a size
ammonites are extinct
Ammonites are named for the Egyptian god Ammon, who had a ram's head. The shells of ammonites are spirals like the horns of a ram.
Various aquatic reptiles were predators of ammonites. Fossils of damaged ammonites have been found with teeth marks from Plesiosaurs.
Squid
Ammonites may grow over 2 metres. The giant clammay grow up towards 1.5 metres. Both of these are roughly circular in shape. Nautiloids of a linear shape (actually a long thin cone) were up to 3.5 metres in length.But I expect that if these were coiled as the Ammonites were, they would not have a greater overall diameter.
Ammonites first appeared during the Devonian Period within the Paleozoic Era.
Ammonites went extinct at the end of the Cretaceous Period.
Fish grow with age. Some only grow to the size of the tank while others grow to a maximum size no mater the size of their environment.
Ammonites went extinct at the same time as the dinosaurs, about sixty-five million years ago.
Ammonites are very common fossils from the Jurassic Period. They were dominant in the ocean during and before the Jurassic Period.
Ammonites are the most widely-known and abundant fossils in the world. The name "ammonites" came from the Greek god Ammon. Ammonites include squid, octopus, snails, cuttlefish, and nautilus.
ammonites