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870 results for “Ordovician”
Fig. 42 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 42. Variation in angle of expansion in Redpathoceras Flower, 1963, Boda Limestone. R. magnum sp. nov. (grey dots); R. bullatum sp. nov. (black dots); R. depressum sp. nov. (black circles).
Fig. 32 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 32. Median cross sections of Discoceras roemeri Strand, 1934, Boda Limestone, Kallholn. A. PMU 26903. B. PMU 26904. Scale bar = 10 mm for both figures.
Fig. 28 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 28. Color marks in Isorthoceras Flower, 1962, Boda Limestone. Longitudinal striae of varying width occur in several specimen of Isorthoceras; see text for discussion. A. Isorthoceras heroyense (Strand, 1934) comb. nov., PMU 26831, Kallholn. B. Isorthoceras suave (Angelin in Angelin & Lindström, 1880) comb. nov., PMU 26835, Osmundsberget. C. Isorthoceras wahlenbergi Niko, 2008, PMU 26862, Kallholn. Scale bar = 10 mm for all figures.
Fig. 31 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 31. Discoceratids of the Boda Limestone of Kallholn. A. Discoceras roemeri Strand, 1934, PMU 26903. B. Discoceras antiquissimum (Eichwald, 1842), NRM-PZ Mo 8745. Scale bar = 10 mm for both figures.
Fig. 24 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 24. Polished median section (left) and interpretation (right) of Pleurorthoceras osmundsbergense sp. nov., NRM-PZ Mo 190102c, Osmundsberget, Boda Limestone. Dark grey = episeptal and hyposeptal (primary?) deposits; light grey = mural (secondary?) deposits. Scale bar = 10 mm.
Fig. 23 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 23. Orthocerida of the Boda Limestone. A. Pleurorthoceras osmundsbergense sp. nov., NRM-PZ Mo 150126, holotype, Osmundsberget. B. Isorthoceras suave (Angelin in Angelin & Lindström, 1880) comb. nov.,PMU26835, Kallholn.C. Isorthocerasjunceum(Hall,1847),PMU26833, Kallholn.D-E. Isorthoceras cf. elongatocinctum (Portlock, 1843), Kallholn. D. PMU 26814, juvenile growth stage. E. PMU 26825, larger specimen with irregularly spaced transverse ornamentation. F. Isorthoceras curvilineatum sp. nov., PMU 26787, holotype, Osmundsberget. G. Isorthoceras angelini sp. nov., PMU 26774, holotype, Kallholn. H. Geisonoceras? sp., PMU 26758, Kallholn. I. Isorthoceras heroyense (Strand, 1934) comb. nov., PMU 26831, Kallholn. Scale bars: A = 10 mm; B-I = 10 mm.
Fig. 10 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 10. Camera lucida drawings of cross sections of selected Boda Limestone cephalopods. A. Cyrtorizoceras thorslundi sp. nov., PMU 26657, Osmundsberget, mature body chamber. B. Tyrioceras cf. kjaerulfi Strand, 1934, PMU 26897, Kallholn. C. Nathorstoceras adnatum sp. nov., PMU 26733, holotype, Kallholn. D. Nathorstoceras kallholnense sp. nov., PMU 26729, holotype. E. Redpathoceras depressum sp. nov., PMU 26927, holotype, Kallholn, cross section of base of mature truncated conch. F. Schuchertoceras fryi sp. nov., PMU 24744, holotype, Kalllholn, cross section of mature aperture (dark grey) and body chamber (medium grey). G. Redpathoceras bullatum sp. nov., PMU 26923, holotype, Kallholn, cross section of base of mature truncated conch. Prosiphuncular side directed downward in all figures. Siphuncles shown as white circles. Scale bar = 10 mm for all figures.
Fig. 2 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 2. Polished median section of a fragment of a phragmocone of Geisonoceras wegelini (Angelin in Angelin & Lindström, 1880) comb. nov., PMU 26747, Unskarsheden. The chamber is filled with epiand hypsoseptal deposits (a), a layered wackestone with bird's eye structures (b), a concentration of ostracods (c) and a sparitic space (d). Picture on the right is detail of picture on the left. Left scale = 10 mm, right scale = 1 mm.
Fig. 16 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 16. Dawsonoceratidae and Proteoceratidae of the Boda Limestone. A-B. Dawsonoceras fenestratum (Eichwald, 1860), Kallholn. A. PMU 26702, nearly mature specimen with adorally decreasing angle of expansion. B. PMU 26712, juvenile specimen. C. Gorbyoceras sp. A, PMU 26772, Osmundsberget. D. Goryboceras sp. B, PMU 26773, Kallholn. E. Dawsonoceras stumburi sp. nov., PMU 26717, holotype, Kallholn. F. Gorbyoceras alternestriatum (Strand, 1934) comb. nov., PMU 26771, Unskarsheden. Scale bars: A-C, E = 10 mm; D = 10 mm; F = 10 mm.
Fig. 3 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 3. Variation in relative siphuncle size, position and angle of expansion in Cameroceras hasta (Eichwald, 1860) (grey points) and Cameroceras turrisoides sp. nov. SPR = the minimum distance of the connecting ring from the conch margin, divided by the corresponding conch height.
Fig. 7 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 7. Breviconic cephalopods of the Boda Limestone and details of an endocerid. A. Dalecarlioceras constrictum Frye, 1987, PMU 24777, holotype, Kallholn. B. Dalecarlioceras dalecarlicum (Frye, 1987) comb. nov., PMU 24774, holotype, Kallholn. C. Cyrtorizoceras thorslundi sp. nov., PMU 26658, Kallholn; note the morphological transition between D. constrictum and C. thorslundi sp. nov.; the adult size increases in Dalecarlioceras and the mature body chamber is gibbous. D. Cameroceras turrisoides sp. nov., PMU 26623, Osmundberget, lateral view of apical fragment with abrupt transition between embryonic and juvenile conch. E. Strandoceras sphinx (Schmidt, 1858), PMU 26629, Kallholn. Scale bars: A-C, E = 10 mm; D = 10 mm.
Fig. 18 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 18. Shell ornamentation of selected Cephalopoda of the Boda Formation. A. Order, gen. et sp. indet., PMU 26950, Kallholn, lateral view. B. Palaeodawsonocerina? nicolletoides sp. nov., PMU 26727, holotype, Kallholn. C. Palaeodawsonocerina senckenbergi (Teichert, 1930), PMU 26718, Kallholn. D. Geisonoceras wegelini (Angelin in Angelin & Lindström, 1880) comb. nov., PMU 26745, Unskarsheden. E. Pleurorthoceras osmundsbergense sp. nov., NRM-PZ Mo 150126, holotype, Osmundsberget. F. Warburgoceras longitudinale (Angelin in Angelin & Lindström, 1880) comb. nov., NRM-PZ Mo 154065, Unskarsheden. G. Redpathoceras depressum sp. nov., PMU 26931, Kallholn. Scale bar = 5 mm for all figures.
Fig. 21 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 21. Reconstruction of the details of the septal necks and connecting ring of Nathorstoceras sp. nov., Kallholn, Boda Limestone. A. Nathorstoceras kallholnense sp. nov., PMU 26729, holotype. B. Nathorstoceras adnatum sp. nov., PMU 26733, holotype.
Data from: Estimating dispersal and evolutionary dynamics in diploporan blastozoans (Echinodermata) across the Great Ordovician Biodiversification Event
<p><b>Echinoderms make up a substantial component of Ordovician marine invertebrates, yet their speciation and dispersal history as inferred within a rigorous phylogenetic and statistical framework is lacking. We use Biogeographic Stochastic Mapping (BSM; implemented in the R package BioGeoBEARS) to infer ancestral area relationships and the number and type of dispersal events through the Ordovician for diploporan blastozoans and related species. The BSM analysis was divided into three time slices to analyze how dispersal paths changed before and during the Great Ordovician Biodiversification Event (GOBE) and within the Late Ordovician mass extinction intervals. The best-fit biogeographical model incorporated jump dispersal, indicating this was an important speciation strategy. Reconstructed areas within the phylogeny indicate the first diploporan blastozoans likely originated within Baltica or Gondwana. Dispersal, jump dispersal, and sympatry dominated the BSM inference through the Ordovician, while dispersal paths varied in time. Long-distance dispersal events in the Early Ordovician indicate distance was not a significant predictor of dispersal, whereas increased dispersal events between Baltica and Laurentia are apparent during the GOBE, indicating these areas were important to blastozoan speciation. During the Late Ordovician, there is an increase in dispersal events among all paleocontinents. The drivers of dispersal are attributed to oceanic and epicontinental currents. Speciation events plotted against geochemical data indicate that blastozoans may not have responded to climate cooling events and other geochemical perturbations, but additional data will continue to shed light into the drivers of early Paleozoic blastozoan speciation and dispersal patterns.</b></p>
Data from: The anatomy, taphonomy, taxonomy and systematic affinity of Markuelia: Early Cambrian to Early Ordovician scalidophorans
Markuelia is a vermiform, annulated introvertan animal known as embryonic fossils from the Lower Cambrian to Lower Ordovician. Analysis of an expanded and revised dataset for Introverta shows that the precise position of Markuelia within this clade is dependent on the taxa included. As a result, Markuelia is assigned to the scalidophoran total group to reflect uncertainty as to whether it is a stem-scalidophoran or a stem-priapulid. The taxonomy of the genus is revised to provide an improved taxonomic framework for material assigned to Markuelia. Five species are recognized: M. secunda Val'kov, M. hunanensis Dong and Donoghue, M. lauriei Haug et al., M. spinulifera sp. nov. and M. waloszeki sp. nov. Finally, the preservation of Markuelia is evaluated in the light of both the taphonomy of the fossil embryos themselves and the experimental taphonomy of the priapulid Priapulus caudatus, which has been proposed as both a close relative and an anatomical analogue of Markuelia.
Paleocommunity composition, relative abundance, and new camerate crinoids from the Brechin Lagerstätte (Upper Ordovician)
<p>The Brechin Lagerstätte of southern Ontario contains an exceptionally diverse and well-preserved Late Ordovician (Katian) crinoid fauna. Here, we describe four genera and eight species of camerate crinoids from the Brechin Lagerstätte, including six new species. Consequently, the total diversity of the fauna now stands at 27 genera and 39 nominal species, thereby making it the most taxonomically diverse Ordovician crinoid fauna known. Taxa described herein include the diplobathrid <i>Pararchaeocrinus kiddi</i> n. sp. and the monobathrids <i>Glyptocrinus ramulosus</i>, <i>Periglyptocrinus priscus</i>, <i>Periglyptocrinus astricus</i> n. sp., <i>Periglyptocrinus kevinbretti</i> n. sp., <i>Periglyptocrinus mcdonaldi</i> n. sp., <i>Periglyptocrinus silvosus</i> n. sp., and <i>Abludoglyptocrinus steinheimerae</i> n. sp.</p> <p>We summarize the taxonomic composition, diversity, and abundance distribution of all known crinoids from the Brechin Lagerstätte to better characterize the paleoecological structure and complexity of the community. We establish that the fauna is dominated by the subclass Pentacrinoidea, both in terms of abundance and species richness. In addition, we analyze species-level abundance data using relative abundance distribution (RAD) models to evaluate the ecological complexity of the paleocommunity. We find that community structure of the Brechin Lagerstätte is best explained by an ecologically "complex" RAD model, which suggests species partitioned niches along multiple resource axes and/or the presence of multiple ecological ways of life. These results indicate that the Brechin Lagerstätte is significant not only for being the most taxonomically diverse Katian crinoid assemblage, but also for being an early ecologically complex fauna that developed in the wake of the Great Ordovician Biodiversification Event.</p>
Fig. 27. Scolopodus quadratus Pander, 1856 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 27. Scolopodus quadratus Pander, 1856: A–C, Pb element, AMF120472, Y4–2, A, outer lateral view, B, outer lateral view of the basal part, showing fine striae, C, inner lateral view; D–F, Sa element, AMF120475, Y4–2, D,F, lateral views, E, close up showing sharp costae and fine striae; G,H, Sb element, AMF120473, Y4–2, G, outer lateral view, H, inner lateral view; I, Sb element, AMF120471, Y4–2, inner lateral view; J–L, Sd element, AMF120474, W5, J, posterior view, K, inner lateral view, L, outer lateral view; M–O, Sc element, AMF120470, TAB1/8.1, M, outer lateral view, N, inner lateral view, O, basal view. Scale bars 100 µm.
Fig. 12 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 12 (previous page). Apical parts of orthoconic cephalopods from the Olenidsletta Member, Floian, Ordovician, near Hinlopenstretet, Ny Friesland, Spitsbergen. A. Cyptendoceras sp. B., FMNH-P30472 from Profilbekken river basin, locality PR-phosphatic. Lateral view with siphuncle toward the left. B. Svalbardoceras sterna gen. et sp. nov, FMNH-P30169, from PO 7.5. Lateral view with siphuncle toward left. C, F–G. Eosomichelinoceras borealis sp. nov. C. Specimen FMNH-P30171, from bed PO 123.3. Lateral view with prosiphuncular side toward the right. D. Bactroceras fluvii sp. nov., FMNH-P30168, from Profilbekken river basin, locality PR-phosphatic, showing the ventral side with ventral sutural lobe. E, H, J. Bactroceras boliviensis Aubrechtová, 2015 from bed PO 131. E. Specimen FMNH-P30165, nearly dorsal view, showing the transition of the extreme apical part toward the juvenile part of the conch. F. Specimen FMNH-P30182, lateral view with siphuncle toward the right. G. Specimen FMNH-P30184, lateral view with siphuncle toward the left. H. Specimen FMNH-P30183, apical view, showing the smooth apical surface of the protoconch. I. Ethanoceras solitudines gen. et sp. nov., FMNH-P30173, from bed PO 123.3, note the fine transverse striation. J. FMNH-P30160, showing details of fine transverse ornamentation. Scale bar = 2 mm for all figures.
Fig. 49 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 49. Median sections of phragmocones of cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Order, gen. et sp. indet. B, FMNH-P30424, from bed 4.8, see also Fig. 11A for interpretation. B–C. Nyfrieslandoceras bassleroceroides gen. et sp. nov., FMNH-P30353, holotype, from bed PO 131. B. Detail with septa and siphuncle preserved, septa are crushed and taphonomically distorted. C. Detail of septal necks and connecting ring, see Fig. 8D for interpretation. Scale bars: A–B = 5 mm; C = 1 mm.
Fig. 40 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 40. Diagrams of relative siphuncular diameter and relative siphuncular distance of Eosomichelinoceras borealis gen. et sp. nov. from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements.
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