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Orthoceras regulare

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description Orthoceras regulare Overview

Orthoceras regulare is an extinct, straight-shelled nautiloid cephalopod and the type species of the genus Orthoceras. It is known from Middle Ordovician limestone deposits in parts of the Baltic and eastern European region, including Sweden and areas around the eastern Baltic. The species is distinct from many Silurian and Devonian orthocerid fossils that are sold commercially under the broader name “orthoceras.”

help Orthoceras regulare FAQ

What is Orthoceras regulare?

Orthoceras regulare is an extinct, straight-shelled nautiloid cephalopod and the type species of the genus Orthoceras. It is known from Middle Ordovician limestone deposits in parts of the Baltic and eastern European region.

When did Orthoceras regulare live?

It lived during the Middle Ordovician, long before dinosaurs appeared. Fossils are associated with limestone deposits in areas including Sweden and the eastern Baltic region.

Was Orthoceras regulare a modern squid or nautilus?

It was an extinct nautiloid cephalopod, related in broad evolutionary terms to living nautiluses but not a modern squid. Its shell was straight rather than coiled like the shell of today's chambered nautilus.

Why is Orthoceras regulare important in classification?

It is the type species of Orthoceras, meaning it anchors the formal definition of that genus. The species is recognized for its straight shell and Middle Ordovician fossil record.

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