nonmetameric

/nɑnˌmɛtəˈmɛrɪk/
adjective
  1. Not divided into repeated segments or body sections; not having a segmented body plan.
    • Flatworms are nonmetameric, unlike earthworms which have clear segments.
    • The nonmetameric body of a jellyfish is simple and unsegmented.
    • In biology class, we compared metameric annelids with nonmetameric mollusks.
Antonyms
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