The Animal Kingdom: A Very Short Introduction - Peter Holland 2011
The evolutionary tree of animals
Basal animals: sponges, corals, and jellyfish
The bilaterians: building a body
Lophotrochozoa: wondrous worms
Ecdysozoa: insects and nematodes
Deuterostomes I: starfish, sea squirts, and amphioxus
Deuterostomes II: the rise of vertebrates