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Leptocardii

plural noun
Lep·​to·​car·​dii | \ -dēˌī\

Definition of Leptocardii

in some classifications
: a class coextensive with Cephalochordata and often considered the lowest division of Vertebrata

History and Etymology for Leptocardii

New Latin, from lept- + -cardii (from Greek kardia heart)

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