Unilateral ovarian absence in a Black‐headed Squirrel Monkey (Saimiri vanzolinii Ayres, 1985), a threatened neotropical primate species

Ovarian agenesis is an unusual anomaly with traumatic or congenital origin. In the present case report, we describe our findings in a senile S.vanzolinii female. As this neotropical primate species is listed as vulnerable, with limited geographic distribution in the Brazilian Amazonia, ovarian agenesis may be an important finding to be reported.