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Calymene blumenbachii

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description Calymene blumenbachii Overview

Calymene blumenbachii is a species of trilobite from Silurian rocks, particularly the Wenlock Limestone around Dudley in the English West Midlands. Its compact, segmented exoskeleton could roll into a defensive ball, and abundant local fossils became popularly known as the Dudley Bug or Dudley Locust. The animal has long served as an emblem of Dudley's geological heritage and appears in the borough's heraldry. It is studied as a characteristic member of the diverse marine fauna that inhabited the region during the Silurian Period.

help Calymene blumenbachii FAQ

Why is Calymene blumenbachii called the Dudley Bug?

The nickname comes from the abundance of its fossils in Silurian limestone around Dudley in England's West Midlands. The trilobite became so closely associated with the town that a fossil appears in Dudley's heraldic imagery.

Could Calymene blumenbachii roll into a ball?

Yes, its articulated exoskeleton allowed it to enroll by bringing the head and tail shields together. This posture protected its softer underside in much the same way that a modern pill bug curls defensively.

How old are Dudley Bug fossils?

They come primarily from the Wenlock Series of the Silurian Period. That places them at roughly 430 million years old, long before dinosaurs or the first forests.

How can Calymene blumenbachii be distinguished from a modern arthropod?

It has the three-lobed body organization characteristic of trilobites, with a raised axial lobe between two pleural lobes. The animal is extinct, and its closest-looking modern counterparts are only superficial analogues rather than living trilobites.

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