anaprotaspis

noun
ana·​pro·​tas·​pis | \ˌanəprōˈtaspə̇s\
plural anaprotaspes\ -​taˌspēz \

Definition of anaprotaspis 

: an early protaspis with but six segments all of which are incorporated in the cephalon of the adult trilobite

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First Known Use of anaprotaspis

1895, in the meaning defined above

History and Etymology for anaprotaspis

New Latin, from ana- + protaspis

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The first known use of anaprotaspis was in 1895

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