Abstract
Remains from vertebrate microfossil localities of the Hell Creek Formation provide a basis for evaluating the diversity and relative abundance of actinopterygians. Taxonomic composition of the basal actinopterygians of the Hell Creek Formation is increased by the recognition of a probable semionotiform designated Holostean A and a small-bodied amiid. A combined taxonomic/parataxonomic approach incorporating data from centra and tooth-bearing elements demonstrates that, at minimum, 17 kinds of teleosts are present in the Hell Creek assemblage. These include an ostariophysan with possible affinities to catfish and the first Cretaceous record of Priscacara.
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