Acrocanthosaurus and Uberabasuchus

Walter Colvin

Showlow, United States

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3d art render of a acrocanthosaurus about make a meal of a Uberabasuches.
Made with Bryce 7 Pro, some post work with photoshop.
Best viewed large.

Acrocanthosaurus meaning “high-spined lizard”) is a genus of
theropod dinosaur that existed in what is now North America during
the Aptian and early Albian stages of the Early Cretaceous. Like most
dinosaur genera, Acrocanthosaurus contains only a single species, A.
atokensis. Its fossil remains are found mainly in the U.S. states of
Oklahoma, Texas, and Arkansas, although teeth attributed to
Acrocanthosaurus have been found as far east as Maryland.

Acrocanthosaurus was a bipedal predator. As the name suggests, it is
best known for the high neural spines on many of its vertebrae, which
most likely supported a ridge of muscle over the animal’s neck, back
and hips. Acrocanthosaurus was one of the largest theropods,
approaching 12 meters (40 ft) in length, and weighing up to 6–7
metric tons (6.5–7.5 short tons). Large theropod footprints
discovered in Texas may have been made by Acrocanthosaurus, although
there is no direct association with skeletal remains.

Recent discoveries have elucidated many details of its anatomy, allowing for specialized studies focusing on its brain structure and forelimb function. Acrocanthosaurus was the largest theropod in its ecosystem and likely an apex predator which possibly preyed on large sauropods and ornithopods

Although slightly smaller than colossal relatives like Giganotosaurus, Acrocanthosaurus was still among the largest theropods ever to exist. The longest known individual measured 11.5 meters (38 ft) from snout to tail tip and weighed an estimated 6,000–7,000 kilograms (13,000–15,000 lb).1 Its skull alone was nearly 1.3 meters (4.3 ft) in length.

The skull of Acrocanthosaurus, like most other allosauroids, was long, low and narrow. The weight-reducing opening in front of the eye socket (antorbital fenestra) was quite large, more than a quarter of the length of the skull and two-thirds of its height. The outside surface of the maxilla (upper jaw bone) and the upper surface of the nasal bone on the roof of the snout were not nearly as rough-textured as those of Giganotosaurus or Carcharodontosaurus. Long, low ridges arose from the nasal bones, running along each side of the snout from the nostril back to the eye, where they continued onto the lacrimal bones. This is a characteristic feature of all allosauroids. Unlike Allosaurus, there was no prominent crest on the lacrimal bone in front of the eye. The lacrimal and postorbital bones met to form a hick brow over the eye, as seen in carcharodontosaurids and the unrelated abelisaurids. Nineteen curved, serrated teeth lined each side of the upper jaw, but a tooth count for the lower jaw has not been published. Acrocanthosaurus teeth were wider than those of Carcharodontosaurus and did not have the wrinkled texture that characterized the archarodontosaurids. The dentary (tooth-bearing lower jaw bone) was squared off at the front edge, as in Giganotosaurus, and shallow, while the rest of the jaw behind it
became very deep. Acrocanthosaurus and Giganotosaurus shared a thick horizontal ridge on the outside surface of the surangular bone of the lower jaw, underneath the articulation with the skull.

The most notable feature of Acrocanthosaurus was its row of tall neural spines, located on the vertebrae of the neck, back, hips and upper tail, which could be more than 2.5 times the height of the vertebrae from which they extended. Other dinosaurs also had high spines on the back, sometimes much higher than those of Acrocanthosaurus. For instance, the unrelated Spinosaurus had spines nearly 2 meters (6.5 ft) tall, about 11 times taller than the bodies of its vertebrae. Rather than supporting a skin ‘sail’ as seen in Spinosaurus, the lower spines of Acrocanthosaurus had attachments for
powerful muscles like those of modern bison, probably forming a tall,
thick ridge down its back. The function of the spines remains unknown, although they may have been involved in communication, fat storage, or temperature control. All of its cervical (neck) and dorsal (back) vertebrae had prominent depressions (pleurocoels) on the sides, while the caudal (tail) vertebrae bore smaller ones. This is more similar to carcharodontosaurids than to Allosaurus.

Aside from its vertebrae, Acrocanthosaurus had a typical allosauroid keleton. Acrocanthosaurus was bipedal, with a long, heavy tail counterbalancing the head and body, maintaining its center of gravity over its hips. Its forelimbs were relatively shorter and more robust than those of Allosaurus but were otherwise similar: each hand bore three clawed digits. Unlike many smaller fast-running dinosaurs, its femur was longer than its tibia and metatarsals, suggesting that Acrocanthosaurus was not a fast runner. Unsurprisingly, the hind leg bones of Acrocanthosaurus were proportionally more robust than its
smaller relative Allosaurus. Its feet had four digits each, although has is typical for theropods, the first was much smaller than the rest and did not make contact with the ground.

Uberabasuchus terrificus was relatively small terrestrial crocodile from Late Cretaceous (70 mya). The fossil was found near Uberaba, an inland city in southeastern Brazil.Length 2.5 m (10 feet).

Artwork Comments

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