Article: Upper Ordovician trilobites from central New South Wales

Twelve trilobite species are described and illustrated from Upper Ordovician (Caradoc) successions of central New South Wales. Included among the forms is a new scutelluid genus, Heptabronteus, with two new species. H. atavus (type species) and H. major, and five other new species. Toernquistia arguta, Parkesolithus dictyotos, Sphaerocoryphe exserta, Amphilichas nasutus, and A. encyrtos. A discussion of relationships between Heptabronteus and other scutelluid genera is presented. Triathrus is recorded for the first time from New South Wales, and evidence for dimorphism in the raphiophorid. Malongullia oepiki Webby. Moors, and McLcan, 1970, considered. The stratigraphical distribution of the faunas is described, and zoogeographical relationships discussed. The New South Wales fauna is included in the Heptabronteus-Pliomerina province of Australia, South-East Asia, and Kazakhstan, one of two or more separate provinces within the much larger, band-like, probably equatorial. Remopleurid realm of the Caradoc. The faunas are interpreted broadly as occurring in an island-are tectono-environmental setting. They have been differentiated into a possible benthonic assemblage in the shallow-water carbonate rise facies, and into inferred benthonic and pelagic associations in the deeper, graptolitic shale slope and trough facies.