Paleontological and Paleobotanical Museum (Nostimo) teeth of a shark that was 20–25 m long, and a Late Pliocene (3.5 million years old) tooth of an "Anancus arvenensis", a mastodon, an ancient relative of the elephant, which has been recognised here for the first time in the wider area of Western Macedonia. The mastodon which lived in this area was about the same size as a modern elephant, but with longer tusks. Also displayed are some Neolithic tools (from the 4th millennium BC): a fishing weight, and a blade for harvesting crops. Paleontological and Paleobotanical Museum (Nostimo) The Paleontological and Paleobotanical Museum () at Nostimo is
Mastodon incognitum "mastodon". The name "mastodon" (or "mastodont") means "breast tooth" (Ancient Greek: μαστός "breast" and ὀδούς, "tooth"), and was assigned by the French naturalist Georges Cuvier in 1817, for the nipple-like projections on the crowns of its molars. "Mastodon" as a genus name is obsolete; the valid name is "Mammut", a name that preceded Cuvier's description, making "Mastodon" a junior synonym. The change was met with resistance, and authors sometimes applied ""Mastodon"" as an informal name; consequently it became the common term for members of the genus. Species include: Since a tentative 1977 report of "M. matthewi" in China, there