plural noun
Ne·​opte·​ryg·​ii | \(ˌ)nēˌäptəˈrijēˌī, ˌnē(ˌ)ōtəˈ-\

Definition of Neopterygii 

in some classifications

: a subclass of Osteichthyes including all the higher bony fishes — compare palaeopterygii

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History and Etymology for Neopterygii

New Latin, from ne- + -pterygii

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the figure or shape of a crescent moon

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