We too have gill slits in the embryonic stage. This amazing life form is explained simply and clearly. Bryozoans lace corals are beautiful living fossils. Annelids, Flat worms, Spoon worms. Undersea flowers of deadly beauty.
Sea spiders have hollow legs into whivh their stomachs go and the male carries the eggs.
Sea stars, Feather stars, Sea urchins. Weird synthesis of mechano and living flesh. A bizarre Phylum of animals that defy credibility when you look closely at their anatomy. These plants are neglected but they are worth a close look because they are the beginning of life in the sea. Hydroids, Jellies, Anemones, Zooanthids, Corals.