Connagnostus eichbaumi

Connagnostus eichbaumi
Temporal occurrence
Central Cambrian
510 to 500 million years
Locations
Northern Germany ( Plön district , Sasel )
Systematics
Trilobites (Trilobita) Agnostida Agnostina Agnostidae Connagnostus Connagnostus eichbaumi
Scientific name
Connagnostus eichbaumi
Rudolph , 1994

Connagnostus eichbaumi is a small trilobite from the Cambrian .

features

Connagnostus eichbaumi has a very wide border around the cephalon with a flat and wide seam furrow. The front part of the glabella (anteroglabella) is narrower than the back part (posteroglabella). The posteroglabella is unsegmented and lacks the tubercle (small elevations on the spindle and glabella) and it is widened like a club at the base towards the thorax with two small, triangular basal lobes on the left and right. The median prelabellar furrow is absent and the free cheeks (librigenae) are smooth. The median prelabellar furrow is the furrow that in some agnostids (e.g. Agnostus pisiformis ) divides the cephalon at the tip.

This species has an oval pygidium . The hem is moderately wide and curved in an S-shape against the short spicula (small spike-shaped extensions) and has a very wide and shallow hem furrow. The clearly domed spindle (axial lobe) is twice as wide on the pygidium as the flanks on the left and right sides. The tubercles are rounded and small.

Connagnostus eichbaumi is similar to the species Peronopsis insignis , which occurs in layers of the same age. The big differences are the widened club-shaped part of the posteroglabella and the wider and more arched spindle on the pygidium.

particularities

The species was named in honor of Kurt Werner Eichbaum (1916–2000) for his services in bed load research .

The fossil is found together with the trilobite species Lejopyge laevigata and Andrarina costata .

Individual evidence

1. ↑ ^{a b c d} Frank Rudolph, Die Trilobiten der Mittelkambrischen Geschiebe , Verlag Frank Rudolph, Wankendorf, 1994, ISBN 3-929671-04-2