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Tretaspis

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description Tretaspis Overview

Tretaspis is an extinct genus of trinucleid trilobites from the Ordovician Period. Its broad cephalon carries a distinctive marginal fringe marked by concentric rows of pits, while the eyes are greatly reduced or absent, reflecting the specialized morphology of trinucleid trilobites. Fossils are known from marine shelf deposits in parts of Europe and North Africa.

help Tretaspis FAQ

What is Tretaspis?

Tretaspis is an extinct genus of trinucleid trilobites from the Ordovician Period. Its broad cephalon has a distinctive marginal fringe marked by concentric rows of pits.

Did Tretaspis have eyes?

Tretaspis had greatly reduced eyes or may have lacked functional eyes altogether. This unusual feature is part of the specialized morphology of trinucleid trilobites.

What is the pitted fringe on Tretaspis?

The pitted fringe is a broad margin around the cephalon, or head shield. In Tretaspis it is arranged in concentric rows and is one of the easiest features to recognize in fossils.

When did Tretaspis live?

Tretaspis lived in the Ordovician Period, when it inhabited marine environments. The available description does not support assigning the whole genus to one exact Ordovician stage.

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