248 research outputs found
Supplemental Figures for Hageman and Vinn, 2023
No full textSupplemental Figures 1 and 2 for Hageman and Vinn, 202
Serpulids (Annelida, Polychaeta) at Cretaceous to modern hydrocarbon seeps : ecological and evolutionary patterns
No full textSix taxa of serpulid polychaetes are reported from early Cretaceous to Miocene seep communities and their ecologic and evolutionary implications are discussed. All studied tubeworms belong to Mesozoic to modern serpulid taxa and not to any of the problematic Paleozoic tube worm clades. They are thus not ‘relic taxa’ that found refuge in these environments. The seep serpulids are not confined to a specific taxonomic group within the serpulids, but belong to at least five different genera, Propomatoceros, Nogrobs?, Hyalopomatus, Protis (or Protula), and Spirorbis? These five genera belong to the two major serpulid clades, filogranins (including spirorbins) and serpulins. No conspicuous tube morphology was observed that could be associated with the adaptation to the life in seep environments. The three identifiable genera have colonized the seep environment recently (geologically) after their first appearance in the fossil record, a pattern seen also among other taxonomic groups of vent and seep inhabitants.7 page(s
Systematics of serpulid tubeworms (Annelida, Polychaeta) from Cretaceous and Cenozoic hydrocarbon-seep deposits in North America and Europe
No full textDetailed taxonomic descriptions, including tube microstructural details, are provided for four serpulid polychaetes from Cretaceous to Miocene deep-water hydrocarbon-seep deposits, including one new species. Nogrobs? hydrocarbonicus sp. nov. from the Valanginian Bear Creek site in the Great Valley Group, California, USA, has a tube with spherulitic prismatic inner and outer layers and may be the first record of this genus from deep-water deposits. Propomatoceros sp. is recorded from the Valanginian Rocky Creek site in the Great Valley Group, California, USA, and has a similar tube microstructure to Nogrobs? hydrocarbonicus. From the Middle Eocene Humptulips Formation in western Washington, USA, we describe Hyalopomatus aff. biformis, which has a two-layered tube wall, consisting of a thin spherulitic prismatic outer layer and a thick inner layer with irregularly oriented prisms. Lastly, Protis sp. is described from a seep deposit in the late Miocene San Paolo Marls in northern Italy, which unfortunately lacks preserved tube microstructure. Comparative remarks on related fossil and extant species are provided. The state of preservation and tube microstructures of the studied serpulid species are similar to those found in shallow marine communities of similar age.11 page(s
Ultrastructure and mineral composition of serpulid tubes (Polychaeta, Annelida)
No full textFigure 3. A–B, Neovermilia falcigera, irregularly oriented platy structure, outer tube layer. A, cross section. B, longitudinal section. C–D, Bathyvermilia langerhansi, homogeneous angular crystal structure, outer tube layer. C, cross section. D, longitudinal section. E–F, Pomatostegus stellatus, homogeneous rounded crystal structure. E, cross section. F, longitudinal section. All samples were polished and treated with 1% acetic acid for 2 min. Abbreviations: exter, exterior.Published as part of Vinn, Olev, Ten Hove, Harry A., Mutvei, Harry & Kirsimäe, Kalle, 2008, Ultrastructure and mineral composition of serpulid tubes (Polychaeta, Annelida), pp. 633-650 in Zoological Journal of the Linnean Society 154 (4) on page 639, DOI: 10.1111/j.1096-3642.2008.00421.x, http://zenodo.org/record/544560
Propomatoceros Ware 1975
No full textGenus <i>Propomatoceros</i> Ware, 1975 <p> TYPE SPECIES. — <i>Propomatoceros sulcicarinata</i> Ware, 1975 by original designation.</p>Published as part of <i>Vinn, Olev, Hryniewicz, Krzysztof, Little, Crispin T. S. & Nakrem, Hans A., 2014, A Boreal serpulid fauna from Volgian-Ryazanian (latest Jurassic-earliest Cretaceous) shelf sediments and hydrocarbon seeps from Svalbard, pp. 527-540 in Geodiversitas 36 (4)</i> on page 532, DOI: 10.5252/g2014n4a2, <a href="http://zenodo.org/record/5377303">http://zenodo.org/record/5377303</a>
Symbiosis in Late Devonian-Mississippian corals: a review
No full textThere are four symbiotic associations involving corals known from the Late Devonian. Corals formed at least six symbiotic associations in the Mississippian, most of which involved crinoids. There was an escalation in the abundance and complexity of coral symbiosis from the Ordovician into the Devonian, and no decline in the Carboniferous. Coral symbiosis after the Kellwasser biotic crises was impoverished and presumably did not recover to Middle Devonian levels in the early Carboniferous. Recovery of symbiotic associations after the Hangenberg Event was due to the re-establishment of associations known from earlier Palaeozoic times and appearance of new symbiotic associations. The lack of various worm bioclaustrations and endobiotic tentaculitoid tubeworms in Carboniferous corals is the main difference from the Ordovician, Silurian, and Devonian coral symbiosis. Late Devonian symbiotic associations involving corals are different from early Carboniferous associations
Occurrence, formation and function of organic sheets in the mineral tube structures of Serpulidae (polychaeta, Annelida).
No full textA scanning electron microscopy study of organic sheets in serpulid tube mineral structures was carried out to discern their function, formation and evolution. The organic sheets may have some taxonomic value in distinguishing the two major clades of serpulids previously identified. The organic sheets in the mineral tube structure occur only in certain taxa belonging to clade A, but not all species in clade A have them. Organic sheets are best developed in genus Spirobranchus. One could speculate that organic sheets have evolved as an adaption to further strengthen the mechanical properties of the tubes in clade A, which contains serpulids with the most advanced mineral tube microstructures. The organic sheets are presumably secreted with at least some mineral phase
Distribution des perforations de vers dans les coquilles de brachiopodes des schistes bitumineux du Caradoc d'Estonie
No full textDes perforations dues à des vers sont observées en abondance sur les coquilles de quelques brachiopodes (Clitambonites, Estlandia, Nicolella) des schistes bitumineux caradociens du Nord de l'Estonie. Ainsi, 9 des 21 genres de brachiopodes (43 %) étudiés ont des valves perforées. La présence ou l'absence des perforations est liée à taille et l'épaisseur des valves. Les autres traits morphologiques semblent n'avoir aucune importance. Dans l'ensemble, en effet, les larves des vers marquent une préférence pour des coquilles épaisses et lamelleuses, comme celles des clitambonitidés, particulièrement Clitambonites schmidti. On note, cependant que les représentants de l'ichnogenre Trypanites marquent quelques préférences spécifiques, ainsi leur fréquence varie de 6.5 % chez Bekkerina à 51 % chez Estlandia. La majorité des perforations sont orientées et les coquilles d'individus vivants étaient préférées aux coquilles vides. Certains brachiopodes clitambonitidés, comme Clitambonites schmidti, ont toléré un grand nombre de perforations dans leurs valves. Seul un petit nombre de valves trouées ont révélées des cals de réparation de la coquille sur leur face interne.Abundant worm borings were found in some brachiopod shells (Clitambonites, Estlandia, Nicolella) from the Ordovician (Caradoc) oil shale in North Estonia. 9 of 21 brachiopod genera (43 %) have been bored. Excluding the size and thickness of valves, no common morphological feature discriminates the brachiopods with borings from those without them. The Trypanites are host-specific, and the frequency of bored valves varies from 6.5 % in Bekkerina to 51 % in Estlandia. The worm larvae preferred hosts with thick lamellose shells, such as those of the clitambonitids, especially Clitambonites schmidti. The boring organisms were size-selective; they preferred large adult specimens. The majority of the borings are oriented, and living hosts were preferred to dead shells. Some clitambonitidine brachiopods, like C. schmidti tolerated a large number of the borer's shafts in their valves. Few bored valves have the blister-like shell-repair structures in their interior
Ordovician and Silurian Trace Fossils of Estonia. Ordoviitsiumi ja Siluri ajastu j\ue4ljekivistised Eestis
No full textHow to solve the problem of inherited behavior patterns and increase the sustainability of technological civilization
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