. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. f im. Figure 28. The lower jaw of Epicrionops petersi (from Nussbaum, 1977, fig. 2) in (A) lateral, (B) medial, and (C) dorsal views. primary difference between the configu- ration of the mandibular facets of modern caecilians and E. micropodia is that, in the former, an anteromedial component of the facet is recurved to form a U-shaped fossa, whereas the entire facet in E. micropodia is, by comparison, essentially planar. The internal process of Eocaecilia mi- cropodia is notable for its large size. Rel- ati
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. f im. Figure 28. The lower jaw of Epicrionops petersi (from Nussbaum, 1977, fig. 2) in (A) lateral, (B) medial, and (C) dorsal views. primary difference between the configu- ration of the mandibular facets of modern caecilians and E. micropodia is that, in the former, an anteromedial component of the facet is recurved to form a U-shaped fossa, whereas the entire facet in E. micropodia is, by comparison, essentially planar. The internal process of Eocaecilia mi- cropodia is notable for its large size. Rel- ative to the length of the lower jaw, the process has greater apicobasal height, as well as greater anteroposterior width across the base, than those in selected rep- resentatives of Rhinatrematidae, Ichthy- ophiidae, Caeciliidae, and Typhlonectidae (Table 1). Only scolecomorphids lack an internal process (Nussbaum, 1985). Fur- thermore, the process in Eocaecilia differs in position, lying approximately at the level of the mandibular fossa for adductor mus- culature and anterior to the jaw articula- tion, whereas in Recent taxa, the base of the internal process is typically at the level of the jaw articulation and slightly poste- rior to the adductor fossa. In all of these features, E. micropodia also differs from the Early Cretaceous caecilian Rubrica- caecilia monbaroni, which Evans and Sig-. 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. Cambridge, Mass. : The Museum
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