Clifford, A. B. and L. M. Witmer. 2004. Case studies in novel narial ...
Clifford, A. B. and L. M. Witmer. 2004. Case studies in novel narial ...
Clifford, A. B. and L. M. Witmer. 2004. Case studies in novel narial ...
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226 A. B. CLIFFORD AND L. M. WITMER<br />
(a)<br />
oee<br />
oent<br />
on<br />
oelc<br />
ocnv<br />
ci<br />
sm<br />
oppp<br />
oppn<br />
om<br />
oppr<br />
(b)<br />
Fig. 6. Medial view of sagittally sectioned skull of Saiga tatarica; (a) labelled draw<strong>in</strong>g of isosurface of AMNH 202492 based on 3D<br />
reconstructions of CT scans; (b) stereopairs of specimen <strong>in</strong> (a). Scale bars = 5 cm. Abbreviations as <strong>in</strong> Table 1.<br />
to the nasolacrimal canal, a second, triangular tubercle<br />
(Fig. 5a; olt) serves as the attachment of the ventral lateral<br />
cartilage form<strong>in</strong>g the ventral support for the nasolacrimal<br />
canal.<br />
Os maxillare (Figs 4d-e & 6a; om). The maxilla forms<br />
the majority of the bony <strong>narial</strong> aperture <strong>in</strong> saiga. The<br />
shallow angle taken by the maxilla gradually <strong>in</strong>creases<br />
caudally. On the lateral surface of the maxilla between the<br />
<strong>in</strong>fraorbital foramen (Fig. 5a; omfi) <strong>and</strong> the facial crest<br />
(Fig. 5a; omcf ), an angled tubercle with a sharp rostral<br />
marg<strong>in</strong> (Fig. 5a; omti) just rostral to the tuber faciale<br />
serves as the skeletal attachment of the maxillolabial<br />
muscles (i.e. the levator labii superioris, the can<strong>in</strong>us, <strong>and</strong><br />
the depressor labii superioris). These muscles fan out<br />
along the lateral side of the proboscis, act<strong>in</strong>g to compress
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