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Taxonomy
Nucula hannibali was named by Clark (1925). Its type specimen is LSJU 2, a shell, and it is a 3D body fossil. Its type locality is SUNP #90 - Gettysburg (Blakeley Formation), which is in a Chattian coastal sandstone in the Blakeley Formation of Washington.
Sister species lacking formal opinion data
N. angusta, N. calliope, N. cipleyensis, N. ciplyensis, N. cochlear, N. dasa, N. defuniak, N. dixoni, N. fritschi, N. guillermensis, N. indica, N. meadinga, N. microconcentrica, N. otamatea, N. pectinata, N. potomacensis, N. praelongata, N. pulchra, N. rivulana, N. sagittata, N. stachei, N. subtrigona, N. silicea, N. mametschinskensis, N. planata, N. aptera, N. waiaotea, N. waiotea, N. eudorae, Nuculana smithvillensis