Subphylum Crustacea: Aquatic Mandibulates. Diversity Over 67,000 species worldwide Live in aquatic environments (both ocean and freshwater) Can burrow,
Phylogeny of Arthropods Arthropoda Worm-like Ancestor Trilobites (extinct) Annelids (worms) Onychophorans (worms w/legs) Chelicerates (spiders) Crustaceans.
Aquatic Mandibulates
Arthropods
