01843nas a2200181 4500008004100000245016400041210006900205300001100274490000700285520114300292653002501435100001901460700001601479700002001495700002601515700001601541856010401557 2003 eng d00aClassification of the Trilobite Subfamilies Hystricurinae and Hintzecurinae subfam. nov., with New Genera from the Lower Ordovician (Ibexian) of Idaho and Utah0 aClassification of the Trilobite Subfamilies Hystricurinae and Hi a55-1050 v413 a

The Hystricuridae, previously regarded by most workers as a paraphyletic group, is considered on the basis of new and revised silicified species from Utah and Nevada. Major subgroups of hystricurids appear to be monophyletic, but the sister group relationships of several related families require investigation. The Hystricurinae is restricted to Hystricurus Raymond, 1913, Tersella Petrunina, 1973, and Flectihystricurus gen. nov. (type species: Hystricurus flectimembrus Ross, 1951). A new subfamily Hintzecurinae is diagnosed. The subfamily appears to be restricted to the upper Skullrockian Stage, and comprises the new genera Hintzecurus (t.s.: Hystricurus paragenalatus Ross, 1951), Genalaticurus (t.s.:Hystricurus genalatus Ross, 1951), Ibexicurus (t.s.: I. parsonsi sp. nov.), Lavadamia (t.s.: L.joplinae sp. nov.), Politicurus (t.s.: Hystricurus politus Ross, 1951), and Rossicurus (t.s.:Hystricurus lepidus Hintze, 1953). _ Trilobites, Hystricuridae, Ordovician, Idaho, Utah.

10ageology paleontology1 aAdrain, J., M.1 aLee, D., C.1 aWestrop, S., R.1 aChatterton, B., D. E.1 aLanding, E. uhttps://nysm.nysed.gov/staff-publications/classification-trilobite-subfamilies-hystricurinae-and-hi