This is an excellent way to increase your knowledge in marine biology. Do you know what is the family of the specie you discover underwater and what is its level of evolution ?
The main goal of this part is to increase your knowledge in marine species you've seen underwater, and to let you discover new ones you've not yet seen. For each species, a data sheet is available with my pictures. This data sheet detail the species classification and give you informations about identification, way of life, reproduction, nutrition, etc.
Use the tree of life to discover species ! For example, climbing up to the tree, you can click on the "Mollusc" phylum and consult all the pictures of Mollusc as cephalopods (octopus, sepia...) and nudibranchs (sea slug).
If you want to know more about a species, consult the different marine biology websites. You can find some on the link page, marine biology rubric.