Trilobita - Proetida - Hystricuridae

Full reference: R. J. Ross, Jr. 1951. Stratigraphy of the Garden City Formation in northeastern Utah, and its trilobite faunas. Yale Peabody Museum of Natural History Bulletin 6:1-161

Parent taxon: Hillyardininae according to J. M. Adrain and S. R. Westrop 2007

Sister taxa: Hyperbolochilus, Metabowmania, Pachycranium, Tanybregma

Subtaxa: Hillyardina levis, Hillyardina marginauctum, Hillyardina minuspustulata, Hillyardina semicylindrica, Hillyardina tasmaniensis

View classification

Type: Hillyardina semicylindrica

Ecology: fast-moving low-level epifaunal deposit feeder