|Series||Stockholm contributions in Geology -- 40(1), 1985|
|The Physical Object|
|Number of Pages||62|
Heterochrony in Silurian phacopid trilobites as suggested by the ontogeny of Acernaspis. LARS RAMSKÖLD. Department of Palaeozoology, Swedish Museum of Natural History, Box S‐ Stockholm; 15th September, Search for more papers by this author. LARS by: The distribution of phacopid trilobites in space and time IVO CHLUPAC _v Chlupac, I. The distribution ofphacopid trilobites in space and time. Fossils and Strata, No. 4, pp. Oslo. ISSN ISBN The richest representation and radiation of phacopid trilobites . Abstract Trilobites of the family Cheiruridae are described from the Silurian of Gotland, Sweden. Nineteen species (fourteen named formally, of which six are new) are assigned to seven genera (one new). The generic composition of the fauna shows affinities with East Baltic, Bohemian, British, and Canadian faunas. The hitherto poorly known dalmanitid trilobite genus Chacomurus Braniša & Vaněk, , with type and only recognised species C. confragosus from the upper Lochovian or Pragian to Emsian of.
Following the end-Ordovician extinction, global clade diversity of Silurian trilobites dropped to about half of Ordovician levels. Although clade diversity failed to recover, this extinction had surprisingly little long-term impact on the number of trilobite species that occupied local habitats (alpha diversity). The Hollardops beds contain a rich and well-preserved trilobite fauna, including the nominal dalmanitid trilobite species Hollardops mesocristata, as well as Phacops saberensis and various rare taxa such as the bizarre dalmanitid Psychopyge, the proetid Gerastos, the odontopleurid Leonaspis, and the scutelluid Scabriscutellum (Fig. 3, Fig. 6). Journal of Paleontology The trilobites Bathvurus and Eomonorachus from the Middle Ordovician of Oklahoma and their biofacies significance. Royal Ontario Museum, Life Sciences Contribution In The Ordovician trilobite Pseudogvgites Kobayashi in eastern and arctic North America, press Royal Ontario Museum. The west Balkhash Region, which embraces the eastern part of the Betpak-Dala desert, is a sparsely populated area in central Kazakhstan, west of Lake Balkhash (Fig. 1(A)).During the late s and early s extensive geological mapping programs were carried out and widespread Devonian deposits identified; however, later access to significant parts of the area was denied due to military.
Trilobites of the family Odontopleuridae are described from the Silurian of Gotland, Sweden. Twelve species and subspecies (nine named, of which four are new) are assigned to four genera. Anacaenaspis gotlandensis Bruton, is considered to be a junior subjective synonym of Acidaspis pectinata Angelin, , which is therefore the type. The phacopid trilobites form a widely diverse group which first appeared in North America during the early Chazyan (Lenoir limestone). From then until the close of the Hamilton, they form an element in almost all faunas, and an occasional straggler extends their range into the Chemung. Budil, P. (): Dalmanitid and acastid trilobites of the Ordovician and Silurian of the Prague Basin. - MS Diploma Thessis, Czech Geological Survey, pp. Prague. Budil, P. (): Complete, early holaspid specimen of Metascutellum pustulatum (Trilobita) from the Dvorce-Prokop Limestone (Lower Devonian). - Acta Univ. Carol. Geol. 47 ( Stanford Libraries' official online search tool for books, media, journals, databases, Royal Ontario Museum 3; Serviços Geológicos de Portugal 3; University of Michigan. Silurian phacopid and dalmanitid trilobites from Gotland  Ramsköld, Lars. Ekenäs, Finland: Ekenäs Tryckeri Aktiebolag,