What is "clytoctantes"

Clytoctantes is a South American genus of bird in the family Thamnophilidae. Males are grey or black and females are mainly rufous. The stubby, hefty bill has a distinctly upcurved lower mandible and a straight culmen (a large version of the bills of the recurvebills), which possibly is a modification for opening bamboo stems in their search for insects. The two species were feared to be extinct or nearly so, until both were rediscovered in 2004.