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870 results for “Ordovician”
Fig. 27 in Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician)
Fig. 27. Angelinoceras latum (Angelin, 1880); reproductions of illustrations of Remelé (1890). A. Specimen MB.C.11682 from Eberswalde (Brandenburg), illustrated by Remelé (1890: pl. 1 fig. 4). B. Specimen MB.C.11683 from Heegermühle (Brandenburg), illustrated by Remelé (1890: pl. 3 fig. 3). C. Specimen MB.C.11681 from Eberswalde (Brandenburg), illustrated by Remelé (1890: pl. 1 fig. 5). Scale bar units = 1 mm.
Fig. 20. Ancistroceras barrandei Dewitz, 1880 in Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician)
Fig. 20. Ancistroceras barrandei Dewitz, 1880, reproduction of the figure provided by Noetling (1884: pl. 16 Fig. 6–6a). Scale bar units = 1 mm.
Fig. 21. Ancistroceras barrandei Dewitz, 1880 from the Upper Grey Orthoceratite Limestone. A in Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician)
Fig. 21. Ancistroceras barrandei Dewitz, 1880 from the Upper Grey Orthoceratite Limestone. A. Specimen MB.C.30518 (Neben & Krueger Coll.) from Rerik (Ostsee); previously figured by Neben & Krueger (1971: pl. 17 fig. 1). B. Specimen MB.C.30516 (Neben & Krueger Coll.) from Rerik (Ostsee). C. Specimen MB.C.11991 (Helms 1966 Coll.) from Gross Zicker (Island of Rügen). Scale bar units = 1 mm.
Fig. 15 in Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician)
Fig. 15. Species of Rhynchorthoceras from the Upper Red Orthoceratite Limestone.A. Rhynchorthoceras rugium sp. nov., holotype MB.C.11728 (Hoffmann & Gager 1972 Coll.) from Mönchgut (Island of Rügen); lateral, dorsal and ventral views. B. Rhynchorthoceras kranepuhlense sp. nov., holotype MB.C.11730 (Kummerow Coll.) from Kranepuhl (Brandenburg); ventral, lateral and dorsal views. Scale bar units = 1 mm.
Data from: Biodiversity, systematics, and new taxa of cladid crinoids from the Ordovician Brechin Lagerstätte
Upper Ordovician (Katian) strata of the Lake Simcoe region of Ontario record a spectacularly diverse and abundant echinoderm fauna known as the Brechin Lagerstätte. Despite recognition as the most taxonomically diverse Katian crinoid paleocommunity, the Brechin Lagerstätte has received relatively little taxonomic study since Frank Springer published his classic monograph on the "Kirkfield fauna" in 1911. Using a new collection of exceptionally preserved material, we evaluate all dicyclic inadunate crinoids occurring in the Brechin Lagerstätte, which is predominately comprised of cladids (Eucladida and Flexibilia). We document 15 species across 11 genera, including descriptions of two new genera and four new species. New taxa include Konieckicrinus brechinensis n. gen. n. sp., K. josephi n. gen. n. sp., Simcoecrinus mahalaki n. gen. n. sp., and Dendrocrinus simcoensis n. sp. Although cladids are not commonly considered major components of the Early Paleozoic Crinoid Macroevolutionary Fauna, which is traditionally conceived as dominated by disparids and diplobathrid camerates, they are the most diverse major lineage of crinoids occurring in the Brechin Lagerstätte. This unexpected result highlights the important roles of specimen-based taxonomy and systematic revisions in the study of large-scale diversity patterns.
FIG. 6. — A in A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera
FIG. 6. — A, Dianulites rocklandensis Wilson, 1921, tangential section showing autozooecial apertures, CEGH-UNC 27503 a; B-D, Monticulipora aff. mammulata d'Orbigny, 1850, CEGH-UNC 27516 d; B, C, tangential thin section showing autozooecial apertures; D, longitudinal thin section showing autozooecial chambers with cystiphragms; E-G. Orbignyella multitabulata Coryell, 1921; E, F, longitudinal thin section showing autozooecia with diaphragms, CEGH-UNC 27505 a; G, tangential thin section showing autozooecial apertures, CEGH-UNC 27505 b. Scale bars: A, C, 0.2 mm; B, G, 0.5 mm; D, F, 1 mm; E, 2 mm.
FIGURE 7 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 7. Reconstruction of Birmanites birmanicus (Reed). A) Dorsal skeleton; B) Hypostome.
FIGURE 1 in Diverse endobiotic symbiont fauna from the late Katian (Late Ordovician) of Estonia
FIGURE 1. Map illustrating the exposure of the Ordovician in Estonia and location of studied localities. 1- Saxby North, 2- Saxby, 3- Hosholm, 4- Paluküla, 5- Vohilaid, 6- Sutlema.
Fig. 11. Heliolitine tabulate coral Acdalopora sokolovi Bondarenko, 1958 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 11. Heliolitine tabulate coral Acdalopora sokolovi Bondarenko, 1958, from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. A. NIGP 201009. A1, A2, transverse sections. A3, longitudinal section. B. NIGP 201008. B1, B2, transverse sections. B3, longitudinal section.
Fig. 3 in Floian, Early Ordovician, trilobites from the Olongbluk Terrane, northwest China
Fig. 3. Asaphid trilobite Tsaidamaspis diarmatus Chang and Fan, 1960, from the middle part of the Duoquanshan Formation (upper Floian, Lower Ordovician) of Shihuigou, Delingha, northern Qinghai Province, China. A. NIGP 203156, cranidium. B. NIGP 203157, librigena. C. NIGP 203158, librigena. D. NIGP 203159, hypostome in dorsal (D1) and lateral (D2) views. E. NIGP 203160, pygidium. F. NIGP 203161, pygidium. G. NIGP 203162, pygidium. H. NIGP 203163, pygidium. Scale bars 5 mm.
Fig. 8. A–G in Variability of conch morphology in a cephalopod species from the Cambrian to Ordovician transition strata of Siberia
Fig. 8. A–G. Phosphatised siphuncle connecting rings of ellesmeroceratid nautiloids (interpreted below as Ruthenoceras elongatum Korde, 1949) from sample Ang-6, block No. 2, probably latest Furongian Ust-kut Formation found at Pashino on the Angara River, Siberia, Russia. ZPAL N. IV/152, 148, 147, 153, 151, 149, 150, respectively. Specimens in dorsal views, also details in higher magnification (B2 and B3; see also Dzik 2010: fig. 7f), except ventral (E1) and lateral (E2) views. ZPAL N. IV/148 and 150 (see also Dzik 2010: fig. 7b and c). H. For comparison the earliest Cambrian (Tommotian) " hyolith" Turcutheca crassaecochlia Syssoiev, 1962, ZPAL MoXX/7 from the Tommotian (Dokidocyathus lenaicus Zone) at Bydyangaia on the Lena River, central Yakutia of possible distant cephalopod affinity, probably mature specimen with displaced embryonic part preserved as a glauconitic internal mold, lateral (H1) and posterior ("ventral") (H2) views (see also Dzik 2010: fig. 7b and c).
FIGURE 6 in Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)
FIGURE 6. Chitinozoans from the Dobrotivá Formation. A-G SEM photographs of chitinozoans from the sample No. ČGS JP2016a. K-M Photographs taken in transmitted light of chitinozoans from the Cekov HJ 1 drill core. A.?Cyathochitina sp. A, Krej1_S4-7451. B.?Cyathochitina sp. A, Krej1_S1-7140. C. Euconochitina?vulgaris, Krej1_S2-7184. D. Linochitina pissotensis, Krej1_S4-7464. E.?Eremochitina sp. indet., Krej1_S3-7430. F.?Cyathochitina sp. A, Krej1_S2-7251. G.?Cyathochitina sp. A, Krej1_S2-7267. H. Desmochitina ex. gr. minor, Krej1_S2-7220. I. Linochitina pissotensis, Krej1_S2-7194. J. Linochitina pissotensis, Krej1_S4-7468. K. Linochitina pissotensis, Cekov HJ1_391. L. Linochitina pissotensis, Cekov HJ1_463. M. Linochitina pissotensis, Cekov HJ1_436. Scale bars in μm. Samples are housed as permanent slides in the Czech Geological Survey.
Figure 4 in Sheltered preservation in Ordovician trilobites
Figure 4. Sheltered trilobites from the ŠAErka and DobrotivAE formations. (A) Isolated cephalon of Eoharpes preserved upside-down under a comparatively large pygidium of Ectillaenus katzeri katzeri, MBHR 382. (B) Internal mould of Eoharpes primus preserved under a large, effaced pygidial or cephalic shield of an indeterminable asaphid or illaenid trilobite, MBHR 375. (C) Internal and external moulds of holaspid exoskeletons of Placoparia (P.) cambriensis preserved associated with the exoskeletal parts of Asaphellus desideratus, VV 290. (D) Internal mould of articulated exoskeleton of Eoharpes primus preserved under a large shield of an indeterminable asaphid or illaenid trilobite, MBHR 12251. (E) Disarticulated exoskeleton of Eoharpes primus under a large shield of an indeterminable trilobite, MBHR 335. (F) External moulds of four juvenile specimens of Placoparia sp. preserved inside an internal mould of a cranidium of an isolated cephalon of Degamella princeps, VV 102. (G) Complete articulated exoskeleton of Placoparia (P.) cambriensis preserved under the anterior part of an isolated pygidium of Asaphelus desideratus, MCZ 5136 and 5137. Ar – Arachnostega gastrochaenae. Localities: (B) Díly near Rokycany, (C)–(E) Osek, (A), (F), and (G) unknown. All specimens coated with ammonium chloride.
FIGURE 2 in Revision of the Early Ordovician (late Tremadocian; Stairsian) cheirurid trilobite Tesselacauda Ross, with species from the Great Basin, western USA
FIGURE 2.
Text-fig. 4. Palaeogeographical reconstruction of the Katian (after Popov et al. 2011, modified) showing geographical distribution of the Middle and Late Ordovician craniides and craniopsides. White arrow = Boda Event expansion of craniiates and craniopsides to Perunica; black arrow = Hirnantian low-latitude expansion of the Hirnantia Fauna. in Lingulate And Craniate Brachiopods From The Top Of The Králův Dvůr Formation (Latest Katian) And Their Contribution To Palaeogeography
Text-fig. 4. Palaeogeographical reconstruction of the Katian (after Popov et al. 2011, modified) showing geographical distribution of the Middle and Late Ordovician craniides and craniopsides. White arrow = Boda Event expansion of craniiates and craniopsides to Perunica; black arrow = Hirnantian low-latitude expansion of the Hirnantia Fauna.
Text-fig. 2. Pauxillites thaddei sp. nov., a – reconstruction of ventral side of conch with visible growth-lines and rounded lateral edges; b – reconstruction of inner surface of triclaviculate operculum with muscle scar in the area between clavicles. The dotted line represents the predicted shape of cardinal area. in Pauxillites Thaddei A New Lower Ordovician Hyolith From Morocco
Text-fig. 2. Pauxillites thaddei sp. nov., a – reconstruction of ventral side of conch with visible growth-lines and rounded lateral edges; b – reconstruction of inner surface of triclaviculate operculum with muscle scar in the area between clavicles. The dotted line represents the predicted shape of cardinal area.
Text–fig. 1. Map of the Anti-Atlas area (Morocco) with the sampled locality in the Zagora region (marked with a black star) (after Gutiérrez-Marco et al. 2003, and Sumrall and Zamora 2011). Key: a, Precambrian and Palaeozoic rocks; b, Ordovician rocks; c, post-Palaeozoic cover. in Pauxillites Thaddei A New Lower Ordovician Hyolith From Morocco
Text–fig. 1. Map of the Anti-Atlas area (Morocco) with the sampled locality in the Zagora region (marked with a black star) (after Gutiérrez-Marco et al. 2003, and Sumrall and Zamora 2011). Key: a, Precambrian and Palaeozoic rocks; b, Ordovician rocks; c, post-Palaeozoic cover.
Text-fig. 3. Pauxillites thaddei sp. nov. a – two complete ventral sides (GMSB 81383 and GMSB 81384) with complete trilobite exoskeleton (Asaphellus sp.). b – complete venter (GMSB 81382) together with part of inner surface of triclaviculate operculum (GMSB 81381). Scale bar 5 mm. in Pauxillites Thaddei A New Lower Ordovician Hyolith From Morocco
Text-fig. 3. Pauxillites thaddei sp. nov. a – two complete ventral sides (GMSB 81383 and GMSB 81384) with complete trilobite exoskeleton (Asaphellus sp.). b – complete venter (GMSB 81382) together with part of inner surface of triclaviculate operculum (GMSB 81381). Scale bar 5 mm.
Text-fig. 6. Mytoconula vonkai sp. n. Specimen NM L 31984, internal mould. A – apical, B – right lateral views, ×...... and ×....... Note the outline of an indeterminate object on which the larva settled. This specimen, embedded in a siliceous concretion, lied closely near the holotype NM L 38914. Dobrotivá F., Mýto near Holoubkov. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica
Text-fig. 6. Mytoconula vonkai sp. n. Specimen NM L 31984, internal mould. A – apical, B – right lateral views, ×...... and ×....... Note the outline of an indeterminate object on which the larva settled. This specimen, embedded in a siliceous concretion, lied closely near the holotype NM L 38914. Dobrotivá F., Mýto near Holoubkov.
Text-fig. 7. Mytoconula vonkai sp. n. Counterpart of specimen NM L 3876c, apical view showing weathered radial structures; A – ×......, B – ×....... Dobrotivá F., Malé Přílepy. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica
Text-fig. 7. Mytoconula vonkai sp. n. Counterpart of specimen NM L 3876c, apical view showing weathered radial structures; A – ×......, B – ×....... Dobrotivá F., Malé Přílepy.
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