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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Permian trilobites and the applicability of the “living fossil” concept to extinct clades
Frontiers in Ecology and Evolution, 2023 Some taxa occupy our imaginations as “living fossils” because they were known from the fossil record before being discovered alive today. Other taxa are considered “living fossils” because modern relatives bear a strong morphological resemblance to ...
Melanie J. Hopkins +3 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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Humble origins for a successful strategy: complete enrolment in early Cambrian olenellid trilobites [PDF]
, 2013 Trilobites are typified by the behavioural and morphological ability to enrol their bodies, most probably as a defence mechanism against adverse environmental conditions or predators.
Butterfield, Nicholas J. +4 more
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Teratological trilobites from the Silurian (Wenlock and Ludlow) of Australia [PDF]
, 2021 Documentation of malformed trilobites has presented invaluable insight into the palaeobiology of a wholly extinct euarthropod group. Although the northern hemisphere record is relatively well documented, examples of abnormal trilobites from Australia are
Bicknell, Russell D C, Smith, Patrick M
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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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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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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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Los trilobites y el Paleozoico temprano [PDF]
, 2020 Una visita a la historia de los trilobites, extinguidos pobladores de los mares paleozoicos cuyo estudio arroja luz sobre una amplia gama de cuestiones investigadas por geólogos y paleontólogos.Fil: Tortello, Marcelo Franco.
Tortello, Marcelo Franco +1 more
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Moulting in phacopid trilobites [PDF]
, 1985 Phacopid trilobites, unlike most trilobites, lack functionally articulated libregenae. This distinction presumably dictated ecdysial strategies which were fundamentally different from those forms with sutured cephala.
Stephen E. Speyer
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