. Bonner zoologische Monographien. Zoology. SMITH, ON I UI PHYLOGENETIC AFFINITY OF fHE EXTINCT ACRODONTAN LIZARD TINOSAURUS premaxillary morphotype. The apomorphic presence of a posterior shelf with dorsal facet (see below) sup- ports referral to Acrodonta rather than to Iguanidae. Most of the description, except where otherwise in- dicated, comes from the more complete PTRM 19515. Description: The smallest specimen (PTRM 19429) is mm across the main body, the largest (PTRM 19515) mm. The anterior margin of the bone is distinctly curved in dorsal view (Fig. la). It extends nearly dors
. Bonner zoologische Monographien. Zoology. SMITH, ON I UI PHYLOGENETIC AFFINITY OF fHE EXTINCT ACRODONTAN LIZARD TINOSAURUS premaxillary morphotype. The apomorphic presence of a posterior shelf with dorsal facet (see below) sup- ports referral to Acrodonta rather than to Iguanidae. Most of the description, except where otherwise in- dicated, comes from the more complete PTRM 19515. Description: The smallest specimen (PTRM 19429) is mm across the main body, the largest (PTRM 19515) mm. The anterior margin of the bone is distinctly curved in dorsal view (Fig. la). It extends nearly dorsally from just above its ventral edge (it is only weakly convex in sagittal cross-section), then curves abruptly toward the posterior (Fig. lb). The nasal process (), only the base of which is pre- served, extends posterodorsally; its anterior surface is weakly convex in cross-section (Fig. lb, c). A facet for the nasal is not present on the preserved portion of the nasal process (Fig. Id). Lateral to the base of the nasal process on each side is a pair of tiny foram- ina, which presumably correspond to the posterior premaxillary foramina () of Bahl (1937); through them the maxillary artery and a portion of the ethmoidal nerve entered. On the left side of PTRM 19307 that foramen is single, not double. Lateral to these foramina is a rounded ridge that extends to the lateral-most margin of the bone and. FIG. 1. Partial premaxilla of Tinosaurus sp. MPH, PTRM 19515, in (a) dorsal, (b) right lateral, (c) anterodor- sal, and (d) posteroventral views. Abbreviations: , anterior premaxillary foramen; , incisive process; , nasal process; , palatal shelf; , posterior premaxillary foramen. 11. 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 Bonn, Zoologisches Forschungsinstitut un
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