Tetragramma is a genus of fossil sea urchins known from the Upper Jurassic (Oxfordian) to the Upper Cretaceous (Turonian).[1]

Tetragramma
Temporal range: Oxfordian–Turonian
Scientific classification
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Genus:
Tetragramma

Type species
Tetragramma variolare
(Brongniart, 1822)
Synonyms
  • Acanthechinopsis Gregory, 1906

Species

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Species include:[2]

References

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  1. ^ "Tetragramma Agassiz, 1838". The Echinoid Directory. Natural History Museum, London. Retrieved 2017-01-22.
  2. ^ Kroh, A. (2010). Tetragramma L. Agassiz, 1838 †. In: Kroh, A. & Mooi, R. (2015) World Echinoidea Database. Accessed at http://www.marinespecies.org/Echinoidea/aphia.php?p=taxdetails&id=512465 on 2017-01-22
  3. ^ a b c Vaziri, M. R.; Arab, A. L. (2013). "Echinoids of the genus Tetragramma Agassiz (Phymosomatoida) from the Aptian sediments of the Basab region, northwest of Kerman, Iran". Journal of Sciences, Islamic Republic of Iran. 24 (2): 149–155.
  4. ^ Thompson, William R. (2016). Fossil Echinoids of Texas: A Monograph of Fossil Sea Urchins. River Stix. ISBN 978-1617042782.