antecosta
noun
an·te·cos·ta
| \ ˈantə̇ˌ-, -tē-\
plural antecostae
or antecostas
Definition of antecosta
: the internal ridge that is externally manifested as a groove, that appears near the anterior margin of the typical dorsal or ventral plate of the primitive segment of an arthropod, and that provides attachment for the longitudinal muscles
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