Eudibamus cursoris

Overview

Eudibamus cursoris is a small Permian reptile with a slender body, long limbs, and a very long tail. Its hind limbs, longer than its forelimbs, and its elongated feet are striking. Skeletal proportions became clues for exploring the movement of ancient reptiles.^[1]

Key facts

In a study of the type specimen, the tail was calculated to account for about 64% of the total axial body length. In 2021, researchers discussed how this long tail might have affected the body's center of mass and the maintenance of a two-legged posture. The long portion extending behind the slender body thus contains clues for interpreting movement.^[1]

Time and place

It has been studied as Artinskian material of the Early Permian. The fossils came from the Tambach Formation at the Bromacker locality in the Thuringian Forest of present-day Germany. Place names near Tambach-Dietharz and Gotha help locate the home of this ancient terrestrial animal.^[1]

The time range describes source context, not the complete duration of this species.

Size, form and skeleton

The type specimen MNG8852 preserves the skeleton of the trunk, limbs, and long tail extending behind them. The ribs are short and very slender, and the limb bones are also slender and long. The lengths of the hind limbs and hind feet are particularly useful features to observe in understanding the body's overall impression.^[1]

The type specimen MNG 8852 of Eudibamus has a total skeletal length of about 26 cm. Its small body, preserved with little distortion, continues into elongated hind limbs and a tail.^[2]

Habitat and reproduction

Bromacker has yielded fossils of various tetrapods, from terrestrial to semiaquatic groups. The paper explains that the Tambach Formation accumulated in an upland inland basin. Researchers interpreted Eudibamus as a small herbivore and suggested that rapid movement may have helped it evade predators rather than catch prey.^[1]

Fossil discovery

The type specimen of this species was briefly introduced in 2000, and its skeleton was described in detail in a 2021 study. A second partial skeleton from the same locality, MNG12895, was also used for comparison. The addition of new material expanded descriptions of the skeleton and growth.^[1]

References

1. Berman et al. (2021) — The skeleton and movement of Eudibamus
2. Berman et al. (2000) — An Early Permian reptile that ran on two legs
3. Cocude-Michel (1963) — A study of Late Jurassic Rhynchocephalia
4. Zitteliana study — Comparison of the limbs of Homoeosaurus

Research questions

The researchers interpreted differences in the degree of ossification of the ankle bones in the two specimens as differences in growth stage. They also discussed a gait in which the legs moved forward and backward beneath the body, based on the structures of the long limbs, feet, and pelvis. This led to the authors' functional interpretation that both bipedal and quadrupedal running would have been possible.^[1]

Observation

The illustration centers on the slender trunk, four limbs, and long, tapering tail of the type specimen MNG8852. Read the overall outline from the skeleton, then move your gaze to the longer hind limbs and feet. Details of the head and hands, the body covering, and the colors and posture are interpretations intended to connect and present the surviving bones.^[1]