Aetonyx
Dubious Early Jurassic sauropodomorph from southern Africa.
Aetonyx is a poorly understood genus of sauropodomorph dinosaur from the Early Jurassic of southern Africa. The only recognized species, A. palustris, was established by Robert Broom in 1911 using a partial skeleton collected by A. R. Walker from the upper Elliot Formation near Fouriesburg in what is now the Free State Province. The specimen, cataloged as SAM-PK-2768-2770, is housed at the Iziko South African Museum. It includes three neck vertebrae, one back vertebra, several distal tail vertebrae, a shoulder blade with coracoid, parts of the forelimb (including a 17.4-centimeter humerus, radius, ulna, and both hands), and hind limb elements (the upper end of a tibia and a nearly complete foot). The name Aetonyx, meaning "eagle claw" from the Greek *aetos* and *onyx*, likely refers to the large claw on the second toe, which Broom thought resembled those of birds and might have been used for grasping or climbing.
- named_by
- Robert Broom
- year_named
- 1911
- species
- Aetonyx palustris
- field
- Paleontology
- formation
- Upper Elliot Formation
- location
- Fouriesburg, Free State Province, South Africa
- current_status
- Indeterminate sauropodomorph (nomen dubium)
Lore & Background
Aetonyx was named in 1911 by Robert Broom from a fragmentary skeleton excavated by A. R. Walker, now stored at the Iziko South African Museum (specimen number SAM-PK-2768-2770). The specimen includes three neck vertebrae, one back vertebra, distal tail vertebrae, a shoulder blade with coracoid, parts of the forelimb and hind limb, and an almost complete foot. The humerus was 17.4 cm in length. The name translates to 'eagle claw', likely referring to the large claw on the second toe, which Broom thought resembled those of birds and could have been used for grasping or climbing.
Reader's Guide
Aetonyx palustris is significant primarily for its complex taxonomic history, illustrating the challenges of classifying fragmentary dinosaur fossils. Originally described by Broom as a carnivorous dinosaur, it was later placed within Carnosauria by von Huene, who noted elongated hand phalanges as possible adaptations for prey capture. However, subsequent research synonymized it with Massospondylus harriesi and Massospondylus carinatus. A 2004 review by Galton and Upchurch ultimately deemed the remains undiagnostic, listing Aetonyx palustris as an indeterminate sauropodomorph and a nomen dubium. This history underscores how early 20th-century interpretations of basal sauropodomorphs as theropods were later revised, and how fragmentary specimens can lead to prolonged taxonomic uncertainty.
Did You Know?
- Aetonyx was named by Robert Broom in 1911 based on a fragmentary skeleton from the upper Elliot Formation.
- The name Aetonyx means 'eagle claw', from the Ancient Greek aetos and onyx.
- In 1932, Friedrich von Huene classified Aetonyx within Carnosauria and noted its elongated hand phalanges.
- A 2004 review listed Aetonyx palustris as an indeterminate sauropodomorph and a nomen dubium.
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