Lingulasma tenuigranulata - Palaeoecology of a large Ordovician linguloid that lived within a strophomenid-trilobite community (original) (raw)
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A low diversity Sinuites gastropod community from the Floian, Early Ordovician, of South Wales
2021
A low diversity Sinuitesdominated gastropod community is described from the Floian, Arenig Series, of the Llangynog Inlier, southwest of Carmarthen, South Wales. The abundant material comes from shallowwater siltstone and mudstone beds of the Bolahaul Member of the Ogof Hên Formation. The locality has an exceptionally diverse molluscdominated fauna (63.5% of the fauna), with gastropods constituting 6% and tergomyans 1% and echinoderms, arthropods and other fauna making up the rest. Except for one rare tergomyan mollusc, identified as Carcassonnella cf. vizcainoi, other tergo myans are described elsewhere. Nearly half of all gastropod specimens are represented by Sinuites ramseyensis. Three of the five taxa described are new: Mimospira llangynogensis sp. nov., Catalanispira prima sp. nov., and Ceratopea? moridunensis sp. nov. The assemblage compares best with those of contemporaneous highlatitude periGondwana areas. Early Ordovician species of Carcassonnella are typically found...
A low diversity Sinuites community from the Floian, Lower Ordovician, of South Wales
Acta Palaeontologica Polonica
A low diversity Sinuitesdominated gastropod community is described from the Floian, Arenig Series, of the Llangynog Inlier, southwest of Carmarthen, South Wales. The abundant material comes from shallowwater siltstone and mudstone beds of the Bolahaul Member of the Ogof Hên Formation. The locality has an exceptionally diverse molluscdominated fauna (63.5% of the fauna), with gastropods constituting 6% and tergomyans 1% and echinoderms, arthropods and other fauna making up the rest. Except for one rare tergomyan mollusc, identified as Carcassonnella cf. vizcainoi, other tergo myans are described elsewhere. Nearly half of all gastropod specimens are represented by Sinuites ramseyensis. Three of the five taxa described are new: Mimospira llangynogensis sp. nov., Catalanispira prima sp. nov., and Ceratopea? moridunensis sp. nov. The assemblage compares best with those of contemporaneous highlatitude periGondwana areas. Early Ordovician species of Carcassonnella are typically found in France, Iberia, Czech Republic, and Morocco, while species of Mimospira are found in Germany and Czech Republic, but also in Baltica where the main radiation took place later. Two of the oldest occurrences of Mimospira are from Avalonian Wales (Carmarthenshire and Anglesey). Catalanispira occurs later in Baltica and Laurentia in the late Middle and early Late Ordovician, when taxa from these areas start to appear in Wales and vice versa. The presence of Ceratopea?, a genus typical of Laurentia, is at odds with the biogeographic distribution of faunas at this time. Part of the observed distribution pattern may be explained by different latitudinal position and facies depths of Avalonia compared to Armorica, Bohemia, and Morocco. The species described herein are amongst the first Floian taxa of these groups formally described from this area and add significantly to the global Floian record.
Bitner, M. A., Dulai, A., Kocsis, L. & Müller, P. M., 2012. Lingula dregeri (Brachiopoda) from the Mid dle Mio cene of Hun gary. Annales Societatis Geologorum Poloniae, 82: 39-43.
First record of Lingula (Brachiopoda) from the Miocene of France, with diagnosis of L. dregeri
Comptes Rendus Palevol, 2007
The brachiopod Lingula dregeri Andreae, 1893 has been found in the Middle Miocene of southwestern France, at Salles. This is the first record of the genus Lingula Bruguière from the Miocene of France. Good preservation makes it possible for us to offer the first diagnosis of this species and to complete its description. Examination of the occurrences of Lingula in the Miocene of Europe revealed that all of them are one species, L. dregeri. The Serravallian environment at Salles was marine, sublittoral and sheltered, with a substrate of fine carbonated sands, laid down in subtropical-to-warm temperate waters. To cite this article: C.C. Emig et al., C. R. Palevol 6 (2007).
Geological Magazine
A new odontopleurid trilobite, Meadowtownella serrata, is described from a new Llanvirnian (Darriwilian; Didymograptus murchisoni Biozone) locality in the Builth Inlier, Mid-Wales. This unusually spinose species displays a remarkable array of pygidial spines and extends the stratigraphic range of the genus back into the Abereiddian. Benthic faunas are rare in the predominantly 'anoxic' D. murchisoni Biozone of the Welsh Basin, and these beds are an unusual habitat for odontopleurids. Environmental analyses (framboidal pyrite and associated total organic carbon) in this study, together with the distribution of benthic faunas (described and figured) in the section, indicate a likely oxic water column and episodically oxic bottom waters. A new diagnosis for Meadowtownella is presented with a review of the genus, as a clarification of previous work. The greater spinosity of earlier members of the lineage may reflect either changing environmental preferences, or the derivation of Meadowtownella from an original more spinose lineage.
Chapter 10 Biogeography of Ordovician linguliform and craniiform brachiopods
Geological Society, London, Memoirs, 2013
The biogeographical patterns shown by Ordovician linguliform and craniiform brachiopods are greatly influenced by their dominance in low-diversity associations in marginal environments. This is particularly evident in the Early Ordovician, when linguliform-dominated dysaerobic assemblages are widely distributed along the deep shelves of Gondwana, the Kazakhstanian terranes and in Baltica. By the Darriwilian, micromorphic linguliforms are characteristic components of the pantropical climatic-controlled faunas of Laurentia, Cuyania and Kazakhstanian terranes, which-in spite of separation by extensive oceans-retain a distinct similarity. Analysis of craniiform biogeographical distribution is impeded significantly by the poor state of craniide taxonomy and lack of reliable data from most regions. However, in general their biogeographical dispersion is similar to other groups of the Palaeozoic Evolutionary Fauna. Unlike the linguliforms, which are important members of the Cambrian Evolutionary Fauna, there is no convincing Cambrian craniiform record; they may have evolved and dispersed from Gondwana and associated microcontinents and island arcs. The earliest well-established record is from the late Tremadocian of temperate to high-latitude peri-Gondwana. During most of the Ordovician, they have a peri-Iapetus distribution. They are very rare or absent in tropical Gondwana, South China and Kazakhstanian terranes and are not yet documented from Siberia. The trimerellides probably evolved in tropical peri-Gondwanan island arc settings. Their dispersion and major features of biogeography mirror those of atrypides. Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.
Geologica Belgica, 2022
Lower Ordovician linguliformean brachiopods from the Stavelot–Venn Massif (Belgium and Germany) are described systematically for the first time. The material comprises specimens from the Jalhay (Solwaster Member) and Ottré (Les Plattes Member) formations of Tremadocian and Floian ages, respectively. The Solwaster Member yielded a relatively diverse assemblage of nine species of lingulide (e.g. Lingulella lata, Lithobolus sp., Broeggeria sp.) and acrotretide (Acrotreta? sp.) whereas only one siphonotretide species (Celdobolus sp.) is recognised from the base of the Les Plattes Member where it is associated with conodonts of the Paroistodus proteus Zone. The assemblage from the Solwaster Member, although not abundant, is much more diverse than that of the contemporaneous Chevlipont Formation in the Brabant Massif (Thyle Valley, Belgium). Some of the taxa identified in the Stavelot–Venn Massif represent some of the youngest occurrences and first occurrences documented in Avalonia.
Ichnofossils associated with lingulide shells from the Lower Permian of Brazil
Carnets de Geologie, 2019
Abstract: Lingulides from Lower Permian of Brazil (24% substrates) showed signs of bioerosion in form of multiple small shallow pits that resemble incomplete Oichnus paraboloides borings. A single lingulide valve showed a centrally located large circular predatory Oichnus simplex boring. Several lin-gulide shells (c. 21%) show small Arachnostega traces in their interior. The diameter of Arachnostega burrows is relatively constant. These burrows are more similar to juvenile stages of Arachnostega gastrochaena and do not form well-developed meshwork of tunnels. This is the first record of Arachno-stega from the interior of lingulide shells and indicates that even very small lingulide shells were suitable substrates for cryptic organisms. Résumé : Ichnofossiles associés à des coquilles de lingulides du Permien inférieur du Bré-sil.-Les lingulides du Permien inférieur du Brésil (24% des substrats) portent des traces de bio-éro-sion sous forme de nombreux petits trous peu profonds qui ressemblent à des perforations incomplètes d'Oichnus paraboloides. Une seule coquille de lingulide montre une grande perforation prédatrice circu-laire d'Oichnus simplex localisée en son centre. Plusieurs coquilles de lingulides (environ 21%) présen-tent des traces d'Arachnostega à l'intérieur. Le diamètre des terriers d'Arachnostega est relativement constant. Ces terriers sont très semblables aux stades juvéniles d'Arachnostega gastrochaena et ne forment pas de réseaux de tunnels bien développés. C'est la première mention d'Arachnostega à l'inté-rieur de coquilles de lingulides et ce qui prouve que des coquilles de lingulides, même très petites, pouvaient constituer un substrat convenable pour des organismes cryptiques.
Lingula is often considered a "living-fossil" based on its supposed lengthy morphological conservatism owing to its absence of evolution, and its remarkable survival for more than 550 M.Y. This conclusion is based on the typical apparently unchanged "linguliform" shape of the shell. However the taxa of the family Lingulidae show morphological evolutionary changes despite the fact that the group appears panchronic among the Recent Brachiopoda. Consequently, traditional opinion that Lingula is a "living-fossil" should be rejected. Diagnoses of the Family Lingulidae and of its three genera are herewith emended.