Classification of the genus Sphenacanthus
G. †Sphenacanthus Agassiz 1837
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†Sphenacanthus aequistriatus Davis 1879
†Sphenacanthus costellatus Traquair 1884
†Sphenacanthus hybodioides Agassiz 1843
†Sphenacanthus hybodoides Newberry 1873
†Sphenacanthus marshi Newberry 1873
†Sphenacanthus riorastoensis Pauliv et al. 2012
†Sphenacanthus sanpauloensis Chahud et al. 2010
†Sphenacanthus serrulatus Agassiz 1837