ALT Figure 2 - Assessing dinoflagellate models against the five categories of 20 criteria for a model organism (Dietrich et al., 2020) across the three broad functional groups: family Symbiodiniaceae that consists of predominantly symbiotic taxa, the deep-branching taxa of the parasitic Syndiniales, and the free-living bloom-forming taxa. For each group, each category of accessibility, tractability, resources, research support, and promise are assessed broadly as lacking, developing, or adequate. Images shown for each taxon group are purely examples for each functional group and are not to scale, and they do not reflect their potential as a model organism or species. Images of the two Symbiodiniaceae taxa were provided by Sarah Shah (The University of Queensland, Australia); the image of Amoebophrya ceratii was adapted from John et al. (2019); the three images of free-living dinoflagellates were supplied by Shauna A. Murray (University of Technology Sydney, Australia).