Diatoms live in cool water and are parts of large colonies. They are the largest phytoplankton and can produce up to 100000 times a month.
Meroplankton are plankton for their larval stage and part of the reef the rest of their lives. Meroplankton includes sea urchins, starfish, sea squirts, most of the sea snails and slugs, crabs, lobsters, octopus, marine worms and most reef fishes.
Aquatic Macrophyte- Bryophytes
Bryophytes are small green plants including Hornworts, Liverworts, and mosses. They reproduce by spore production and are usually only one cell deep.
Lionfish are marine fish that live in rocky crevices. Lionfish are venomous and use this as a defense mechanism. It has very fast reflexes and is camouflaged for the most part.
Crayfish are freshwater crustaceans found in ponds and streams. They are scavengers.
Mammal- Duckbill Platypus
The Duckbill Platypus is a land dweller, but spends much of its time in the water. It can open its eyes, ears, and nostrils underwater. It is an egg-laying mammal.