. Bulletin of the British Museum (Natural History) Zoology. quadratojugal process Fig. 7 Right suborbital region of lacertid skulls in ventral view. a. Podarcis sicula; b. Psammodromus algirus with inner crest of jugal bone clearly visible behind ectopterygoid. Post-cranial skeleton. Fig. 8 Scleral ossicles of Acanthodactylus; arrow indicates scleral ossicle 14 which lacks a peripheral radial portion. From Arnold (1983). 13 Contact between squamosal and parietal bones (Fig. 5). Absent (0); present (1). 14 Shape of squamosal bone (Fig. 5). Slender (0); deep posteriorly (pistol shaped) (1). 15 Q
. Bulletin of the British Museum (Natural History) Zoology. quadratojugal process Fig. 7 Right suborbital region of lacertid skulls in ventral view. a. Podarcis sicula; b. Psammodromus algirus with inner crest of jugal bone clearly visible behind ectopterygoid. Post-cranial skeleton. Fig. 8 Scleral ossicles of Acanthodactylus; arrow indicates scleral ossicle 14 which lacks a peripheral radial portion. From Arnold (1983). 13 Contact between squamosal and parietal bones (Fig. 5). Absent (0); present (1). 14 Shape of squamosal bone (Fig. 5). Slender (0); deep posteriorly (pistol shaped) (1). 15 Quadratojugal process on jugal bone (Fig. 6). Distinct (0); usually very reduced or absent (1). 16 Exposure of anterior part of jugal bone on side of skull (Fig. 6). Small (0); large (1). 17 Lower border of outer face of jugal bone (Fig. 6). Not markedly stepped (0); often markedly stepped (1). 18 Inner crest of jugal bone clearly visible behind ectopterygoid in ventral view (Fig. 7). No (0); yes (1). 19 Ossification of temporal scales. Not extensive (0); exten- sive (1). 20 Lateral teeth. With two cusps or sometimes one (0); usually with three or more cusps (1). 21 Peripheral radial portion of scleral ossicle 14 (Fig. 8). Present (0); absent (1). , Clavicle (Fig. 9). Variable within species, medial part loop-shaped, either continuous or interrupted pos- teriorly (0,0); always interrupted posteriorly (1,0); never interrupted posteriorly (0,1). 23 Expansion of medial section of clavicle (Fig. 9). Strong (0); weak (1). 24 Shape of interclavicle (Fig. 10). Cruciform, with arms directed laterally, or obliquely forwards (0); arms directed obliquely backwards (1). 25 Interclavicle flanged. No (0); yes (1). , , Sternal fontanelle (Fig. 10). Large and roughly elliptical (0,0,0); sometimes very weakly heart- shaped (1,0,0); clearly heart-shaped in at least some in- dividuals (1,1,0); small and round, or absent (0,0,1). 27 Xiphisternal cartilages (Fig. 10). Close tog
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