Article Link:
Fish invading dinoflagellates: a synopsis of existing and newly proposed genera.
Authors:
J. Lom
Journal:
Folia parasitol 28 (1981): 3-11.
Just quoting this nice description of Amyloodinium’s basic features.
Notably, they have no chloroplasts, they do have thecal plates (armor).
And at the time they were only known to be a problem for stressed out captive fish.
Reef Success 
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