Synonyms for paleozoic
ˌpeɪ li əˈzoʊ ɪk; esp. Brit. ˌpæl i-pa·le·o·zoic

Princeton's WordNet

1. Paleozoic, Paleozoic eraadjective

   from 544 million to about 230 million years ago

2. Paleozoicadjective

   of or relating to or denoting the Paleozoic era

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1. Conrad Labandeira:

   That, in turn, suggests that the two groups of insects share a genetic program for eyespot production, the last common ancestor of these insects lived about 320 million years ago, deep in the Paleozoic. So we think this must be a developmental mechanism that goes all the way back to the origins of winged insects.