Description
Ammonite Trilacinoceras Hunanense – An unusual, partly curled ammonite measuring 148 mm (6in). Ordovician. Hunan, China
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family Nautilidae). Over 10,000 species of ammonites have been discovered, showcasing a wide range of sizes and shell shapes
Trilacinoceras hunanense was an ocean animal that lived more than 400 million years ago, during the Late Ordovician period. It was part of a group called nautiloids, which are ancient relatives of today’s squids and octopuses. This creature had a long, straight shell with chambers inside that helped it float in the water. It likely moved by pushing water out of its body, similar to how squids move today.
Fossils of Trilacinoceras hunanense were found in Hunan, China, which is where its name comes from. It probably lived in shallow ocean water and used its tentacles to catch small animals for food. Scientists study this fossil to better understand life in ancient seas and how early ocean animals lived and evolved.
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