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An Atlas of Malformed Trilobites from North American Repositories Part 1. The Indiana University Paleontological Collection

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An Atlas of Malformed Trilobites from North American Repositories Part 1. The Indiana University Paleontological Collection

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Reappraising the early evidence of durophagy and drilling predation in the fossil record: implications for escalation and the Cambrian Explosion
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CitationsShowing 2 of 2 papers
  • Research Article
  • 10.1206/4035.1
An Atlas of Malformed Trilobites from North American Repositories Part 3: The Field Museum of Natural History
  • May 30, 2025
  • American Museum Novitates
  • Russell D.C Bicknell + 2 more

An Atlas of Malformed Trilobites from North American Repositories Part 3: The Field Museum of Natural History

  • Research Article
  • Cite Count Icon 1
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Abnormal trilobites from the Silurian and Devonian of Europe
  • Apr 22, 2025
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  • Russell Bicknell + 3 more

Malformed 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 adapted to pathological conditions. This study focuses on trilobites from the Silurian and Devonian of Europe, presenting new records of: (i) a moulting-related injury in Lioharpes venulosus; (ii) genetic malformations in Calymene blumenbachii and Treveropyge sp.; and (iii) a moulting injury or genetic anomaly in Scutellum (Scutellum) pardalios. Additionally, we record evidence of bryozoan growth on a C. blumenbachii specimen. Our findings provide important data for contextualizing the paleobiology of early and middle Paleozoic trilobites, especially related to responses to ecological pressures.

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Fossil molluscs from the Middle Miocene of Öhningen, southwestern Germany
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Herein, we revise an extensive set of mollusc fossils from the Upper Freshwater Molasse deposits of Öhningen palaeolake (SW Germany; Middle Miocene, MN7). Based on material housed in paleontological collections in Europe and North America, we present the first thorough systematic account of the phylum from this historic locality. A total of ten species were identified from Öhningen: three freshwater gastropods (Lymnaea dilatata Noulet, 1854, Gyraulus cf. applanatus (Thomä), Planorbarius mantelli (Dunker)), two terrestrial gastropods (Granaria cf. schuebleri (Klein), Palaeotachea sylvestrina (Schlotheim)), and five bivalves (Anodonta splendens Goldfuss, A. lavateri (Münster), Pseudunio flabellatus (Goldfuss), “Dreissena” sp., Pisidium escheri (Mayer-Eymar, 1865)). Three freshwater and five terrestrial gastropod genera mentioned in older literature could not be found in the available material. Ours is the first report of a Dreissenidae from Öhningen.

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