Onychophora

included taxa - Tree of Life

species classification - University of Michigan Museum of Zoology

classification, included taxa and references - Palaeos web site

ITIS - taxonomy and nomenclatural information - Integrated Taxonomic Information System

taxonomic hierarchy - The Taxonomicon

IRMNG genera list

genome size - Animal Genome Size Database

genome size - Animal Genome Size Database

overview, lab exercise, part of online Invertebrate Anatomy course

online fact sheet from Australian Museum Online - includes images