Invertebrate
Apicoplast
Tube Worms
Red Tide
Jellyfish
Worms
Exoskeletons
Outer Shells
Insects
Crustaceans
Protozoa
Protist

https://en.m.wikipedia.org/wiki/Invertebrate_zoology

https://en.m.wikipedia.org/wiki/Riftia_pachyptila

https://en.m.wikipedia.org/wiki/Red_tide

https://en.m.wikipedia.org/wiki/Protist

There are three main types of algae which can form into harmful algal blooms:

cyanobacteria
dinoflagellates
diatoms