01626nas a2200145   4500008004100000245012400041210006900165300001200234490000700246520109400253653001701347100002001364700001601384856008001400       2011                        eng d00aLower Cambrian (Branchian) Eodiscoid Trilobites from the Lower Brigus Formation, Avalon Peninsula, Newfoundland, Canada0 aLower Cambrian Branchian Eodiscoid Trilobites from the Lower Bri  a209-2620 v423 a<p>Eodiscoids form a significant component of the Lower Cambrian (Branchian) trilobite fauna of the St. Mary's and lower Jigging Cove members of the Brigus Formation exposed along Conception and Trinity bays, northern Avalon Peninsula, Newfoundland. Two species of Serrodiscus Richter and Richter, four species of Hebediscus Whitehouse, and rare sclerites of Meniscuchus? pik and Calodiscus Howell are documented; type material of M.? helena (Walcott) is reillustrated. Hebediscus attleborensis (Shaler and Foerste) is restricted to the types, and H. williamsi is new. A parsimony analysis indicates that Serrodiscus is paraphyletic but supports monophyly of Acidiscus Rasetti, Bolboparia Rasetti and Stigmadiscus Rasetti. Above a sparsely fossiliferous interval in the lowest part of the Brigus, three eodiscoid faunas can be identified in the upper St. Mary's and lower Jigging Cove members, in ascending order, the Hebediscus planus, H. williamsi and Calodiscus cf. C. lobatus faunas. The lower two faunas correspond to part of the traditional "Callavia Zone" of previous workers.</p>
10apaleontology1 aWestrop, S., R.1 aLanding, E.  uhttp://search.informit.com.au/documentSummary;dn=984617395155287;res=IELHSS