Community hub
Recent from talks
Knowledge base stats:
Talk channels stats:
Members stats:
Rutiodon
Rutiodon (meaning "wrinkle tooth") is an extinct genus of mystriosuchine phytosaurs from the Late Triassic of the eastern United States. The type species of Rutiodon, Rutiodon carolinensis, encompasses a large number of skulls and assorted postcranial fossils discovered in the Cumnock Formation of North Carolina. Fossils referable to the species are also known from Pennsylvania, New Jersey, and Virginia. Rutiodon carolinensis is the most well-described species of phytosaur in eastern North America, though its validity as a natural taxon has been questioned. Some paleontologists also recognize a larger and more robust species, Rutiodon manhattanensis, which is known from teeth and postcranial fossils from New Jersey and Pennsylvania.
Like other phytosaurs, Rutiodon strongly resembled a crocodile, but its nostrils were positioned far back on the head, close to the eyes, instead of at the tip of the snout. It had enlarged front teeth, and a relatively narrow jaw, somewhat resembling that of a modern gharial. This suggests that this carnivore probably caught fish and it may also have snatched land animals (such as Coelophysis) from the waterside. Also, like modern crocodiles, its back, flanks, and tail were covered with bony armored plates.
Rutiodon was among the largest carnivorous animals of its environment, measuring up to 8 metres (26 ft) long and weighing about 1 metric ton (1.1 short tons).
The type species of Rutiodon is R. carolinensis. It was originally named by Ebenezer Emmons in 1856, based on fossils from the Deep River coal field (Cumnock Formation) of North Carolina. The original fossils include five striated teeth and associated vertebrae, ribs, and interclavicle fragments.
Later, Emmons (1860) mentioned that he had discovered a nearly complete skull of R. carolinensis from North Carolina, at the time the most complete phytosaur skull known from the United States. It is also the largest skull referred to Rutiodon, at a length of 77.3 cm (30.4 inches). This skull was described in more detail by Edwin H. Colbert in 1947. Emmons' phytosaur skull was originally stored in the Williams College geological museum, and was later transferred to the National Museum of Natural History (USNM). Many skulls and partial skeletons of R. carolinensis have been discovered near Egypt, North Carolina, and are now housed and displayed at the American Museum of Natural History (AMNH).
In 1963, a small partial phytosaur skull (AMNH 5500) was discovered at the Granton Quarry of North Bergen, New Jersey. This skull, recovered from grey argillite of the Lockatong Formation, was described by Colbert in 1965. He identified the skull as a probable juvenile specimen of R. carolinensis. Doyle and Sues (1995) described a well-preserved phytosaur skull (SMP VP-45) from the New Oxford Formation in York County, Pennsylvania. This skull was very similar to skulls previously referred to R. carolinesis. They considered R. carolinensis to be an undiagnostic species, as it was originally diagnosed based on teeth. According to these authors, "Rutiodon" is a metataxon of eastern phytosaurs for which monophyly cannot be established.
Since its original description, R. carolinensis has been conflated with various other phytosaur species from the eastern United States. Isaac Lea named several phytosaur species from Pennsylvania shortly before Emmons' description: Clepsysaurus pennsylvanicus (in 1851) and Centemodon sulcatus (in 1856). Both species were compared favorably with R. carolinensis by Emmons, and some authors have noted that either could be considered a senior synonym of Rutiodon. Nevertheless, fossils of R. carolinensis are much more complete, so the validity of the genus is rarely questioned. Clepsysaurus and Centemodon are most commonly considered dubious and undiagnostic, and their fossils have variably been referred to Rutiodon, Phytosaurus, or Phytosauria incertae sedis by different authors.
Othniel Charles Marsh (1893) named Belodon validus, based on a scapula from the New Haven Arkose near Simsbury, Connecticut. In 1896, Marsh mentioned a phytosaur skull from Chatham County, North Carolina. This was the second phytosaur skull found in the area, after that of Emmons (1860). Marsh named his phytosaur skull Rhytidodon rostratus. Belodon validus is considered dubious and undiagnostic, while "Rhytidodon rostratus" (specimen USNM 5373) has been referred to R. carolinensis.
Hub AI
Rutiodon AI simulator
(@Rutiodon_simulator)
Rutiodon
Rutiodon (meaning "wrinkle tooth") is an extinct genus of mystriosuchine phytosaurs from the Late Triassic of the eastern United States. The type species of Rutiodon, Rutiodon carolinensis, encompasses a large number of skulls and assorted postcranial fossils discovered in the Cumnock Formation of North Carolina. Fossils referable to the species are also known from Pennsylvania, New Jersey, and Virginia. Rutiodon carolinensis is the most well-described species of phytosaur in eastern North America, though its validity as a natural taxon has been questioned. Some paleontologists also recognize a larger and more robust species, Rutiodon manhattanensis, which is known from teeth and postcranial fossils from New Jersey and Pennsylvania.
Like other phytosaurs, Rutiodon strongly resembled a crocodile, but its nostrils were positioned far back on the head, close to the eyes, instead of at the tip of the snout. It had enlarged front teeth, and a relatively narrow jaw, somewhat resembling that of a modern gharial. This suggests that this carnivore probably caught fish and it may also have snatched land animals (such as Coelophysis) from the waterside. Also, like modern crocodiles, its back, flanks, and tail were covered with bony armored plates.
Rutiodon was among the largest carnivorous animals of its environment, measuring up to 8 metres (26 ft) long and weighing about 1 metric ton (1.1 short tons).
The type species of Rutiodon is R. carolinensis. It was originally named by Ebenezer Emmons in 1856, based on fossils from the Deep River coal field (Cumnock Formation) of North Carolina. The original fossils include five striated teeth and associated vertebrae, ribs, and interclavicle fragments.
Later, Emmons (1860) mentioned that he had discovered a nearly complete skull of R. carolinensis from North Carolina, at the time the most complete phytosaur skull known from the United States. It is also the largest skull referred to Rutiodon, at a length of 77.3 cm (30.4 inches). This skull was described in more detail by Edwin H. Colbert in 1947. Emmons' phytosaur skull was originally stored in the Williams College geological museum, and was later transferred to the National Museum of Natural History (USNM). Many skulls and partial skeletons of R. carolinensis have been discovered near Egypt, North Carolina, and are now housed and displayed at the American Museum of Natural History (AMNH).
In 1963, a small partial phytosaur skull (AMNH 5500) was discovered at the Granton Quarry of North Bergen, New Jersey. This skull, recovered from grey argillite of the Lockatong Formation, was described by Colbert in 1965. He identified the skull as a probable juvenile specimen of R. carolinensis. Doyle and Sues (1995) described a well-preserved phytosaur skull (SMP VP-45) from the New Oxford Formation in York County, Pennsylvania. This skull was very similar to skulls previously referred to R. carolinesis. They considered R. carolinensis to be an undiagnostic species, as it was originally diagnosed based on teeth. According to these authors, "Rutiodon" is a metataxon of eastern phytosaurs for which monophyly cannot be established.
Since its original description, R. carolinensis has been conflated with various other phytosaur species from the eastern United States. Isaac Lea named several phytosaur species from Pennsylvania shortly before Emmons' description: Clepsysaurus pennsylvanicus (in 1851) and Centemodon sulcatus (in 1856). Both species were compared favorably with R. carolinensis by Emmons, and some authors have noted that either could be considered a senior synonym of Rutiodon. Nevertheless, fossils of R. carolinensis are much more complete, so the validity of the genus is rarely questioned. Clepsysaurus and Centemodon are most commonly considered dubious and undiagnostic, and their fossils have variably been referred to Rutiodon, Phytosaurus, or Phytosauria incertae sedis by different authors.
Othniel Charles Marsh (1893) named Belodon validus, based on a scapula from the New Haven Arkose near Simsbury, Connecticut. In 1896, Marsh mentioned a phytosaur skull from Chatham County, North Carolina. This was the second phytosaur skull found in the area, after that of Emmons (1860). Marsh named his phytosaur skull Rhytidodon rostratus. Belodon validus is considered dubious and undiagnostic, while "Rhytidodon rostratus" (specimen USNM 5373) has been referred to R. carolinensis.