Classification, systematics, and phylogeny
Animal architecture and the bauplan concept
Animal development, life histories, and origins
Phylum Porifera : the sponges
Four phyla of uncertain affinity
Phylum Ctenophora : the comb jellies
Phylum Nemertea : the ribbon worms
Blastocoelomates and other phyla
Phylum Annelida : the segmented worms
The emergence of the arthropods : onychophorans, tardigrades, trilobites, and the arthropod bauplan
Phylum Arthropoda : the Crustacea
Phylum Arthropoda : the Hexapoda (insects and their kin)
Phylum Arthropoda : the myriapods (centipedes, millipedes, and their kin)
Phylum Arthropoda : the Cheliceriformes
Other deuterostomes : Chaetognatha, Hemichordata, Chordata
Perspectives on invertebrate phylogeny.
