Fossil Record 7(1): 69-132, doi: 10.1002/mmng.20040070106
Die Gattung Erratencrinurus Krueger, 1971 (Trilobita; Ordovizium) aus baltoskandischen Geschieben
H.-H. Krueger‡‡ Institut für Paläontologie, Museum für Naturkunde der Humboldt-Universität zu Berlin, Invalidenstraße 43, 10115 Berlin, Germany
© H.-H. Krueger. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Citation:
Krueger H-H (2004) Die Gattung Erratencrinurus Krueger, 1971 (Trilobita; Ordovizium) aus baltoskandischen Geschieben. Fossil Record 7(1): 69-132. https://doi.org/10.1002/mmng.20040070106 |  |
Abstract
Aus der mittel- bis oberordovizischen Trilobitenfamilie Encrinuridae, die in Baltoskandia durch die Untergattungen Erratencrinurus und Celtencrinurus repräsentiert wird, werden achtzehn Arten beschrieben, darunter die vier neuen Arten Erratencrinurus (E.) sellinensis, E. (E.) heinrichi, E. (E.) praecapricornu und E. (E.) rhebergeni. Das überwiegende Material stammt aus dem schwer zu präparierenden Ostseekalk. Die Tripp'sche Tuberkelformel wurde der Erratencrinurus-Gruppe angepasst; innerhalb der Erratencrinurus-Gruppe können drei verschiedene Schilder-Typen des scutum rostrale nachgewiesen werden. Unterschiedliche Tuberkeltypen bis hin zu extremen Stacheln wurden beschrieben. Außerdem kann eine Reduzierung von drei Thoraxialstacheln im Mittelordovizium zu einem im oberen Oberordovizium festgestellt werden. Verschiedene Regionen des Panzers von Erratencrinurus (E.) sellinensis, die Porenkanäle besitzen, werden dargestellt. Ein neuer Häutungstyp kann an Panzerhemden von Erratencrinurus (E.) seebachi beschrieben werden.
In Baltoscandia the Middle to Late Ordovician trilobite family Encrinurida is represented by the two subgenera Erratencrinurus and Celtencrinurus. Out of these 18 species, four new species are described herein. Most of the material comes from the Ostseekalk which is an extremely hard rock and thus difficult to preparate. The tubercle formula after Tripp is applied to the Erratencrinurus group and led to the distinction of three different types of scutum rostrale shields. Various types of tubercles which may even pass into extreme spines are described. The number of thoracic spines becomes reduced from three spines in Middle Ordovician taxa to a single spine in youngest Ordovician species. Different parts of the carapace of Erratencrinurus sellinensis with pore canals are illustrated and a new moulting type of E. seebachi is introduced. New species are E. sellinensis. E. heinrichi, E. praecapricornu and E. (E.) rhebergeni.
doi:10.1002/mmng.20040070106
In Baltoscandia the Middle to Late Ordovician trilobite family Encrinurida is represented by the two subgenera Erratencrinurus and Celtencrinurus. Out of these 18 species, four new species are described herein. Most of the material comes from the Ostseekalk which is an extremely hard rock and thus difficult to preparate. The tubercle formula after Tripp is applied to the Erratencrinurus group and led to the distinction of three different types of scutum rostrale shields. Various types of tubercles which may even pass into extreme spines are described. The number of thoracic spines becomes reduced from three spines in Middle Ordovician taxa to a single spine in youngest Ordovician species. Different parts of the carapace of Erratencrinurus sellinensis with pore canals are illustrated and a new moulting type of E. seebachi is introduced. New species are E. sellinensis. E. heinrichi, E. praecapricornu and E. (E.) rhebergeni.
doi:10.1002/mmng.20040070106