. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. c f-y. â â¢â¢/.. Vi pit. Figure 17. (A) Reconstruction of the braincase in Eocaecilia micropodia in lateral view. The reconstruction is based on the holotype (MNA V8066; Figs. 2, 3) and MNA V8059 (Fig. 7). The sphenethmoid (sph) component of the braincase in (B) dorsal and (C) ventral views. modern taxa, the bone serves a supporting role in the anterior portion of the skull by extending dorsoventrally from the cultri- form process of the os basale to the ventral surface of the skull roof. The spheneth- moid i
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. c f-y. â â¢â¢/.. Vi pit. Figure 17. (A) Reconstruction of the braincase in Eocaecilia micropodia in lateral view. The reconstruction is based on the holotype (MNA V8066; Figs. 2, 3) and MNA V8059 (Fig. 7). The sphenethmoid (sph) component of the braincase in (B) dorsal and (C) ventral views. modern taxa, the bone serves a supporting role in the anterior portion of the skull by extending dorsoventrally from the cultri- form process of the os basale to the ventral surface of the skull roof. The spheneth- moid is not exposed dorsally as a compo- nent of the skull roof, nor is it in most Recent caecilians: rhinatrematids (, Epicrionops, Nussbaum, 1977, fig. 1; Wake, 2003, fig. 5A), ichthyophiids (Ichth- yophis sp., Wake, 2003, fig. 5G), uraeo- typhlids (Uraeotyphlus narayani, Wake, 2003, fig. 6A), scolecomorphids (Scoleco- morphus uluguruensis, Wake, 2003, fig. 6D), and typhlonectids (Typhlonectes co?n- pressicauda and T. natans, Wake, 2003, fig. 6G, J; Potomotyphlus kaupii, Wilkinson and Nussbaum, 1997, fig. 8B; see also Tay- lor, 1969; Wiedersheim, 1879). Dorsal ex- posure of the sphenethmoid does occur in various extant caeciliids in which the bone appears as a median element between the frontals (Taylor, 1969; Wake, 2003). The anterior portion of the sphenethmoid of E. micropodia also extends toward the lateral margin of the skull. In Epicrionops, the sphenethmoid continues as a cartilaginous posterior wall of the narial passage (Fig. 14B), possibly adding an additional but- tress against the compressive forces of burrowing. The same process occurs in Ichthyophis (the lamina orbitonasalis of Visser, 1963). The sphenethmoid in Eocaecilia micro- podia is pierced by several foramina. One, located on the posterior face of the lateral. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
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