Image: Stegoceras ossified tendons

Description: Elements typifying the five tendon morphotypes of Gilmore (Stegoceras validum) in internal and external views. A) Type 1 – ‘Heavy segments’ – “Large, heavy, sinuous segments with more or less flattened ends that are sometimes grooved with ray-like points” ([3]:31). These show right and left symmetry. One element reflected in the vertical plane: left; external view, right; internal view. B) Type 2 – ‘Double pointed segments’ – “Smaller, subround, sinuous segments having both ends slightly flattened and slenderly pointed” ([3]:32). Two elements of each ‘side’ are shown, reflected in the horizontal plane: upper; external view, lower; internal view. C) Type 3 – ‘Attenuated segments’ – “Of about the same size as the second, subround, sinuous, with one flattened end, the other drawn out into a slender attenuated rod-like process” ([3]:32). Two elements reflected in the vertical plane and of uncertain orientation. D) Type 4 – ‘Bifurcated segments - Rare (only two elements known). “Small, with long bifurcated divergent rounded processes at one end, with the other end unknown” ([3]:32). Two elements reflected in the horizontal plane: upper; external view, lower; internal view. E) Type 5 – ‘Median segments’ - Also rare. “Three small bones that are suggestive of being bilateral median segments, but the fact that both are asymmetrical would rather negative this suggestion” ([3]:32). These were incorrectly labeled as Type 4 four in Plate 14 of [3]. Two elements reflected in the horizontal plane and of uncertain orientation.
Title: Stegoceras ossified tendons
Credit: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0030212
Author: Caleb Marshall Brown, Anthony P. Russell
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