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492 results for “Silurian”
FIGURE 3. Gothograptus auriculatus n in Evolutionary significance of the retiolitine Gothograptus (Graptolithina) with four new species from the Silurian of the East European Platform (Baltica), Poland and Lithuania
FIGURE 3. Gothograptus auriculatus n. sp., fragments of distal parts of tubaria showing a thick nema, Bartoszyce IG-1, depth 1647.2 m, praedeubeli Biozone, Poland. A–B, distal end of tubarium with broken appendix, ZPAL G.55/4, A, fragment with beginning of appendix, B, enlargement of last thecal region showing thick nema. C, lateral view of fragment of medial part of tubarium, ZPAL G.55/5.
FIGURE 22. A–F in Evolutionary significance of the retiolitine Gothograptus (Graptolithina) with four new species from the Silurian of the East European Platform (Baltica), Poland and Lithuania
FIGURE 22. A–F. mature tubarium of Gothograptus velo n. sp., holotype, Zawada 1 core, depth 1533.3–1540.0 m, upper part of lundgreni Biozone, Poland, ZPAL G.XIII/35, specimen with nine pairs of thecae. A. lateral-ventral view of specimen; B. enlargement of distal part of tubarium; C. enlargement of proximal end; D. view of outer ancora from outside; E–F. enlargements of th71. Abbreviations: anc.—ancora, lat. ap.—lateral apertural, v.—ventral, th—theca.
FIGURE 6 in Evolutionary significance of the retiolitine Gothograptus (Graptolithina) with four new species from the Silurian of the East European Platform (Baltica), Poland and Lithuania
FIGURE 6. Internal view of the structural features of the thecal framework of Gothograptus. A. Pleural list and socket, ZPAL G.55/40; B. View looking distally of lateral apertural rod curving distally into ventral lip, ZPAL G.55/41; C, E, nema with connecting rod, ZPAL G.55/41, ZPAL G.55/37; D, G. pleural list at side of thecal orifice, ZPAL G.55/42, ZPAL G.55/41. F. midventral list with traces of zigzag fusellar suture, their courses shown by the white bars. ZPAL G.55/43. A–E, G. Mulde Marl, Blåhäll, Gotland, Sweden Locality 813-832, Blåhäll 1 (Spjeldnaes 1984). F. Mulde Marl, Dapps 2, Gotland, Sweden (Calner & Jeppsson 2003). H. internal diagrammatic representation of the lists. The seams are coloured brown.
Data from: Harnessing stratigraphic bias at the section scale: conodont diversity in the Homerian (Silurian) of the Midland Platform, England
Fossil abundance and diversity in geological successions are subject to bias arising from shifting depositional and diagenetic environments, resulting in variable rates of fossil accumulation and preservation. In simulations, this bias can be constrained based on sequence-stratigraphic architecture. Nonetheless, a practical quantitative method of incorporating the contribution of sequence-stratigraphic architecture in community palaeoecology and diversity analyses derived from individual successions is missing. As a model of faunal turnover affected by the stratigraphic bias, we use the 'Mulde event', a postulated mid-Silurian interval of elevated conodont turnover, which coincides with global eustatic sea-level changes and which has been based on regionally constrained observations. We test whether conodont turnover is highest at the boundary corresponding to the 'event' and post-'event' interval against the alternative that conodont turnover reflects habitat tracking and peaks at facies shifts. Based on the previously documented, parasequence-level stratigraphic framework of sections in the northern and central part of the Midland Platform, the relative controls of sequence-stratigraphic architecture, time and depositional environment over conodont distribution are evaluated using permutational multivariate analysis of variance. The depositional environment controls the largest part of variability in conodont assemblage composition, whereas the postulated 'Mulde event', or genuine temporal change in conodont diversity, cannot be detected. Depending on the binning of the stratigraphic succession, contrasting diversity and turnover patterns can be produced. The simple approach proposed here, emulating partitioning of β diversity into spatial and temporal components, may help to constrain the stratigraphic bias, even at the scale of an individual section.
Supplementary data for: A Silurian (Homerian) pelmatozoan echinoderm fauna from west-central Ohio
<p>A diverse echinoderm fauna lived in reef and non-reef Silurian facies of the upper Midwestern United States. However, these faunas are dominantly preserved in dolostones with fossils preserved only as molds and casts, and fossils from dolostone facies have not been documented to the extent of Silurian crinoids in non-dolostone strata. Herein, an echinoderm fauna is described from the dolostones of the Cedarville Member of the Laurel Limestone (Wenlock, Homerian) from the Pepcon Quarry in west-central Ohio. The described fauna contains blastoids, hemicosmitoids, and crinoids, including <em>Troosticrinus</em> <em>subcylindricus</em> (Hall and Whitfield, 1875); <em>Caryocrinites</em> sp.; an unidentifiable diplobathrid camerate, <em>Periechocrinus</em> <em>tennesseensis</em> (Hall and Whitfield, 1875); <em>Periechocrinus</em> <em>egani</em>? Miller, 1881; <em>Stiptocrinus</em> <em>farringtoni</em> (Slocom, 1908); <em>Calliocrinus</em> <em>primibrachialis</em> Busch, 1943; <em>Calliocrinus</em> <em>popplemani</em> n. sp.; <em>Calliocrinus</em> <em>hadros</em> n. sp.; and <em>Lecanocrinus</em> sp. Generic concepts for the Eucalyptocrinitidae are clarified; and, surprisingly, Eucalyptocrinites is absent from this fauna.</p>
Data from: Newly discovered morphology of the Silurian sea spider Haliestes and its implications
<p>The three-dimensionally preserved Haliestes dasos from the Silurian (Wenlock) Lagerstätte is the most complete fossil sea spider and the oldest unambiguous pycnogonid known from the fossil record. The discovery of two new specimens to add to the holotype reveals new features including proximal annulations of the appendages and segmentation of the trunk end, critical details for comparison with pycnogonids from the Devonian (Emsian) Hunsrück Slate and for the interpretation of the evolutionary significance of Palaeozoic genera. There is some evidence of sexual dimorphism. H. dasos was nektobenthic and its morphology indicates an unusual mode of feeding compared to living pycnogonids. The new morphological features of H. dasos are closely similar to those in Palaeoisopus problematicus from the Hunsrück Slate and it clearly belongs, together with that species, in stem Pycnogonida and not the crown group.</p>
Data from: A well-preserved respiratory system in a Silurian ostracod
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Data from: Size, shape, and systematics of the Silurian trilobite Aulacopleura koninckii
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Data from: New crinoids from the Baltic region (Estonia): fossil tip-dating phylogenetics constrains the origin and Ordovician–Silurian diversification of the Flexibilia (Echinodermata)
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Data from: Axial growth gradients across the postprotaspid ontogeny of the Silurian trilobite Aulacopleura koninckii
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Data from: Kalana Lagerstatte crinoids: early Silurian (Llandovery) of central Estonia
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Data from: Newly discovered morphology of the Silurian sea spider Haliestes and its implications
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Data from: An edrioasteroid from the Silurian Herefordshire Lagerstätte of England reveals the nature of the water vascular system in an extinct echinoderm
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Data from: Harnessing stratigraphic bias at the section scale: conodont diversity in the Homerian (Silurian) of the Midland Platform, England
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Data from: Three-dimensionally preserved soft-tissues and calcareous hexactins in a Silurian sponge: implications for early sponge evolution.
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Data from: preserved appendages in a Silurian binodicope: implications for the evolutionary history of ostracod crustaceans
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Data from: A new ophiocistioid with soft-tissue preservation from the Silurian Herefordshire Lagerstätte, and the evolution of the holothurian body plan
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Data from: A new crustacean from the Herefordshire (Silurian) Lagerstätte, UK, and its significance in malacostracan evolution
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Data from: A three-dimensionally preserved lobopodian from the Herefordshire (Silurian) Lagerstätte, UK
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Data from: A Silurian short-great-appendage arthropod
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