A 390 million-year-old hyper-compound eye in Devonian phacopid trilobites
Scientific Reports, 2021 Trilobites, extinct arthropods that dominated the faunas of the Palaeozoic, since their appearance c 523 million years ago, were equipped with elaborate compound eyes. While most of them possessed apposition compound eyes (in trilobites called holochroal
B. Schoenemann +5 more
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The earliest cornulitid on the internal surface of the illaenid pygidium from the Middle Ordovician of Estonia [PDF]
Estonian Journal of Earth Sciences, 2017 The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group.
Olev Vinn, Ursula Toom, Mare Isakar
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Preparation and mounting of a sperm whale (Physeter macrocephalus Linnaeus, 1758) at the Natural History Museum in Oslo, Norway [PDF]
Natural History Collections and MuseomicsIn this report, we detail the process undertaken for preparing and mounting a sperm whale skeleton (Physeter macrocephalus Linnaeus, 1758) specimen for exhibition at the Natural History Museum of Oslo, University of Oslo, which was displayed in 2022.
Maximo A. Rojo +6 more
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Cruziana traces from the Late Silurian (Pridoli) carbonate shelf of Saaremaa, Estonia [PDF]
Estonian Journal of Earth Sciences, 2014 Late Pridoli Cruziana traces have recently been found in carbonate shelf sediments of the Ohesaare Formation on Saaremaa Island, Estonia. Cruziana isp. is interpreted here as a locomotory trace (repichnia) of an arthropod, possibly a trilobite.
Olev Vinn
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Preliminary report on the Oldenburg “butter shale” in the Upper Ordovician (Katian; Richmondian) Waynesville Formation, USA [PDF]
Estonian Journal of Earth Sciences, 2015 The Cincinnatian Series (Upper Ordovician; upper Katian) of the Cincinnati Arch region, Ohio, Indiana and Kentucky) contains several bed packages informally referred to as “butter shales” or “trilobite shales”.
Christopher D. Aucoin +3 more
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Early Silurian (Llandovery) Trilobite fauna from [PDF]
Journal of Sciences, Islamic Republic of Iran, 2020 The aim of this study is to analyze the assemblage of trilobites in the Silurian sequences of Iran by exploring stratigraphic section of the Silurian Niur Formation (Asadli section).
Hamed Ameri
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Abnormal trilobites from the Silurian and Devonian of Europe
Acta Palaeontologica PolonicaMalformed trilobites have been documented in deposits ranging from the Cambrian to the Permian. Continued examination of novel malformed specimens provides insight into how trilobites recovered from injuries, experienced genetic abnormalities, and ...
Russell D.C. Bicknell +3 more
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Why did the UV-A-induced photoluminescent blue–green glow in trilobite eyes and exoskeletons not cause problems for trilobites? [PDF]
PeerJ, 2015 The calcitic lenses in the eyes of Palaeozoic trilobites are unique in the animal kingdom, although the use of calcite would have conveyed great advantages for vision in aquatic systems.
Brigitte Schoenemann +2 more
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Sedimentology, EarlyView.ABSTRACT Filamentous, anastomosing spar‐filled networks in Phanerozoic carbonates have been interpreted as the mineralised remains of keratose (non‐spiculate) sponges, yet their recognition remains contested because fabrics of broadly similar appearance may arise from microbial, diagenetic or physical processes. This study combines direct fossil–modern
Jeong‐Hyun Lee +2 more
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Ancestral patterning of tergite formation in a centipede suggests derived mode of trunk segmentation in trilobites. [PDF]
PLoS ONE, 2012 Trilobites have a rich and abundant fossil record, but little is known about the intrinsic mechanisms that orchestrate their body organization. To date, there is disagreement regarding the correspondence, or lack thereof, of the segmental units that ...
Javier Ortega-Hernández, Carlo Brena
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