Tetragramma
Tetragramma is a genus of fossil sea urchins known from the Upper Jurassic to the Upper Cretaceous.
Species include:Tetragramma antsingyensis Lambert, 1936Tetragramma basabensis Vaziri & Arab, 2013Tetragramma besairiei Lambert, 1933Tetragramma bosei Jones, 1938Tetragramma cornueli Corroy, 1925Tetragramma depressum Vaziri & Arab, 2013Tetragramma donaldtrumpi Thompson, 2016Tetragramma giganteum Lambert, 1935Tetragramma hourcqi Collignon, 1950Tetragramma pomeraniae Kongiel, 1957Tetragramma tafermense Lambert, 1931Tetragramma tetratuberculatus Vaziri & Arab, 2013