THE UNIVERSITY OF CALGARY Eric Snively A ... - Ohio University

has a very shallow U-shape. The shaft of the metatarsal is fairly slender, and
narrows only slightly to a point about 85% along its distoproximal axis. From
there the metatarsal widens again, but its proximal width is less than the width at
midshaft.
1 0. Herrerasaurus ischigualasfensis
a) Ginglymus. The ginglymus of MT III appears reniform in anterior view, and
its distal edge inclines somewhat proximomedially (Figure 2.1 g). The flexor notch
is proximodistally compressed and becornes sharply defined laterally, so that a
thin ridge overhangs the dorsolateral edge of the ginglymus (Figure 2.1 g).
b) Shaft and region of proximal articulation (distal to proximal; Figure 2-19).
The narrowest point along the long axis of the metatarsal occurs at 20-25% of its
length from the distal end. The shaft varies Iittle in width, but twists laterally
where it articulates with MT II and MT IV. In this region, figures of al1 three
metatarsals indicate that the MT Ill of Henerasaurus is slightly wider along its
posterior border than along its anterior face (Novas 1994).
1 1. Plateosaurus engelhaMi.
a) Ginglymus. The ginglymus is quite Iow, and the flexor notch is only a
shallow indentation. Distal to the main shaft, the metatarsal is somewhat wider
posterioriy than anterioriy. Consequentially, the collateral ligament fossae are
visible in anterior view (Figure 2.1 h).