Carcharodontosaurus

Carcharodontosaurus saharicus inhabited northern Africa during the Cenomanian, approximately 99 to 94 million years ago. The paleoenvironment was dominated by coastal mangroves, large river deltas, and tidal flats near the Tethys Sea. The climate was hot and humid with monsoon seasonality. The ecosystem was unusual for harboring an exceptionally high proportion of large carnivores: besides C. saharicus, there were Spinosaurus aegyptiacus, a yet-unnamed abelisaurid, and Deltadromeus agilis.

C. saharicus was an active predator of large terrestrial vertebrates, especially sauropods. Its highly serrated blade-like teeth, with 18 to 20 serrations per centimeter, were ideal for slicing flesh rather than crushing bone, differing fundamentally from T. rex. Estimated anterior bite force was 11,312 N, significantly lower than T. rex (48,505 N). Henderson's (2015) analysis showed that a pair of adults could lift up to 850 kg. Isotopes indicate preference for terrestrial prey over fish.

The behavioral fossil record for C. saharicus is scarce. Bite marks on large African theropod skulls suggest predators of this size occasionally fought over territory or carcasses, behavior depicted in the documentary Planet Dinosaur (2011). Binocular vision was limited due to the elongated snout, indicating hunting likely relied more on keen olfaction and ambush than active pursuit. There is no fossil evidence of social or reproductive behavior in the species.

Carcharodontosaurus saharicus did not belong to Coelurosauria, the group including feathered dinosaurs such as birds, raptors, and tyrannosaurs. Therefore, the presence of feathers is unlikely, and the integument was probably scaly, similar to other large allosauroids. Bone histology from related carcharodontosaurids (such as Meraxes gigas) indicates rapid juvenile growth with highly vascularized fibrolamellar bone, suggesting a metabolism higher than ectothermic reptiles. Skeletal maturity was reached after approximately 20 to 30 years.

The founding paper establishing the taxon. French paleontologists Charles Deperet and Justin Savornin describe two giant theropod teeth collected near Timimoun, Algeria, naming them Megalosaurus saharicus. The material consisted only of isolated teeth, now lost. Nevertheless, the species name saharicus was preserved when Ernst Stromer recognized these teeth corresponded to the large theropod he would study in 1931 from Egyptian material. This paper represents the first scientific record of the animal that would later become one of the largest known predators in the history of life on Earth.

Fossilized tooth of Carcharodontosaurus saharicus from Morocco, approximately 6 cm long. Similar teeth were the first records of the animal, described by Deperet and Savornin in 1925.

Carcharodontosaurus saharicus tooth found in the Sahara Desert, shown with a US quarter for scale. The serrated teeth of this species inspired its name.

Fundamental paper in which Ernst Stromer formally establishes the genus Carcharodontosaurus from partial skeletal material from the Bahariya Formation of Egypt. Stromer recognizes that the new specimen's teeth perfectly match those described by Deperet and Savornin in 1925, preserving the epithet saharicus. The material included teeth, vertebrae, and limb bones. This specimen was destroyed when Allied bombing struck the Munich Museum during World War II in 1944, making the 1996 redescription by Sereno and colleagues essential for science.

Right maxilla of Carcharodontosaurus saharicus, one of the most informative cranial elements. Stromer described similar material from Egypt in 1931.

Dental fragment of Carcharodontosaurus saharicus from the Kem Kem Beds of Morocco. Such material allowed Stromer to recognize the genus in 1931.

Historic paper in which Paul Sereno and colleagues describe the nearly complete skull SGM-Din 1, found in Morocco's Kem Kem Beds in 1995. This discovery resolved a half-century mystery: Stromer's original material had been destroyed during World War II. The 1.6-meter skull confirmed Carcharodontosaurus rivaled T. rex in size and established detailed morphological diagnostics, including the expanded antorbita comprising over 30% of skull length. The paper also described Deltadromeus agilis and discussed Late Cretaceous faunal differentiation in Africa.

Reconstruction of the cranium of Carcharodontosaurus saharicus in left lateral view, by Carol Abraczinskas. Published by Ibrahim et al. (2020) and based on neotype SGM-Din 1 described by Sereno et al. (1996).

Skull diagram of Carcharodontosaurus saharicus based on Sereno et al. (1996) and other references. Shows the expanded antorbita, a diagnostic feature of the genus.

Brusatte and Sereno describe a second species of the genus: Carcharodontosaurus iguidensis from Niger. The paper formally revises the genus, compares cranial anatomy between both species, and proposes SGM-Din 1 as the neotype of C. saharicus, replacing Stromer's lost original material. The analysis demonstrates that the two species differ in frontal and nasal features, suggesting that shallow marine barriers in northern Africa during the Cenomanian may have isolated populations and promoted speciation. This work solidified the taxonomic position of C. saharicus and defined the anatomical criteria distinguishing the two species.

Skull reconstruction of Carcharodontosaurus saharicus showing known material (white) and reconstructed parts (gray) based on related taxa. Created by Eotyrannu5 based on sources including Brusatte and Sereno (2007).

Jugal bones of Carcharodontosaurus saharicus, elements that provided comparative data for Brusatte and Sereno's (2007) genus revision.

Comprehensive phylogenetic analysis of Allosauroidea using 157 characters across 20 taxa. The study recovers Carcharodontosauridae as a well-supported monophyletic group including Carcharodontosaurus saharicus, Giganotosaurus carolinii, and Mapusaurus roseae. The analysis places Sinraptor as a basal allosauroid, Neovenator as a basal carcharodontosaurid member, and Acrocanthosaurus as a more derived member. This paper is the standard phylogenetic reference for understanding C. saharicus's relationships among large Cretaceous predators, demonstrating its derived position within South American and African carcharodontosaurids.

Skeletal reconstruction of Carcharodontosaurus saharicus by Marco Auditore, published by Ibrahim et al. (2020). Shows the animal's posture and body proportions, relevant for morphological phylogenetic analyses.

Carcharodontosaurus saharicus skull on display. Skull size and morphology are central characters in allosauroid phylogenetic analyses.

Eddy and Clarke re-examine the well-preserved skull of Acrocanthosaurus atokensis (NCSM 14345), identifying 24 new morphological characters. The resulting phylogenetic analysis includes Carcharodontosaurus saharicus as a central comparative taxon and recovers a topology placing Acrocanthosaurus firmly within Carcharodontosauridae. The paper demonstrates that shared cranial anatomy between C. saharicus and Acrocanthosaurus indicates a more derived phylogeny than previous studies suggested, contributing to understanding of internal carcharodontosaurid relationships and the evolution of large Cretaceous predators in North Africa and North America.

Braincase of Carcharodontosaurus saharicus. Braincase anatomy is one of the characters used in phylogenetic analyses such as Eddy and Clarke (2011).

Size scale diagram of Acrocanthosaurus atokensis with human silhouette for reference, based on Hartman and Paul. Acrocanthosaurus is the central taxon of Eddy and Clarke (2011), whose cranial anatomy analysis sheds light on the phylogenetic relationships of Carcharodontosauridae.

Carrano, Benson, and Sampson present the most comprehensive Tetanurae phylogenetic analysis at that time, with 364 characters and 83 terminal taxa. The study firmly positions Carcharodontosauridae within Allosauroidea and makes an important taxonomic observation for C. saharicus: isolated theropod teeth from northern Africa cannot be confidently assigned to this species since other carcharodontosaurids were present in the same region and time period. This establishes a criterion of taxonomic caution that influenced all subsequent fragmentary material attributions.

Nasal and lacrimal bone of Carcharodontosaurus saharicus. These elements are part of the cranial characters used in Tetanurae phylogenetic analyses.

Dentary fragments of Carcharodontosaurus saharicus. Carrano et al. (2012) stressed caution when attributing isolated teeth to this species.

Henderson uses three-dimensional digital models of Carcharodontosaurus saharicus to analyze its prey-lifting capacity. The study finds that a single adult could sustain approximately 424 kg in its jaws without losing balance, and two adults together could lift up to 850 kg. Using a subadult sauropod (Limaysaurus tessonei) as a prey model, the author demonstrates C. saharicus could lift and carry animals up to 8.3 meters long. This study provides concrete quantitative data on C. saharicus feeding ecology, distinguishing it from bone-crushing theropods like T. rex, whose bite forces were considerably greater.

Carcharodontosaurus saharicus tooth next to a Megalodon tooth, with a US quarter for scale. The serrated teeth were ideal for cutting flesh rather than crushing bone.

Size comparison between Carcharodontosaurus saharicus and a human. The animal reached up to 12.5 meters in length and weighed approximately 6 metric tons.

Sakamoto develops a Bayesian phylogenetic framework to estimate bite force in extinct archosaurs from skull measurements and evolutionary relationships. For Carcharodontosaurus saharicus, the model predicts anterior bite force of 11,312 N and posterior bite force of 25,449 N. These values are significantly lower than T. rex (48,505 N), confirming C. saharicus was not a bone-crusher. The analysis reinforces the hypothesis that different large theropods exploited distinct feeding niches: while T. rex processed whole carcasses, C. saharicus specialized in slicing flesh from live or dead sauropods using sharp blade-like teeth.

Carcharodontosaurus saharicus skull on display. Braincase morphology and zygomatic arches are central to phylogenetic bite force estimation.

Carcharodontosaurus saharicus skull showing the characteristic serrated teeth. The bite force estimated by Sakamoto (2022) is consistent with a slicing rather than bone-crushing specialization.

A 216-page monograph by Ibrahim, Sereno, and colleagues on the Kem Kem Group of Morocco, the geological context, and the Cenomanian African fauna. The work details the paleoenvironment dominated by coastal mangroves, large rivers, and tidal flats near the Tethys Sea. Carcharodontosaurus saharicus is documented as one of four large non-avian theropods in the ecosystem, alongside Spinosaurus, an abelisaurid, and Deltadromeus. The monograph consolidates the stratigraphic and taxonomic record and provides essential data on C. saharicus biogeography in northern Africa during the Cenomanian.

Brain endocasts of Carcharodontosaurus saharicus in multiple views, published by Ibrahim et al. (2020). The endocasts reveal details of the animal's neuroanatomy.

Dental material of Carcharodontosaurus saharicus from the Kem Kem Beds of Morocco, Gara es Sbaa. Ibrahim et al. (2020) extensively documented the fossil record of this species in the formation.

Kellermann, Cuesta, and Rauhut reexamine Stromer's original 1931 Egyptian Carcharodontosaurus material using historical documentation and photographs of the WWII-destroyed specimens. The analysis identifies numerous anatomical differences from the Moroccan neotype SGM-Din 1, including distinct nasal horn features and antorbital fossa characteristics. Based on these differences, the authors propose a new genus Tameryraptor markgrafi for the Egyptian material. This paper has direct implications for C. saharicus: the Moroccan neotype remains the valid species representative, but the historical Egyptian material no longer belongs to the same genus.

Carcharodontosaurus saharicus skull on display at the Royal Ontario Museum. Moroccan material such as this represents the neotype SGM-Din 1 recognized by Kellermann et al. (2025).

Frontal view of Carcharodontosaurus saharicus skull. Anatomical differences between Moroccan and Egyptian material were central to the Tameryraptor proposal by Kellermann et al. (2025).

Larsson uses CT scan data of skull SGM-Din 1 to obtain a complete endocast of Carcharodontosaurus saharicus, revealing unprecedented neuroanatomical details for the animal. The study describes semicircular canal geometry, olfactory lobes, and overall brain shape, which was relatively small and elongated compared to coelurosaurs. Implications for theropod brain evolution indicate C. saharicus had a well-developed sense of smell but limited binocular vision due to the elongated snout. This work was among the first to apply digital neuroimaging to large carnivorous theropods.

Artistic reconstruction of Carcharodontosaurus saharicus by Nobu Tamura. Representations like this reflect the general morphology inferred by Larsson (2001) from endocast analysis.

Complete Carcharodontosaurus saharicus skull on display. Larsson's (2001) CT analysis provided data on pneumatic sinuses and semicircular canals not visible externally.

Rauhut reevaluates Carcharodontosaurus and Bahariasaurus material from the Bahariya Formation of Egypt, working from photographs and descriptions of the war-destroyed material. The study analyzes the validity of both taxa and their distinguishing features, providing a crucial taxonomic foundation before the discovery of skull SGM-Din 1. This intermediate work was important for keeping the taxon C. saharicus in the literature while no substantial cranial material was available, and provided the context for Sereno et al. (1996) to correctly position the new Moroccan specimen.

Dental material of Carcharodontosaurus saharicus from the Kem Kem Beds of Morocco. Rauhut (1995) worked with similar material to reevaluate the taxon before the neotype skull discovery.

Modern reconstruction of Carcharodontosaurus saharicus. The contrast with the speculative reconstructions of the pre-Sereno era highlights the importance of Rauhut's (1995) pioneering taxonomic work.

Novas and colleagues describe Tyrannotitan chubutensis from Patagonia and analyze carcharodontosaurid evolution, using Carcharodontosaurus saharicus as a central comparative taxon. The study demonstrates that African and South American giant predators share a common origin, likely derived from dispersal of Gondwanan ancestors before complete continental separation. This biogeographic analysis is fundamental for understanding why C. saharicus and Giganotosaurus carolinii are morphologically similar despite being separated by thousands of kilometers, and how carcharodontosaurids became dominant superpredators of the Cretaceous on multiple continents.

Carcharodontosaurus saharicus fossil at the Museo di Storia Naturale di Venezia. Biogeographic comparison between African material like this and South American specimens was central to Novas et al. (2005).

Carcharodontosaurus saharicus reconstruction at the Ultimate Dinosaurs exhibition. The animal's morphology reflects the shared Gondwanan origin with South American carcharodontosaurids.

Hassler and colleagues measure calcium isotopes in the tooth enamel of Cretaceous predatory theropods from Morocco's Kem Kem Beds and Gadoufaoua, Niger. Results show that carcharodontosaurids (including C. saharicus) and abelisaurids consumed predominantly terrestrial prey, while spinosaurids such as Spinosaurus were primarily piscivorous. This study resolves a fundamental question about how so many large predators could coexist in the same African ecosystem: they partitioned food resources by exploiting different trophic levels, with C. saharicus at the top of the terrestrial food chain and Spinosaurus dominating the aquatic environment.

Bone fragment of Carcharodontosaurus saharicus from the Kem Kem Beds of Morocco. Material from the Kem Kem Beds was central to Hassler et al.'s (2018) calcium isotope study, which revealed the species' predominantly terrestrial diet.

Carcharodontosaurus saharicus skull at the Museum d'Histoire Naturelle de Gaillac, France. Teeth from specimens like this were the primary source of calcium isotope data in Hassler et al.'s (2018) study.

Full-size T-rex animatronic from the Jurassic Park franchise, with the iconic red Jeep — Amaury Laporte · CC BY 2.0