What parasite was identified on a feral kitten during examination when observing large white eggs on its hair?

The identification of large white eggs on the hair of a feral kitten points to Felicola, commonly known as cat lice. Felicola is a specific type of ectoparasite that lays its eggs, or nits, on the fur of cats. These eggs are often visible to the naked eye and are typically white or yellowish in color.

In contrast, other parasites listed do not produce such noticeable eggs directly on the fur. Otodectes cynotis, known as ear mites, primarily inhabit the ear canal, and their eggs are not typically observed externally on the fur. Ctenocephalides felis refers to the common cat flea, which lays eggs that tend to fall off the host into the environment rather than being seen attached to the fur itself. Dermacenter variabilis, also known as the American dog tick, does not produce visible eggs on the host's fur in the same manner as lice do, as ticks require a much different life cycle and reproductive strategy.

Thus, the presence of those large white eggs on the kitten’s hair strongly indicates an infestation of Felicola.