The Seri are loosely organised in a number of exogamic, matrilineal, totemic clans.
If a group is exogamic, the women in it were born abroad somewhere.
Yet Mr. Spencer remarks that 'the development of exogamic groups' gradually resulted from some organisation of unknown nature.
The Arunta 'exogamic groups' are 'classes,' and 'phratries,' the totem does not now regulate marriage among the Arunta.
Lang adds that these taboos are the basis of exogamic practices.
It is upon this complex situation of the woman that the exogamic restrictions depend.
But exogamic groups can regulate marital arrangements in one way only—that is, by introducing exogamy.
exogamy ex·og·a·my (ěk-sŏg'ə-mē)
Sexual reproduction by means of conjugation of two gametes of different ancestry, as in certain protozoan species.