Orthoceras, from Ancient Greek ὀρθός (orthós), meaning "straight", and κέρας (kéras), meaning "horn", is a genus of extinct nautiloid cephalopod restricted to Middle Ordovician -aged marine limestones of …

Orthoceras refers to an extinct genus of marine cephalopods, ancient relatives of modern-day squids and octopuses, known for their distinctively straight, conical shells. These creatures lived in Earth’s …

Orthoceras was an ancient cephalopod that lived about 370 million years ago. The name means straight horn, referring to the characteristic long, straight, conical shell.

Orthoceras is part of a larger group of orthocerid cephalopods characterized by their straight shells and simple suture patterns. Paleontologists have identified numerous species within the Orthoceras …

Nov 5, 2025 · Orthoceras is the name given to an extinct genus of marine invertebrate that swam the oceans of an earlier Earth. These creatures left behind a substantial fossil record found across the …

Nov 27, 2023 · Orthoceras is the name given to a genus of extinct marine cephalopods that lived during the Paleozoic Era, particularly in the Ordovician and Silurian periods, approximately 488 to 443 …

Orthoceras fossils offer a portal into the primordial oceans of the Ordovician Period, between 488 and 444 million years ago. During this time, sea levels were exceptionally high, submerging much of the …

Oct 20, 2024 · Orthoceras, meaning “straight horn,” is a genus of extinct cephalopods that lived approximately 400 to 450 million years ago during the Ordovician period. These ancient marine …

Orthoceras, an ancient marine creature that thrived around 400 million years ago, holds a special place in the fossil record. Known for its long, straight shell, this extinct cephalopod offers a fascinating …

Jan 1, 2024 · Discover fascinating facts about Orthoceras, an ancient prehistoric cephalopod with a long, straight shell that lived over 400 million years ago. Learn about its size, habitat, evolutionary …