Claterna cydonia 
Claudicula Joker 
Claudina crescent 
Clavate Tortoise Beetle 
Clavate Tortoise Beetle 
Clay Bumble Bee 
Clay-colored Leaf Beetle 
Clear Cleaner Shrimp 
Clear Dagger Moth 
Clear-winged forest glory 
Clear-winged Grasshopper 
Clearspot Bluewing 
Clearwing Mimic-White 
Clearwing-mimic Queen 
Clemens bark moth 
Clemens' Agonopterix 
Clemens' clepsis moth 
Clemens' Grass Tubeworm Moth 
Clemens' Philonome Moth 
Cleora alienaria 
Cleora compectinata 
Cleora determinata 
Cleora hospita 
Cleora illustraria