Classification of the genus Billingsella
G. †Billingsella Hall and Clarke 1892
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†Billingsella aliena Nikitin 1956
†Billingsella anomala Walcott 1905
†Billingsella appalachia Walcott 1905
†Billingsella bivia Walcott 1912
†Billingsella coloradoensis Shumard 1860
†Billingsella corrugata Ulrich and Cooper 1936
†Billingsella costata Zhan et al. 2010
†Billingsella dice Walcott 1905
†Billingsella exporrecta Linnarsson 1876
†Billingsella exporrecta rugosicostata Walcott 1905
†Billingsella harlanensis Walcott 1905
†Billingsella hicksi Davidson 1868
†Billingsella holtedahli Walcott 1924
†Billingsella lindstromi Linarsson 1876
†Billingsella major Walcott 1905
†Billingsella marion Walcott 1908
†Billingsella obscura Walcott 1905
†Billingsella orientalis Whitfield 1884
†Billingsella perfecta Ulrich and Cooper 1936
†Billingsella plicatella Walcott 1905
†Billingsella pumpellyi Walcott 1905
†Billingsella rectangulata Cooper 1952
†Billingsella richthofeni Walcott 1905
†Billingsella saffordi Walcott 1905
†Billingsella salemensis Walcott 1887
†Billingsella seletensis Nikitin 1956
†Billingsella striata Walcott 1905
†Billingsella tonkiniana Mansuy 1915
†Billingsella uniplicata Popov et al. 2011
†Billingsella whitfieldi Walcott 1884