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Xiphactinus vetus
Taxonomy
Polygonodon vetus was named by Leidy (1856). It is not extant. It is the type species of Polygonodon.
It was recombined as Xiphactinus vetus by Schwimmer et al. (1997), Shimada et al. (2006), Hoganson et al. (2019).
It was recombined as Xiphactinus vetus by Schwimmer et al. (1997), Shimada et al. (2006), Hoganson et al. (2019).