Dictionary of Human Evolution and Biology

  • -id > 9:3

I1, I2, I3, Etc.

Notation that makes reference to incisor teeth in which the most medial tooth is the lowest number and the lateral tooth is the highest number. The notation is either lower case (indicating a mandibular tooth) or upper case (indicating a maxillary tooth). There are two ways in which this is used:

1. in reference to retention or absence of a tooth from the primitive eutherian mammalian set of teeth, the dental formula of which is: Incisors have been lost, in which case the existing teeth may have incisors designated by a number larger than the number of actual teeth; primates with incisal reduction are considered to have lost I3, so this is not an issue when referring to this order.

2. in reference to the teeth that are present in an existing species. The medialmost incisor is I1, regardless of the ancestral condition.

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