Siamamia (meaning "Siam Amia") is an extinct genus of ray-finned fish in the family Amiidae.Deesri, U.; Naksri, W.; Jintasakul, P.; Noda, Y.; Yukawa, H.; Hossny, T.E.; Cavin, L. A New Sinamiin Fish (Actinopterygii) from the Early Cretaceous of Thailand: Implications on the Evolutionary History of the Amiid Lineage. Diversity 2023, 15, 491. https://doi.org/10.3390/d15040491 They are halecomorph fishes endemic to Early Cretaceous freshwater environments from north-eastern Thailand.
Siamamia fossils have been found in the Early Cretaceous Sao Khua Formation, present-day in Phu Phok, Sakhon Nakhon Province, Thailand.
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