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527 results for “Mesozoic.”
Fig. 3 in Mastigocoleidae fam. nov., a New Mesozoic Beetle Family and the Early Evolution of Dryopoidea (Coleoptera)
Fig. 3. Habituk of Mastigocoleus rhinocerosTihelca & Cai gen. et kp. nov. from the;arly Cretaceouk Crato Formation in northeaktern Brazil. (A) holotype (SMNS 66552); (B) paratype (AMNH SA43296). Scale bark = 1 mm.
Fig. 11 in Mastigocoleidae fam. nov., a New Mesozoic Beetle Family and the Early Evolution of Dryopoidea (Coleoptera)
Fig. 11. Geographical diktribution of Maktigocoleidae during the Cretaceouk (late Albian, 101 Ma), marcing the locationk of the fokkil depokitk prekerving whipantennate beetlek.
Fig. 2 in Mastigocoleidae fam. nov., a New Mesozoic Beetle Family and the Early Evolution of Dryopoidea (Coleoptera)
Fig. 2. Morphological detailk of Mastigocoleus resinicola Tihelca & Cai gen. et kp. nov. (NIGP174708) from the mid-Cretaceouk amber from northern Myanmar. (A) Head in dorkal view; (B) compound eye in dorkal view; (C) mouthpartk in ventral view; (D) antenna; (;) elytra; (F) thorax in ventral view; (G) metathoracic leg. Abbreviationk: a1–11, antennomerek 1–11; cx3, metacoxa; e, compound eye; fm1, profemur; fm2, mekofemur; fm3, metafemur; lb2–3, labial palpomerek 2–3; mca, mekoventral cavity; me, mentum; mp2–4, maxillary palpomerek 2–4; mtt5, metatarkuk 5; ppr, prokternal procekk; km, kubmentum; tb, metatibia; tb2, mekotibia; tc3, trochanter of metathoracic leg. Scale bark = 100 μm (B, G); 250 μm (A, C); 500 μm (D, F), 1 mm (;).
Fig. 1 in Mastigocoleidae fam. nov., a New Mesozoic Beetle Family and the Early Evolution of Dryopoidea (Coleoptera)
Fig. 1. Habituk of Mastigocoleus resinicola Tihelca & Cai gen. et kp. nov. (NIGP174708) from the mid-Cretaceouk amber from northern Myanmar in (A) dorkal and (B) ventral viewk. Scale bark = 1 mm.
Preservation of corneous beta proteins in Mesozoic feathers
<p><strong>S-XANES data. </strong>Small samples (≥3 mm<sup>2</sup>) of untreated and experimentally degraded feathers in addition to fossil material and samples of host sediment were placed on low-sulfur mylar tape and analyzed at the Stanford Synchrotron Radiation Lightsource (SSRL) using synchrotron X-ray absorption near-edge spectroscopy (XANES) at beam line 6-2. S-XANES data were collected in fluorescence mode using a single element Vortex silicon drift detector set at an angle of ~90° to the incident beam to minimize the scatter signal. The incident x-ray energy was selected using a Si(111) monochromator, which was calibrated using a Na<sub>2</sub>S<sub>2</sub>O<sub>3 </sub>standard with the thiol pre-edge peak defined as 2472.02 eV. S-XANES standards for selected S-bearing compounds, representing different S species, were prepared by mixing commercially available analytical standards (Sigma Aldrich; ≥98% pure) with BN to obtain a S concentration of ca. 5 wt% in each standard. Data alignment, averaging, background subtraction and normalisation were performed using Athena v. 0.9.26.</p> <p> </p> <p><strong>FTIR data.</strong> Fossil data were collected in the 4000–600 cm<sup>-1</sup> range using a PerkinElmer Frontier FTIR spectrometer fitted with a Spotlight 400 microscope. Each spectrum was collected as an average of 8–36 scans. Spectra for untreated and matured feathers were collected in the 4000–500 cm<sup>-1</sup> range using a universal diamond ATR accessory on the Frontier spectrometer. Each spectrum was collected as an average of 10 scans. Each spectrum was baseline-corrected using SpectraGryph v. 1.2.7 using the parameters adaptive correction, 15% coarseness and no offset. In addition, interactive baseline correction was performed on data in the region 898–450 cm<sup>-1</sup> using Spectrum IR v. 10.6.1 (PerkinElmer, USA). This ensured a consistent baseline across the entire scan range to facilitate spectral comparison. Each spectrum was standardized to remove sample thickness effects.</p>
Data from: First record of the Mesozoic scroll coprolites: classification, characteristics, elemental composition and probable producers
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Data from: Variations of mesozoic feathers: insights from the morphogenesis of extant feather rachises
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Data and script for: The patterns and modes of the evolution of disparity in Mesozoic Birds
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Data from: Rates of dinosaur limb evolution provide evidence for exceptional radiation in Mesozoic birds
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Selecting and averaging relaxed clock models in Bayesian tip dating of Mesozoic birds
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Data from: Mesozoic cupules and the origin of the angiosperm second integument
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Data from: The fragmentation of Pangaea and Mesozoic terrestrial vertebrate biodiversity
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Data from: Local and global abundance associated with extinction risk in late Paleozoic and early Mesozoic gastropods
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Data from: Near-stasis in the long-term diversification of Mesozoic tetrapods
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Data from: Lepidosaurian diversity in the Mesozoic–Paleogene: the potential roles of sampling biases and environmental drivers
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Data from: Bone-eating Osedax worms lived on Mesozoic marine reptile deadfalls
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Data from: The first iguanian lizard from the Mesozoic of Africa
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The role of bioturbation-driven substrate disturbance in the Mesozoic brachiopod decline
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FIGURE 1 in Review of Mesozoic Perissommatidae (Insecta: Diptera)
FIGURE 1. Distribution map of extinct (open circles) and extant (closed circles) Perissommatidae.
Data from: A unique hybodontiform skeleton provides novel insights into Mesozoic chondrichthyan life
<p class="CxSpFirst"><i>Asteracanthus </i>apparently was one of the most common Mesozoic hybodontiform chondrichthyans, as remains traditionally referred to this genus have been reported almost worldwide from Middle Triassic to Late Cretaceous strata so far. <i>Asteracanthus</i> was erected by Louis Agassiz for Late Jurassic fin spines with stellate tubercles. Later, Arthur Smith Woodward synonymized <i>Strophodus</i>, originally introduced by Agassiz for distinctive crushing teeth of Triassic to Cretaceous age, with <i>Asteracanthus </i>based on associated teeth and spines from the English Middle Jurassic. This taxonomic scheme has been accepted for more than 130 years until now, although articulated material has never been found. Here, we present a unique hybodontiform skeleton from the German Late Jurassic, displaying a striking combination of characters: tuberculate dorsal fin spines reminiscent of <i>Asteracanthus</i> and multicuspid teeth that markedly differ from the crushing teeth previously referred to this genus. Using qualitative and quantitative approaches, we compared its fin spines to those that were found in association with Agassiz's <i>Strophodus</i> teeth, providing evidence that <i>Asteracanthus</i> and <i>Strophodus</i> in fact represent two valid genera distinct from all other hybodontiforms. Morphological features that distinguish fin spines of <i>Strophodus</i> from those of all other hybodontiforms include a straight anterior border and distally distributed posterior denticles. These observations led us to present an emended diagnosis for <i>Asteracanthus</i>. Dentally, <i>Asteracanthus</i> shows strong resemblance to<i> Hybodus</i>, but<i> </i>it otherwise lacks a palatobasal process on the palatoquadrate. Therefore, and in the absence of any reliable phylogenetic framework, we recommend treating <i>Asteracanthus</i> as <i>incertae</i> <i>familiae </i>until hybodontiform interrelationships are resolved.</p>
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