. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. Figure 6. Suggested area of origin (stippled) and later dispersals (arrows) in geckos. Map data as in Figure 3. Dates at end of arrows represent earliest known pre-Pleistocene fossils of the group in that area. Possible Bering route to North America for Eocene geckos shown in dotted line, see text. Note vicariance of gekkonid subgroups in Southeast Asia, Australia, and India. Only major paths shown; island or rafting dispersal routes not inclu
. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. Figure 6. Suggested area of origin (stippled) and later dispersals (arrows) in geckos. Map data as in Figure 3. Dates at end of arrows represent earliest known pre-Pleistocene fossils of the group in that area. Possible Bering route to North America for Eocene geckos shown in dotted line, see text. Note vicariance of gekkonid subgroups in Southeast Asia, Australia, and India. Only major paths shown; island or rafting dispersal routes not included. See text for further explanation. regular dorsal head scales. Dibamids (in- cluding anelytropsids) seem to be related to the gekkotans (Underwood, 1971) and while they also lack a fossil record, again point to an originally Laurasian deploy- ment of the Gekkota. Scincomorpha. While the iguanoids were radiating in western Gondwana, scincomorphs were diversifying in Laurasia, as shown by the presence of cordyloids and perhaps scincoids in the Late Jurassic of Europe. Definitive lacertoids (the most primitive of scinc- omorphs) are not known at this time, al- though the presence of the more ad- vanced cordyloid group indicates that lacertoids must have already evolved, and ancestral lacertoids may have split off from a common ancestor with iguan- ians in Eurasia (Fig. 7). Meyasaurus and Ilaerdesaurus from the Late Jurassic of Spain, and Durotrigia from the Late Jurassic of England, may represent early lacertoids (Fig. 3). The unity of living lacertoids seems to be demonstrated by a number of derived character states (Hoffstetter, 1962; Riep- pel, 1980c; Estes, 1982; Gauthier, in preparation), although Presch (1981, personal communication) believes lacer- tids and teiids to be widely separated. Presch also allies the gymnophthalmids with the lacertids, but teiids and gymno- phthalmids share derived character states of the hemipenial musculature (N. Arnold, 1982, personal commu
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Keywords: ., bookauthorharvarduniver, bookcentury1900, booksubjectherpetology
