The neck is short, with keels along the lower edge of its vertebrae (like other herrerasaurids) and long transverse processes (like Sanjuansaurus specifically).
The dorsal vertebrae are similar to those of other herrerasaurids, though the tips of the neural spines are only slightly expanded.
As with herrerasaurids and most non-dinosaur reptiles, only two vertebrae form the sacrum.
However, Gnathovorax also has its last dorsal vertebra encompassed by the ilium (upper hip plate), although its transverse processes are not long enough to contact the ilium; therefore, it does not qualify as a sacral vertebra.
The tail vertebrae are most similar to Herrerasaurus, with low and elongated zygapophyses, upwards-pointing neural spines, and transverse processes which are semicircular in cross section.

Gnathovorax is the only herrerasaurid combining features of the scapula such as posterior curvature, an expanded tip, and no fusion with the coracoid.
The rest of the forearm is similar to that of Herrerasaurus, with a strongly developed elbow area and a long hand.
The ilium is short, although it has a pointed front tip in contrast with the rounded front edge of other herrerasaurids.
Gnathovorax is the only herrerasaurid in which the pubis is both sinuous in front view, and projects straight down in side view.
The pubis also possesses a large pubic boot with a smooth lower edge, similar to other herrerasaurids, although it lacks the beveled pubic booth of Staurikosaurus.
Unlike other herrerasaurids (but like lagerpetids), the ischium has a hole known as an obturator foramen at its base.
The femoral head is more simple than that of other herrerasaurids, with a small craniomedial tuber (front inner bump) and no caudomedial tuber (rear inner bump).
Otherwise the femur possesses all the muscle attachment sites typical of basal dinosaurs.
The tibia is 90% the length of the femur, unlike Staurikosaurus which has a longer tibia.
The rest of the lower leg is similar to Herrerasaurus, but the foot has three phalanges (toe bone) in the fifth toe, while Herrerasaurus only has one.
The neck is short, with keels along the lower edge of its vertebrae (like other herrerasaurids) and long transverse processes (like Sanjuansaurus specifically). The dorsal vertebrae are similar to those of other herrerasaurids, though the tips of the neural spines are only slightly expanded. As with herrerasaurids and most non-dinosaur reptiles, only two vertebrae form the sacrum. However, Gnathovorax also has its last dorsal vertebra encompassed by the ilium (upper hip plate), although its transverse processes are not long enough to contact the ilium; therefore, it does not qualify as a sacral vertebra. The tail vertebrae are most similar to Herrerasaurus, with low and elongated zygapophyses, upwards-pointing neural spines, and transverse processes which are semicircular in cross section.
Gnathovorax is the only herrerasaurid combining features of the scapula such as posterior curvature, an expanded tip, and no fusion with the coracoid. The rest of the forearm is similar to that of Herrerasaurus, with a strongly developed elbow area and a long hand. The ilium is short, although it has a pointed front tip in contrast with the rounded front edge of other herrerasaurids. Gnathovorax is the only herrerasaurid in which the pubis is both sinuous in front view, and projects straight down in side view. The pubis also possesses a large pubic boot with a smooth lower edge, similar to other herrerasaurids, although it lacks the beveled pubic booth of Staurikosaurus. Unlike other herrerasaurids (but like lagerpetids), the ischium has a hole known as an obturator foramen at its base. The femoral head is more simple than that of other herrerasaurids, with a small craniomedial tuber (front inner bump) and no caudomedial tuber (rear inner bump). Otherwise the femur possesses all the muscle attachment sites typical of basal dinosaurs. The tibia is 90% the length of the femur, unlike Staurikosaurus which has a longer tibia. The rest of the lower leg is similar to Herrerasaurus, but the foot has three phalanges (toe bone) in the fifth toe, while Herrerasaurus only has one.
Gnathovorax