myriapod: general term for any terrestrial arthropod having an elongated body composed of many similar segments: e.g. centipedes and millipedes
arthropod: invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
chronoperates paradoxus: shrew-sized protomammal from the Alberta region of Canada; from about 55 million years ago (much more recent than other mammal-like reptiles)