. Bulletin of the British Museum (Natural History). RELATIONSHIPS OF LACERTA, ALGYROIDES AND PSAMMODROMUS 303 9. Clavicle (Fig. 3) Some individuals of Lacerta, Algyroides and Psammodromus have clavicles that correspond to the condition found in the Lacertidae as a whole. In these the clavicle is greatly expanded near the midline and the expansion is penetrated by a large foramen so that the bone in this region forms a continuous loop (Fig. 3(2)).. Fig. 3. Variations in clavicle, interclavicle and sternum, (i) Clavicle emarginated, inter- clavicle with lateral arras approximately at right angle
. Bulletin of the British Museum (Natural History). RELATIONSHIPS OF LACERTA, ALGYROIDES AND PSAMMODROMUS 303 9. Clavicle (Fig. 3) Some individuals of Lacerta, Algyroides and Psammodromus have clavicles that correspond to the condition found in the Lacertidae as a whole. In these the clavicle is greatly expanded near the midline and the expansion is penetrated by a large foramen so that the bone in this region forms a continuous loop (Fig. 3(2)).. Fig. 3. Variations in clavicle, interclavicle and sternum, (i) Clavicle emarginated, inter- clavicle with lateral arras approximately at right angles to its longitudinal axis, sternum with heart-shaped fontanelle. (2) Clavicle unemarginated, interclavicle with lateral arms directed backwards, sternum with oval fontanelle. c = clavicle, i = inter- clavicle. s = sternum. In other individuals the clavicle is emarginated posteriorly so that the loop is inter- nipted (Fig. 3(1)). This interruption may be minor or the whole posterior section may be missing. In Psatnmodromiis, the species of the subgenus Gallotia and perhaps in L. parva and L. fraasii (the small samples available, 17 and 6 respec- tively, do not permit certainty) the loop of the clavicle is complete in all specimens. In most other species both the intact and emarginated conditions occur, although the proportion of each varies from species to species. In a few Lacerta species. 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 British Museum (Natural History). London : BM(NH)
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