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Triarthrus

noun
Tri·​ar·​thrus | \ trīˈärthrəs\

Definition of Triarthrus

: a genus of small Ordovician trilobites of which one form (T. eatoni) is often found with antennae and appendages in a good state of preservation

History and Etymology for Triarthrus

New Latin, from tri- + Greek arthron joint

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