. Biology of the Heteromyidae. Heteromyidae. C. Humerus Length-Body Weight. D. Tail Length-Basil ar Skull Length D'' D -003X'^°^ DD ^ 2 .p X ' .083 X' 50 p Fig. 14. —Four allometric patterns in the body proportions of 14 heteromyid species based on log- transformed means of adult measurements. The exponent of the power function is the slope of the nearest line. The x-axis scale is log (body weight'A) in A-C and log (basilar skull length) for D. A, Conservatism: basilar skull length; B, Elongation (in dipodomyines): hindlimb length (=femur -(- tibia lengths); C, Reduction (in Dipod
. Biology of the Heteromyidae. Heteromyidae. C. Humerus Length-Body Weight. D. Tail Length-Basil ar Skull Length D'' D -003X'^°^ DD ^ 2 .p X ' .083 X' 50 p Fig. 14. —Four allometric patterns in the body proportions of 14 heteromyid species based on log- transformed means of adult measurements. The exponent of the power function is the slope of the nearest line. The x-axis scale is log (body weight'A) in A-C and log (basilar skull length) for D. A, Conservatism: basilar skull length; B, Elongation (in dipodomyines): hindlimb length (=femur -(- tibia lengths); C, Reduction (in Dipodomys): humerus length; D, Tail length: The two regression lines shown represent one possible interpretation. An alternative is that P. longimembhs and M. megacephalus are allometrically related to P. parvus and heteromyines. Both assume that P. merhami and D. spectabilis are outliers (from Brylski, 1985). Taxonomic abbreviations, with congeners listed in as- cending size along X-axis: C: Chaetodipus formosus, C. baileyi; D: Dipodomys merhami, D. agilis, D. panamintinus, D. deserti, D. spectabilis; M: M. megacephalus; P: Perognathus merriami, P. lon- gimembris, P. parvus; H: Heteromys desmarestianus; Hg, H. gaumeri (only in D)\ Li, L. irroratus; Ls, L. salvini. ing captive heteromyids. In the absence of such data, we can turn to interspecific com- parisons because correlated evolutionary changes among body parts are a necessary, but not sufficient, condition of the hypoth- esis that they share a common growth reg- ulating mechanism. Interspecific compari- sons reveal that the list of correlated skeletal features does not include the auditory bullae and tail. This is because all perognathines, the sister group to dipodomyines, possess moderately inflated bullae and some have elongated tails, yet all lack elongated hind- limbs. Thus, phylogenetic changes in the au- ditory bullae and tail are independent of one another and of phylogenetic changes in the femur, tibia, and pes. Th
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