. Biology of New World Microtus. Rodents; Rodents; Microtus; Voles. y 7h' zya pop. Fig. 2. Ventral view of cranium of male Microtus (Stenocranius) miurus, Alaska. For abbreviations, see Fig. 1. cannot be assigned. As a result, systematists have relied upon cranial dimensions (Howell, 1924), ratios compounded therefrom (Ander- son, 1959), or suture closure and ridge development (Choate and Williams, 1978; Klimkiewicz, 1970; Snyder, 1954) in their recog- nition of age classes. Snyder (1954) and Anderson (1959) construct- ed ratio diagrams of several cranial variables to portray the amount of age
. Biology of New World Microtus. Rodents; Rodents; Microtus; Voles. y 7h' zya pop. Fig. 2. Ventral view of cranium of male Microtus (Stenocranius) miurus, Alaska. For abbreviations, see Fig. 1. cannot be assigned. As a result, systematists have relied upon cranial dimensions (Howell, 1924), ratios compounded therefrom (Ander- son, 1959), or suture closure and ridge development (Choate and Williams, 1978; Klimkiewicz, 1970; Snyder, 1954) in their recog- nition of age classes. Snyder (1954) and Anderson (1959) construct- ed ratio diagrams of several cranial variables to portray the amount of age-related change and to identify w^hich variables most quickly attain "adult" dimensions. Cranial breadth, prelambdoidal breadth, height of skull, and interorbital vs^idth undergo relatively little mod- ification with age, while rostral, condylobasilar, and alveolobasilar length and zygomatic breadth change dramatically. Gebczynska. 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 Tamarin, Robert H; American Society of Mammalogists. [Stillwater, Okla. ] : American Society of Mammalogists ; Shippensburg, Pa. : distributed by Vertebrate Museum, Shippensburg University
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectrodents
