He named this smaller species H. gracilis, and it was subsequently involved in the rather confused taxonomy of a specimen which would eventually form the basis of the new genus and species Parahesperornis alexi.
Nazvao je tu vrstu H. gracilis i ona je poslije imala udjela u izrazito zbunjujućoj taksonomiji jednog primjerka koji će na kraju postati osnova novog roda i vrste Parahesperornis alexi.