. Bulletin. Science; Natural history; Natural history. / \ Figure 4. Ventral view of the interclavicle (id), sternum (str), xiphistemum (xip) and fragmented postxiphisternum (fpxip) of the genus Bacliia. turization of the elements. Length and width of the individual elements are greatly reduced over the condition exhibited by closely related genera (, Heterodactyliis, Colobosaura. and Colohod- actylus). Bachia dorbignyi has reduced the metacarpals and wrist elements to 2 or 3 with the loss of the fifth phalange. Bachia intermedia, and peruana exhibit reduction to three sets of phalange ele
. Bulletin. Science; Natural history; Natural history. / \ Figure 4. Ventral view of the interclavicle (id), sternum (str), xiphistemum (xip) and fragmented postxiphisternum (fpxip) of the genus Bacliia. turization of the elements. Length and width of the individual elements are greatly reduced over the condition exhibited by closely related genera (, Heterodactyliis, Colobosaura. and Colohod- actylus). Bachia dorbignyi has reduced the metacarpals and wrist elements to 2 or 3 with the loss of the fifth phalange. Bachia intermedia, and peruana exhibit reduction to three sets of phalange ele- ments externally, but B. intermedia retains the fourth phalangeal element subcutaneously. Only two carpal elements are present. Bachia bicolor, barhoiiri, and trisanale exhibit reduction and loss of phalanges, the carpal elements articulating dis- tally with one or two elongated metacarpals. monodactylus retains a greatly reduced humerus, ulna-radial complex, one or two carpal elements, and four metacarpal Figure 5. Lateral view of the pectoral elements of the genus Bacliia (cla-clavicle; scap-scapula; cor- coracoid: gf-glenoid fossa). Hindlimb and Girdle.—The hindlimb in the least reduced state consists of a femur, tibia, a very slender fibula, two ankle elements, and several fused metatarsals which articulate with three or four sets of phalangeal elements (Fig. 7A). The number of external toes exhibited is highly vari- able in Bachia heteropa. Depending on the sub- species (Dixon, 1973), there may be 4, 3 or 2 toes visible externally. Internally, beneath the skin, four phalanges are present but may show reduction in size corresponding to the external condition. This difference in number of toes on the external hind- limb appears to be correlated with the occurrence of species in drier, sandy soil types. The hindlimb is reduced in Bachia dorbignyi to three elements, arranged in linear fashion from the pelvic girdle distally. The elements are a femur, tib
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