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Informationen zum Autor Professor Richard Fortey , F.R.S. is Merit Researcher at the Department of Palaeontology, Natural History Museum. Klappentext This monograph describes early Ordovician (Ibexian: Tremadocian-early Floian) trilobites from Northern Spitsbergen from the section through the Kirtonryggen Formation adjacent to Hinlopen Strait. The Formation is divided into three Members, each with distinct trilobites collectively representing the fullest known succession from the Bathyurid biofacies of the eastern Laurentian carbonate platform. Previous research on the Ordovician of Spitsbergen is summarised and correlations with similar faunas previously described from Canada, Greenland, western Newfoundland, Vermont-New York State, Oklahoma and Missouri are discussed. Taxonomic problems are discussed in detail leading to the recognition of 53 species, of which 15 are new, belonging to 31 genera including four new. Twenty-four taxa are described under open or tentative nomenclature. The lower Member yields the earliest known occurrences of the Illaenoidea, Proetoidea and Scutelluoidea, supporting the hypotheses relating the origin of new major clades to inshore habitats. Zusammenfassung This monograph describes early Ordovician (Ibexian:Tremadocian early Floian) trilobites from Northern Spitsbergen from the section through the Kirtonryggen Formation adjacent to Hinlopen Strait. Inhaltsverzeichnis Introduction 2 Summary of previous research on the Ordovician of Spitsbergen 3 Stratigraphy of the Kirtonryggen Formation 4 Stratigraphic sub-divisions and age 4 Tremadocian-Floian boundary 9 Correlation with other areas of Ordovician Laurentia 10 Greenland 11 Canada 12 Northwest Scotland 13 USA 13 Occurrence of trilobites in the Kirtonryggen Formation 15 Field occurrence 15 Biofacies and biogeography 15 Peculiarities of the Spitsbergen faunas 16 Eastern and western Laurentia 17 Origin of major trilobite clades 18 Th e family Bathyuridae 19 Th e problem of type species 20 Morphology of Bathyuridae 21 Systematic Palaeontology 23 Order Aulacopleurida Adrain, 2011 23 Family Hystricuridae Hupé, 1953 23 Genus Svalbardicurus ngen 23 Svalbardicurus delicatus nsp 24 Genus Hystricurus Raymond, 1913 26 Hystricurus cfHystricurus spnovB Adrain et al., 2003 26 Hystricurus sp1 27 Order Proetida Fortey & Owens, 1975 28 Family Bathyuridae Walcott, 1886 28 Sub-family Bathyurinae Walcott, 1886 28 Genus Bolbocephalus Whitfi eld, 1890 28 Bolbocephalus gunnari nsp 30 Bolbocephalus convexus (Billings, 1865) 31 Bolbocephalus stclairi Cullison, 1944 33 Bolbocephalus spcfBkindlei Boyce, 1989 35 Genus Catochia Fortey, 1979 35 Catochia hinlopensis nsp 35 Catochia ornata Fortey, 1979 37 Genus Jeffersonia Poulsen, 1927 37 Jeffersonia striagena nsp 38 Jeffersonia viator nsp 42 Jeffersonia timon (Billings, 1865) 44 'Jeffersonia' aff Jgranosa Cullison, 1944 46 Genus Peltabellia Whittington, 1953 46 Peltabellia glabra nsp 47 Genus Petigurus Raymond, 1913 49 Petigurus nero (Billings, 1865) 49 Petigurus groenlandicus Poulsen, 1937 50 Genus Psalikilopsis Ross, 1953 52 Psalikilopsis nspaff Pcuspicaudata Ross, 1953 53 Bathyurine ngennspA 54 Sub-family Bathyurellinae Hupé, 1953 55 Genus Bathyurellus Billings, 1865 55 Bathyurellus abruptus Billings, 1865 56 Bathyurellus diclementsae nsp 57 Genus Benthamaspis Poulsen, 1946 60 Benthamaspis gibberula (Billings, 1865) 60 Benthamaspis conica Fortey, 1979 62 Genus Ceratopeltis Poulsen, 1937 63 Ceratopeltis cfCbatchensis Adrain & Westrop, 2005 63 Genus Chapman...
