Carcharodontosauridae

Lore & Background

The earliest possible carcharodontosaurid fossil may date to 1835 with the discovery of Poekilopleuron in Jurassic-aged sediments in Normandy, France, described in 1836 by Jacques Amand Eudes-Deslongchamps. However, the holotype was destroyed during World War II, and its phylogenetic position remains uncertain; it is generally considered a megalosauroid or metriacanthosaurid, and its classification as a basal carcharodontosaurid is highly uncertain and not widely accepted. If not Poekilopleuron, the oldest discovery would be Veterupristisaurus, from the Jurassic Tendaguru Formation of Tanzania, described by Werner Janensch in 1925 as an indeterminate large theropod.

Reader's Guide

Carcharodontosauridae represents a significant clade of large theropod dinosaurs that dominated terrestrial ecosystems during the early and middle Cretaceous, particularly in Gondwana. Along with spinosaurids, they were the largest predators of their time, with species present in North America (Acrocanthosaurus), Europe (Concavenator), and possibly Asia (Shaochilong). Their fossils range from the Barremian to the Turonian, after which they were replaced by abelisaurids in Gondwana and tyrannosaurids in North America and Asia. The family was originally named by Ernst Stromer in 1931 for Carcharodontosaurus saharicus, and later expanded to include Giganotosaurus and others. In 2007, Steve Brusatte and Paul Sereno erected the subfamily Carcharodontosaurinae for the highly-derived giant forms of Africa and South America, with the tribe Giganotosaurini comprising South American species. The oldest known carcharodontosaurid is Veterupristisaurus from the Late Jurassic of Tanzania, described by Oliver Rauhut in 2011. Carcharodontosaurids are characterized by morphological features such as teeth with wrinkled enamel, four premaxillary alveoli, and opisthocoelous cervical vertebrae. Their legacy lies in demonstrating the widespread distribution of giant theropods across Cretaceous continents and their eventual replacement by other predator groups.

Did You Know?

• The name Carcharodontosauridae means 'shark-toothed lizards', referencing the similarity of their teeth to those of the great white shark (Carcharodon carcharias).
• The earliest possible carcharodontosaurid fossil, Poekilopleuron, was discovered in 1835 in Normandy, France, but its holotype was destroyed during World War II.
• The oldest confirmed carcharodontosaurid is Veterupristisaurus from the Late Jurassic (about 154–150 million years ago) of Tanzania.
• The partial skeleton of Carcharodontosaurus described by Ernst Stromer in 1931 was destroyed in World War II and later recognized as a new genus, Tameryraptor markgrafi, in 2025.

Taxonomy and the Shark-Toothed Name

The family name Carcharodontosauridae derives from the Greek carcharodontósauros, meaning "shark-toothed lizards," a nod to the serrated, blade-like dentition that closely mirrors the teeth of the great white shark. Ernst Stromer formalized this grouping in 1931 after examining a partial skeleton that Austro-Hungarian paleontologist Richard Markgraf had unearthed near Ain Gedid, Egypt, in 1914. Stromer recognized that the teeth and skeletal elements were too distinctive to remain within the then-wastebasket taxon Megalosaurus, which had previously been used to label two isolated teeth found in 1924 in Algeria's Continental Intercalaire deposits. Those teeth, originally assigned to Megalosaurus saharicus by French geologists Charles Depéret and Justin Savornin in 1925, were later lost and deemed undiagnostic. Stromer designated the smaller of those two teeth as the lectotype of C. saharicus, making it the formal name-bearing specimen despite its physical absence. In modern paleontology, Carcharodontosauridae designates a clade nested within Carnosauria, anchoring one of the most iconic predator lineages of the Mesozoic.

Fossil Fortunes and Wartime Losses

The fossil record of carcharodontosaurids is marked by both remarkable early finds and catastrophic losses. The earliest potential discovery traces back to 1835, when Poekilopleuron was found in Jurassic-aged sediments in Normandy, France, and described by Jacques Amand Eudes-Deslongchamps in 1836. Tragically, its incomplete postcranial skeleton was destroyed during World War II, leaving its phylogenetic position uncertain; recent analyses place it variously as a basal carcharodontosaurid, a metriacanthosaurid, or a megalosauroid. The next oldest candidate, Veterupristisaurus, was recovered between 1909 and 1913 from Tanzania's Tendaguru Formation but went unrecognized as a carcharodontosaurid until Oliver Rauhut's 2011 reanalysis of its caudal vertebrae. Perhaps most painfully, Stromer's 1931 type skeleton from Egypt was also lost in the war; in 2025 it was re-recognized as a distinct genus, Tameryraptor markgrafi. Meanwhile, the two original Carcharodontosaurus teeth from Algeria have been lost and are considered undiagnostic, yet numerous other specimens from across North Africa have since been referred to the species.

The Gondwanan Renaissance of the 1990s

For decades after Stromer's 1931 description, carcharodontosaurid research progressed slowly, with fossils like Acrocanthosaurus often misassigned to other carnosaurian families or lumped into unrelated genera. The field transformed in the 1990s when renewed interest in Cretaceous Gondwanan fauna unlocked a wave of discoveries. In 1993, a roughly seventy-percent complete skeleton was unearthed in Neuquén, Argentina, and named Giganotosaurus in 1995 by Rodolfo Coria and Leonardo Salgado—though they did not initially recognize its close ties to Carcharodontosaurus and Acrocanthosaurus. That connection was made explicit in 1996 when Paul Sereno and colleagues described an incomplete Carcharodontosaurus skull from Morocco's Kem Kem Beds and formally united these genera into a transcontinental clade. The momentum continued: a menagerie of new genera followed, including Concavenator, Meraxes, and Tyrannotitan, all represented by relatively complete remains. In 2007, Steve Brusatte and Sereno erected the subfamily Carcharodontosaurinae to encompass the highly derived giants of Africa and South America, with the tribe Giganotosaurini grouping the South American members while excluding Carcharodontosaurus itself.

Gigantism and Global Ecological Reach

Carcharodontosaurids occupy a remarkable tier in the Mesozoic food web. Alongside spinosaurids, they dominated as the largest predators across Gondwana during the early and middle Cretaceous, with their range extending into North America through Acrocanthosaurus and into Europe via Concavenator. Several members—Giganotosaurus, Mapusaurus, Carcharodontosaurus, Tyrannotitan, and Acrocanthosaurus—rivaled even Tyrannosaurus and Spinosaurus in overall body size. Current estimates place the maximum weight of the largest carcharodontosaurids at eight to ten metric tons, while even the smallest members of the family weighed at least five hundred kilograms. This extraordinary size range underscores the ecological versatility of the group, spanning from animals comparable in mass to a large land mammal up to creatures approaching ten tonnes. Their confirmed presence on multiple continents—from the Kem Kem beds of Morocco to the Neuquén region of Argentina to sites in North America and Europe—paints a picture of a predator lineage that achieved broad geographic dominance during a critical window of Cretaceous evolution.