Trilobite Montana, USA Lower devonian, 350 million years 9.5 x 6 x 5 cm Provenance: - Siber & Siber - Swiss private collection Dicranurus (Greek, dikranon, a pitchfork, and oura, tail) is a genus of Lower to Middle Devonian odontopleurid trilobites that lived in a shallow sea that lay between Euramerica and Gondwana, corresponding to modern-day Oklahoma and New York. Their bodies averaged about 1 inch (25 mm) in length, though their large spikes made them at least 2 inches (51 mm) in length. It is speculated that such tremendous spikes hampered the ability of predators, such as arthrodire placoderms, to attack them, as well as to help prevent them from sinking into the soft mud of their environment. This specimen presented here is of very fine quality and shows barely any restaurations. See also lot 1802. DICRANURUS ELEGANS Trilobit USA, Oklahoma Unteres Devon, um 380 Millionen Jahre Provenienz: - Siber & Siber Zürich - Schweizer Privatsammlung Dicranurus (griechisch dikranon, Heugabel, und oura, Schwanz) ist eine Gattung unter- bis mitteldevonischer odontopleurider Trilobiten, die im damals flachen Meer zwischen Euramerika und Gondwana lebten, das dem heutigen Oklahoma und New York bzw. Marokko entspricht. Ihre K?rper waren im Durchschnitt etwa 25 mm lang, mit ihren gro?en Stacheln erreichten sie Maximall?ngen von 55 mm. Es wird vermutet, dass diese gewaltigen Stacheln zur Abwehr von Raubtieren, wie z. B. Gliederfü?ern, dienten und au?erdem dazu beitrugen, dass sie nicht in den weichen Schlamm auf dem Meeresgrund einsanken. Das hier pr?sentierte Exemplar ist von sehr guter Qualit?t und weist kaum Restaurierungen auf. Siehe auch Lot 1802notes:*
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