. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 314 Bulletin Museum of Comparative Zoology, Vol. 158, No. 6. Figure 19. Stapes-quadrates of Eocaecilia micropodia. (A) Left side of the type specimen (MNA V8066) in oblique posterolateral view, showing articulation with pseudoangular. (B) Lateral view of right stapes-quadrate of MCZ 9169. skull roof, near or at the occipital margin (a relationship preserved only in the ho- lotype, Fig. 2). An approximately oval articular facet is situated at the middle of the lateral surface of the stapes-quadrate (Figs. 19B,
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 314 Bulletin Museum of Comparative Zoology, Vol. 158, No. 6. Figure 19. Stapes-quadrates of Eocaecilia micropodia. (A) Left side of the type specimen (MNA V8066) in oblique posterolateral view, showing articulation with pseudoangular. (B) Lateral view of right stapes-quadrate of MCZ 9169. skull roof, near or at the occipital margin (a relationship preserved only in the ho- lotype, Fig. 2). An approximately oval articular facet is situated at the middle of the lateral surface of the stapes-quadrate (Figs. 19B, 21C). In MCZ 9235, the dimensions of the facet in the anteroposterior and dorsoventral planes are, respectively, and mm; comparable dimensions are seen in MCZ 9169 (, mm). The jaw joint is formed by the apposition of this facet with another on the medial surface of the pseu- doangular (Figs. 19A, 24C, 26B; see also Jenkins and Walsh, 1993, fig. le). The sur- faces of both facets are of "unfinished" bone, evidence of a cartilaginous covering and a synovial joint. The facet on the sta- pes-quadrate faces principally laterally but is inclined slightly ventrally (Fig. 29A); the relatively flat surface, which exhibits a very shallow anteroposterior concavity, con- trasts markedly with the complexly config- ured quadrate and pseudoangular facets in Recent gymnophionans (Fig. 29B, C). An- terior to this facet is a rounded, transverse bar that forms the posterior margin of the adductor chamber; relative to the lower jaw, the bar is positioned at a point just posterior to the insertion of the adductor muscles. The finished surface of the bone lacks any indication of articular cartilage;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambri
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