2. Ortholog groups detected in the transcriptomes of the three Pseudo-nitzschiaspecies (P. multistriata, P. arenysensis, P. delicatissima) and in those of the model pennate diatom Phaeodactylum tricornutum and the centric Thalassiosira pseudonana.

Group types	Number of homologous groups	% on the total groups
ONEtoONE	3752	27.6%
ONEtoMANY	7301	53.7%
MANYtoMANY	635	4.7%
PARALOGS	1908	14.0%
TOTAL GROUPS	13596