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

Dentition of the Northern Elephant Seal

Kenneth T. Briggs
Journal of Mammalogy
Vol. 55, No. 1 (Feb., 1974), pp. 158-171
DOI: 10.2307/1379264
Stable URL: http://www.jstor.org/stable/1379264
Page Count: 14
  • 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
Dentition of the Northern Elephant Seal
Preview not available

Abstract

The milk and permanent dentitions from 61 northern elephant seals (Mirounga angustirostris) were analyzed to reveal tooth morphology, postcanine formulae, and eruption sequence of the permanent teeth. By studying large numbers of pups, morphology of the milk teeth was elucidated and three morphological types of permanent postcanines were distinguished. The first permanent lower premolar is frequently deleted, corresponding to exaggerated permanent canine development. Asymmetry in the permanent postcanine formula is common (63 per cent of individuals exhibit asymmetry) with the most frequent anomalies being deletion of lower premolar 1 and presence of a second molar in the lower jaw. There are suggestions that the dentition of northern elephant seals (M. angustirostris) differs from that of southern elephant seals (M. leonina) in several aspects, including frequencies of occurrences of the first upper molar and lower premolar 1, eruption sequence of permanent teeth, and degree of confluence of the alveoli of fourth premolars and first molars.

Page Thumbnails

  • Thumbnail: Page 
158
    158
  • Thumbnail: Page 
159
    159
  • Thumbnail: Page 
160
    160
  • Thumbnail: Page 
161
    161
  • Thumbnail: Page 
162
    162
  • Thumbnail: Page 
163
    163
  • Thumbnail: Page 
164
    164
  • Thumbnail: Page 
165
    165
  • Thumbnail: Page 
166
    166
  • Thumbnail: Page 
167
    167
  • Thumbnail: Page 
168
    168
  • Thumbnail: Page 
169
    169
  • Thumbnail: Page 
170
    170
  • Thumbnail: Page 
171
    171