Orthoceras, nautiloid

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Orthoceras, nautiloid

Shown here is Orthoceras, a straight Ordovician nautiloid

Mary Evans Picture Library makes available wonderful images created for people to enjoy over the centuries

Media ID 8597653

© Mary Evans Picture Library 2015 - https://copyrighthub.org/s0/hub1/creation/maryevans/MaryEvansPictureID/10703612

Asparagales Cephalopod Cephalopoda Chambered Cone Mollusc Mollusca Mollusk Monocot Monocotyledon Nautilida Nautilidae Nautiloid Nautilus Orchid Orchidaceae Orchids Ordovician Paleozoic Phanerozoic Prehistoric Angiospermae Invertebrata Magnoliophyta Orthoceras

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> Animals > Mollusks > Cephalopods

> Animals > Mollusks > Nautiloids

EDITORS COMMENTS
1. Title: "Orthoceras: A Paleozoic Marvel of the Cephalopod World" Orthoceras, as depicted in this print from the Ordovician era, is a striking example of the diverse and intriguing invertebrates that inhabited our planet millions of years ago. Belonging to the Nautilida order, this straight-shelled nautiloid is a member of the Cephalopoda class, which also includes the modern-day squid, octopus, and the chambered nautilus. The Orthoceras, with its distinctive conical shape and delicate, spiraled sutures, is a testament to the rich diversity of life during the Paleozoic era. Its shell, made primarily of aragonite, served as both a protective housing and a buoyancy control device, allowing the animal to regulate its depth in the water column. The interior of the Orthoceras shell reveals a series of interconnected chambers, each separated by thin partitions called septa. As the animal grew, it added new chambers, leaving the older ones behind, much like the growth rings in a tree trunk. This unique feature is a hallmark of the Nautilida order and sets them apart from other cephalopods. Orthoceras is not to be confused with the Orchidaceae family, which includes the popular flowering plants we know as orchids. While both share the "orchid" name in their taxonomic lineage, they belong to distinct phyla – the Mollusca for Orthoceras and the Magnoliophyta for Orchidaceae. The discovery of well-preserved Orthoceras fossils provides invaluable insights into the life and evolution of these ancient marine creatures. Their elegant shells, with their intricate patterns and spiral designs, continue to fascinate scientists and collectors alike, offering a glimpse into the rich history of our planet's biosphere.

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