Tetragramma donaldtrumpi is a species of fossil sea urchins discovered and identified by William R. Thompson, Jr. in 2016. The specimen locality is from the Lower Cretaceous, Trinity Group, of the Glen Rose Formation near Fischer, Texas, in the United States.
Based from the fossils discovered of Tetragramma donaldtrumpi, the species is known to have been about 1 inch (2.5 cm) in size and round in shape, with the appearance of a Life Savers candy. The genus Tetragramma is known from the Upper Jurassic (Oxfordian) to the Upper Cretaceous (Turonian).
Thompson named the species to honor then Republican presidential nominee Donald Trump. A paleontology lab at the University of Texas at Austin holds a fossil of the species, along with 45 others.
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- Thompson Jr., William R. (November 2016). Fossil Echinoids of Texas: A Monograph of Fossil Sea Urchins. River Stix. ISBN 978-1617042782.
- "Tetragramma donaldtrumpi Thompson, 2016". ZooBank. Retrieved 3 January 2019.
- Wheeler, Christine DeLong (7 November 2016). "New species of fossil sea urchin named after Donald Trump". WMUR. Retrieved 17 February 2017.
- "Tetragramma Agassiz, 1838". The Echinoid Directory. Natural History Museum, London. Retrieved 2017-01-24.
- Mendoza, Madalyn. "With fossil, Donald Trump becomes 'permanent part of the scientific record'". San Antonio Express-News. Retrieved 17 February 2017.
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