Relating to or denoting Anarcestes, an extinct genus of early ammonoid cephalopods from the Paleozoic era.
From the genus name Anarcestes (Greek ana- without + archos ruler, or possibly ana- back + arkhe origin) + -an suffix; paleontological terminology.
Anarcestes lived over 330 million years ago and was among the earliest ancestors of octopuses and squid—'anarcestean' literally means relating to creatures that came before modern cephalopod groups evolved.
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