Trilobita - Proetida - Hystricuridae
Full reference: R. J., J.r. Ross. 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
See also Adrain et al. 2003, Jell and Adrain 2002 and Sepkoski 2002
Sister taxa: Hyperbolochilus, Metabowmania, Pachycranium, Tanybregma
Subtaxa: Hillyardina levis Hillyardina marginauctum Hillyardina minuspustulata Hillyardina semicylindrica Hillyardina tasmaniensis
Type: Hillyardina semicylindrica
Ecology: fast-moving low-level epifaunal deposit feeder
Distribution:
• Arenig of Argentina (1 collection)
• Ordovician of Australia (2), Canada (21: Newfoundland, Newfoundland and Labrador), United States (11: Idaho, Nevada, Utah)
• Tremadoc of Canada (3: Alberta)
• Skullrockian of Canada (1: Newfoundland)
Total: 39 collections including 41 occurrences
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.