https://www.sandjmandarins.com/difference-between-orange-mandarin-clementine-tangerine-satsuma
“Mandarins are a type of orange and the overarching category that Tangerines, Clementines, and Satsumas fall into. They are generally smaller and sweeter than oranges, a little flatter in shape, and they and have a thinner, looser skin that makes them easier to peel.”