the following 2 images were taken from: http://130.158.208.53/www/taxonomy/Phytomastigophora/Dinophyta/index.html
Reproduction: mostly asexual though some sexual. Division unusual in that chromosomes remain condensed with no histones and a persistent nuclear envelope. 40X DNA amount found in a human cell!
Some species are luminescent when agitated - tropical seas.
Some are symbionts with sponges, jellyfish and corals.
