. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. New Species of Stenocercus from Peru and Bolivia • Codle 207 may differ in patterns of sexual size di- morphism.^^ The Form of the Vertebral Crest. De- spite geographic variation in the promi- nence of the vertebral crest, males and fe- males of Stenocercus prionotiis have a dis- tinctly projecting serrate vertebral crest ex- tending from the nuchal region to the anterior portion of the tail (Figs. 6, 10, 12). The scales of the crest are strongly trian- gular in lateral view, are flaplike (, they bend easily), pro
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. New Species of Stenocercus from Peru and Bolivia • Codle 207 may differ in patterns of sexual size di- morphism.^^ The Form of the Vertebral Crest. De- spite geographic variation in the promi- nence of the vertebral crest, males and fe- males of Stenocercus prionotiis have a dis- tinctly projecting serrate vertebral crest ex- tending from the nuchal region to the anterior portion of the tail (Figs. 6, 10, 12). The scales of the crest are strongly trian- gular in lateral view, are flaplike (, they bend easily), project vertically from the dorsum, and are strongly differentiated from the adjacent dorsal scales. Although the crest is somewhat less developed in fe- males, it is prominent in both sexes. Spec- imens from northern Bolivia and southern Peru have a substantially lower crest than specimens from central and northern Peru (Fig. 10). Nonetheless, the form and pro- jection angle of the crest scales is the same as in the northern populations. In contrast, the scales of the vertebral crest in Stenocercus caducus are only mod- erately differentiated from adjacent dorsal scales in being more strongly keeled and mucronate. The crest in S. caducus is only slightly projecting in males (Fig. 10) and even less so in females (Fig. 12); the crest is mainly apparent on the neck and ante- rior body. In S. caducus, the scales of the crest are stiff and prismatic, and the main axis of projection is posterior rather than vertical, as in S. prionotiis. Crest height in Stenocercus varies posi- tively with size and thus it is critical to compare similar-sized specimens when documenting differences among popula- tion samples or species. This realization has been critical to differentiating Steno- cercus prionotiis from S. caducus in south- " I am uncertain how Fugler (1983, 1986, 1989) distinguished Boh\dan specimens he referred to Sten- ocercus aculeatus and S. caducus. In 1983 and 1986 he refer
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