Final answer:
Callitrichines, like marmosets and tamarins, have a typical mating system of monogamy, where one male and one female form a pair bond for at least one breeding season. They can also have a polyandrous mating system, where one female mates with multiple males.
Step-by-step explanation:
Callitrichines, which includes marmosets and tamarins, have a variety of mating systems. The typical mating system for callitrichines is monogamy, where one male and one female form a pair bond for at least one breeding season. This monogamous mating system is seen in many bird populations as well, where the male helps provide parental care for the offspring. Additionally, callitrichines have been observed to have polyandrous mating systems, where one female mates with multiple males. This is a rarer mating system in callitrichines, but it allows the female to provide eggs to several males without the burden of carrying the fertilized eggs.