Tomagnostus sibiricus Pokrovskaya & Egorova, 1972 (Trilobita) from the Middle Cambrian Exsulans Limestone of Scania, Sweden

TY - JOUR

T1 - Tomagnostus sibiricus Pokrovskaya & Egorova, 1972 (Trilobita) from the Middle Cambrian Exsulans Limestone of Scania, Sweden

AU - Weidner, Thomas

AU - Nielsen, Arne Thorshøj

PY - 2015/1/2

Y1 - 2015/1/2

N2 - Species assigned to the Middle Cambrian agnostid genus Tomagnostus are briefly reviewed and a large number of Tomagnostus sibiricus found in Scania, Sweden, are described. The material derives from the Triplagnostus gibbus Zone in the Exsulans Limestone. Several morphological features support an assignment of the species to Tomagnostus: occasional scrobiculation of the cephalon, half of the cephala have an incipient frontal sulcus, pygidia have well-developed F2 furrows, well-defined transverse depression on posteroaxis and occasionally minute marginal spines or swellings. One pygidium of the biostratigraphically important Pentagnostus praecurrens and one pygidium of the rare Onymagnostus seminula are also described from the Exsulans Limestone of Brantevik, Scania. The new findings expand the stratigraphic ranges of these species in Scandinavia.

AB - Species assigned to the Middle Cambrian agnostid genus Tomagnostus are briefly reviewed and a large number of Tomagnostus sibiricus found in Scania, Sweden, are described. The material derives from the Triplagnostus gibbus Zone in the Exsulans Limestone. Several morphological features support an assignment of the species to Tomagnostus: occasional scrobiculation of the cephalon, half of the cephala have an incipient frontal sulcus, pygidia have well-developed F2 furrows, well-defined transverse depression on posteroaxis and occasionally minute marginal spines or swellings. One pygidium of the biostratigraphically important Pentagnostus praecurrens and one pygidium of the rare Onymagnostus seminula are also described from the Exsulans Limestone of Brantevik, Scania. The new findings expand the stratigraphic ranges of these species in Scandinavia.

U2 - 10.1080/11035897.2014.966253

DO - 10.1080/11035897.2014.966253

M3 - Journal article

SN - 1103-5897

VL - 137

SP - 9

EP - 19

JO - GFF

JF - GFF

IS - 1

ER -