Carcharhinus

Lore & Background

Fossil teeth suggest that a majority of extant species in Carcharhinus had already evolved by the Early Miocene, and these species start appearing in the fossil record from that time. Fossil Carcharhinus teeth tend to be highly species-specific in morphology, but are highly variable both within and among species, and even within the jaw, thus requiring careful study to assign to their respective species. The following species are placed in this genus, with a type species noted. In addition, Eschmeyer's Catalog of Fishes recognizes two species of uncertain validity: Carcharhinus acarenatus, native to the western Mediterranean Sea and eastern Atlantic around the coast of the Iberian Peninsula south to Morocco, often treated as synonymous with the copper shark; and Carcharhinus japonicus, native to the northwestern Pacific Ocean, often treated as synonymous with the sandbar shark.

Reader's Guide

Carcharhinus is significant as the type genus of the family Carcharhinidae, one of 10 genera in that family, and it contains over half of the species therein. The genus comprises 36–38 extant and eight extinct species, with likely more yet to be described. Its fossil record, primarily from teeth, indicates that most extant species had evolved by the Early Miocene. The teeth are highly species-specific in morphology but also highly variable, complicating species assignment. The genus includes two species of uncertain validity recognized by Eschmeyer's Catalog of Fishes: Carcharhinus acarenatus, often considered synonymous with the copper shark, and Carcharhinus japonicus, often considered synonymous with the sandbar shark. These uncertainties highlight ongoing taxonomic challenges within the genus.

Did You Know?

• It contains over half of the species in its family.
• Fossil teeth suggest most extant species evolved by the Early Miocene.
• Two species in the genus are of uncertain validity according to Eschmeyer's Catalog of Fishes.