ZusammenfassungAus der mittel-bis oberordovizischen Trilobitenfamilie Encrinuridae, die in Baltoskandia durch die Untergattungen Erratencrinurus und Celtencrinurus reprasentiert wird, werden achtzehn Arten beschrieben, darunter die vier neuen Arten Erratencri-
AbstractIn 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.
ZusammenfassungAus mittel-bis oberordovizischen Geschieben werden funf Taxa der kleinwuchsigen Trilobitengattung Atractocybeloides vorgestellt, davon die beiden neuen Arten Atractocybeloides nebeni n. SP. und Atractocybeloides oepiki n. sp. Die Gattung wurde 1991 an Fragmenten aufgestellt. Sie hat sich in der Aseri-Stufe aus Cybele entwickelt. Neue Funde und das reichhaltige Material aus der Sammlung Rhebergen, in der auch fast vollstandige Panzerhemden von A . berneri enthalten sind, ermoglichten eine Rekonstruktion. ,Weiterhin wird die aus Nonvegen beschriebene Art Atractopyge gracilis der Gattung Atractocybeloides zugeordnet. GroBe Ahnlichkeiten bestehen zur ungefahr gleichaltrigen nordamerikanischen kleinwiichsigen Gattung Cybeloides.Schliisselworter: Trilobita, Atractocybeloides, Geschiebe, Ordovizium.
AbstractFive taxa of the small trilobite genus Atractocybeloides are presented from Middle to Late Ordovician erratic boulders, including the new species Atractocybeloides nebeni n. sp. and Atractocybeloides oepiki n. sp. The genus was errected in 1991 on the basis of fragmentary material. It evolved from Cybele during Aseri-zone times. A reconstruction is made possible due to new finds and the rich material from the Rhebergen collection, including nearly complete cuticles of A. berneri. Furthermore, Atructopyge gracilis from Norway is assigned to Atractocybeloides. Strong similarities exist to the roughly coeval, small trilobite genus Cybeloides, which is known from North America.
ZusammenfassungAus mittel-bis oberordovizischen Geschieben werden funf Taxa der kleinwuchsigen Trilobitengattung Atractocybeloides vorgestellt, davon die beiden neuen Arten Atractocybeloides nebeni n. SP. und Atractocybeloides oepiki n. sp. Die Gattung wurde 1991 an Fragmenten aufgestellt. Sie hat sich in der Aseri-Stufe aus Cybele entwickelt. Neue Funde und das reichhaltige Material aus der Sammlung Rhebergen, in der auch fast vollstandige Panzerhemden von A . berneri enthalten sind, ermoglichten eine Rekonstruktion. ,Weiterhin wird die aus Nonvegen beschriebene Art Atractopyge gracilis der Gattung Atractocybeloides zugeordnet. GroBe Ahnlichkeiten bestehen zur ungefahr gleichaltrigen nordamerikanischen kleinwiichsigen Gattung Cybeloides.Schliisselworter: Trilobita, Atractocybeloides, Geschiebe, Ordovizium.
AbstractFive taxa of the small trilobite genus Atractocybeloides are presented from Middle to Late Ordovician erratic boulders, including the new species Atractocybeloides nebeni n. sp. and Atractocybeloides oepiki n. sp. The genus was errected in 1991 on the basis of fragmentary material. It evolved from Cybele during Aseri-zone times. A reconstruction is made possible due to new finds and the rich material from the Rhebergen collection, including nearly complete cuticles of A. berneri. Furthermore, Atructopyge gracilis from Norway is assigned to Atractocybeloides. Strong similarities exist to the roughly coeval, small trilobite genus Cybeloides, which is known from North America.
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