Distinctions between Physogaleus and Galeocerdo are difficult with extinct sharks from the Oilgocene/Miocene as there is little paleobiological information allowing for hard conclusions.

Referred to in this article as P. alabamensis, fossils have been recovered in the Southern United States, specifically in Alabama, Arkansas, and Louisiana.

[3] Identification and habits of P. alabamensis are often confused with taxonomically similar sharks existing in the same period because information about them is sparse and mostly limited to tooth fossils.

[6] P. contortus and G. aduncas experienced sympatric distributions around the East Coast of the United States during the Miocene, nearly identical to P.

[4] G. cuvier, the modern tiger shark, has larger, more robust teeth than P. alabamensis and its sister species.

[3] As the tiger shark lineage evolved, tooth size increased greatly, indicating consumption of larger prey and possibly more aggressive feeding tactics.

G. cuvier has ovoviviparous reproductive strategies, giving birth to live young[8] and producing anywhere from 3 to 57 offspring and caring attentively for 15 to 16 months.