any animal lacking a backbone or notochord; the term is not used as a scientific classification

jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedes

hard plate or element of the exoskeleton of some arthropods

hard outer covering or case of certain organisms such as arthropods and turtles

ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles

any of the segments in the body of a jointed animal like an arthropod

the middle region of the body of an arthropod between the head and the abdomen

of or relating to invertebrates of the phylum Arthropoda

an extinct arthropod that was abundant in Paleozoic times; had an exoskeleton divided into three parts

air-breathing arthropods characterized by simple eyes and four pairs of legs

general term for any terrestrial arthropod having an elongated body composed of many similar segments: e.g. centipedes and millipedes

minute arthropod often infesting the underground parts of truck-garden and greenhouse crops

an arthropod of the division Tardigrada

jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedes

hard plate or element of the exoskeleton of some arthropods

hard outer covering or case of certain organisms such as arthropods and turtles

ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles

any of the segments in the body of a jointed animal like an arthropod

the middle region of the body of an arthropod between the head and the abdomen