No, the Japanese are a modern ethnic group of people from Japan. Ammonites are ancient marine animals that went extinct millions of years ago.
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They were invertebrates. They were shelled molluscs, basically large sea snails.
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.
Ammonites are members of the subclass Ammonoidea. They get their name from Pliny the Elder, a Roman historian, who called the ammonis cornua (meaning "horns of Ammon," referring to the Egyptian god who was often depicted wearing ram's horns).
Squid
Ammonites were able to swim, thanks to the unique construction of their shell, which was divided into a series of air chambers. The air in the chambers provided buoyancy for the animal to float; like modern cephalopods, they probably moved through the water using jet propulsion. Reference site:
Ammonites first appeared during the Devonian Period within the Paleozoic Era.
Ammonites went extinct at the end of the Cretaceous Period.
Ammonites went extinct at the same time as the dinosaurs, about sixty-five million years ago.