plural noun
Sed·​en·​tar·​ia | \ˌsedᵊn‧ˈta(a)rēə\

Definition of Sedentaria 

in some classifications

: a division of Polychaeta comprising sedentary usually tube-dwelling worms with reduced parapodia and sense organs and typically with highly developed filamentous anterior respiratory organs or gills — compare errantia , sabellaria

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History and Etymology for Sedentaria

New Latin, from Latin, neuter plural of sedentarius sedentary

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the figure or shape of a crescent moon

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