. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 318 Bulletin Museum of Comparative Zoology, Vol. 158, No. 6. | bone HI jaw muscles flif] cartilage connective tissue Figure 23. Horizontal section of the quadrate region of Ichthyophis glutinosus exhibiting an extensive cartilaginous contact between the stapes and quadrate, with both bones contributing to the facet for the pseudoangular. Based on serial sections in the collection of Marvalee H. Wake, Department of Integrative Biology, University of California, Berkeley. unexpected specialization. Second, post
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 318 Bulletin Museum of Comparative Zoology, Vol. 158, No. 6. | bone HI jaw muscles flif] cartilage connective tissue Figure 23. Horizontal section of the quadrate region of Ichthyophis glutinosus exhibiting an extensive cartilaginous contact between the stapes and quadrate, with both bones contributing to the facet for the pseudoangular. Based on serial sections in the collection of Marvalee H. Wake, Department of Integrative Biology, University of California, Berkeley. unexpected specialization. Second, postu- lating the loss of an arterial foramen from one element and its reappearance in an- other would require at least some corrob- orative evidence, of which there is none. Lower Jaw. Among the most durable of skeletal elements, the lower jaws of Eocae- cilia micropodia are represented in artic- ulation with several skulls (Figs. 3, 11, 13), as well as by numerous isolated specimens (Figs. 24-26). In contrast, no bones could be recognized as belonging to the hyo- branchial apparatus, a not unexpected finding because the hyobranchial appara- tus does not ossify in the adults of Recent caecilians. Eocaecilia micropodia shares with most living caecilians the following unique com- bination of mandibular features: The jaw comprises two distinct bones— the pseudodentary and the pseudoangu- lar—which extensively overlap along their medial and lateral surfaces, respectively, and are thus joined along a wide suture that transects the jaw obliquely (Fig. 25C, D). There is no trace of any other separate ossification. The pseudoangular, which in- corporates the articular, forms the mandib- ular articulation with the skull (Figs. 24C, G, 25F, 26B). A lingual (or splenial) row of pedicellate teeth, which parallels the primary labial. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of thes
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