If you need an accessible version of this item please contact JSTOR User Support

Age Variation in Phenacomys

J. Bristol Foster and Randolph L. Peterson
Journal of Mammalogy
Vol. 42, No. 1 (Feb., 1961), pp. 44-53
DOI: 10.2307/1377239
Stable URL: http://www.jstor.org/stable/1377239
Page Count: 10
  • Download PDF
  • Cite this Item

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support
Age Variation in Phenacomys
Preview not available

Abstract

Attempts were made to ascertain the age of a wild-caught Phenacomys ungava, within rather close limits, by comparing its skull with those of a series of known-age phenacomys. Such comparisons are not valid, since the laboratory voles do not develop exactly as do those in the wild. Rather, one may only comment that great care must be taken when comparing laboratory data with data gathered under natural conditions. It is demonstrated that the rostrum of phenacomys continues to grow throughout the first year of its life and that this may be used in approximating its age more closely than has been hitherto possible. Degree of extension of teeth is also quite useful in calculating age.

Page Thumbnails

  • Thumbnail: Page 
44
    44
  • Thumbnail: Page 
45
    45
  • Thumbnail: Page 
46
    46
  • Thumbnail: Page 
47
    47
  • Thumbnail: Page 
48
    48
  • Thumbnail: Page 
49
    49
  • Thumbnail: Page 
50
    50
  • Thumbnail: Page 
51
    51
  • Thumbnail: Page 
52
    52
  • Thumbnail: Page 
53
    53