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870 results for “Ordovician”
Fig. 10 in Ordovician opabiniid-like animals and the role of the proboscis in euarthropod head evolution
Fig. 10 | Simplified results of phylogenetic analyses and a putative pathway of evolution of key head characters within the euarthropod lower stem group. Dotted lines indicate nodes where some analyses resolved polyphyletic or paraphyletic relationships. Full phylogenetic results provided in Supplementary Figs. 6–11.
FIGURE 4 in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 4. Phylogenetic relationships of the genus Prophyllodictya Gorjunova, 1987
Fig. 9 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus
Fig. 9. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia); ZPAL Pb 6/1. SEM micrograph showing differ2 ent types of periderm perforation. Abbreviations: l, large opening, m, medium opening, s, small opening.
Fig. 1 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus
Fig. 1. Melanostrophus fokini Öpik, 1930. Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia). Fragment of the specimen, preserved in the limestone 2 matrix; ZPAL Pb 6/1. SEM micrographs. A. Fragment of a middle part of the colony made of rather closely packed tubes. B, C. Lateral offshoots of the tubes. D. Tubes connected with the anastomosis. E. Part of a distal portion of the colony made of loosely arranged tubes. F. Bifurcation of the tube. Abbreviations: a, anastomosis; b, bundle of tubes; m, matrix; o, lateral offshoot of the tube; t, tube. Arrows in B indicate fusellar sutures or their impressions.
Fig. 6 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus
Fig. 6. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia); ZPAL Pb 6/1. SEM micrographs. A–C. De2 tails of ectocortex. Abbreviations: b, bundle of cortical fibrils; cf, cortical fibril; h, homogenous material within the cortical tissue.
Fig. 4 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus
Fig. 4. Melanostrophus fokini Öpik, 1930; Upper Ordovician (Kukruse Stage, C β Ubja); ZPAL Pb 6/1. TEM micrographs. A, B. Transverse sec2 tions of the tube wall showing homogenous and fibrillar ultratructure. Abbreviations: f, fibril; h, homogenous material.
Data from: Identifying the most surprising victims of mass extinction events: an example using Late Ordovician brachiopods
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Data from: Biodiversity, systematics, and new taxa of cladid crinoids from the Ordovician Brechin Lagerstätte
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Data from: Evolutionary and biogeographical shifts in response to the Late Ordovician mass extinction
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Data from: Estimating dispersal and evolutionary dynamics in diploporan blastozoans (Echinodermata) across the Great Ordovician Biodiversification Event
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Paleocommunity composition, relative abundance, and new camerate crinoids from the Brechin Lagerstätte (Upper Ordovician)
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Data from: Comparing taxonomic and geographic scales in the morphologic disparity of Ordovician through Early Silurian Laurentian Crinoids
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Data from: Graptoloid diversity and disparity became decoupled during the Ordovician mass extinction
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Supplemental information for: An early burst in brachiopod evolution corresponding with significant climatic shifts during the great Ordovician biodiversification event
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Data from: The anatomy, taphonomy, taxonomy and systematic affinity of Markuelia: Early Cambrian to Early Ordovician scalidophorans
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Data from: Phylogenetic clustering of origination and extinction across the Late Ordovician mass extinction
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Data from: Dissecting the paleocontinental and paleoenvironmental dynamics of the Great Ordovician Biodiversification
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Data from: Effects of mass extinction and recovery dynamics on long-term evolutionary trends: a morphological study of Strophomenida (Brachiopoda) across the Late Ordovician mass extinction
Mass extinctions affect the history of life by decimating existing diversity and ecological structure and creating new evolutionary and ecological pathways. Both the loss of diversity during these events and the rebound in diversity following extinction had a profound effect on Phanerozoic evolutionary trends. Phylogenetic trees can be used to robustly assess the evolutionary implications of extinction and origination. We examine both extinction and origination during the Late Ordovician mass extinction. This mass extinction was the second largest in terms of taxonomic loss but did not appear to radically alter Paleozoic marine assemblages. We focus on the brachiopod order Strophomenida, whose evolutionary relationships have been recently revised, to explore the disconnect between the processes that drive taxonomic loss and those that restructure ecological communities. A possible explanation for this disconnect is if extinction and origination were random with respect to morphology. We define morphospace using principal coordinate analysis (PCO) of character data from 61 Ordovician-Devonian taxa and their 45 ancestral nodes, defined by a most parsimonius reconstruction in Mesquite. A bootstrap of the centroid of PCO values indicates that genera were randomly removed from morphospace by the Late Ordovician mass extinction, and new Silurian genera were clustered within a smaller previously unoccupied region of morphospace. Diversification remained morphologically constrained throughout the Silurian and into the Devonian. This suggests that the recovery from the Late Ordovician mass extinction resulted in a long-term shift in strophomenide evolution. More broadly, recovery intervals may hold clues to understanding the evolutionary impact of mass extinctions.
Data from: A new craniid brachiopod genus from the terminal Ordovician Hirnantia fauna of Myanmar and South China
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Data from: Effects of mass extinction and recovery dynamics on long-term evolutionary trends: a morphological study of Strophomenida (Brachiopoda) across the Late Ordovician mass extinction
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