This horned little devil is the mesocercaria of the trematode, Alaria marcianae, which has a very unusual life cycle. When the metacercariae of this species are ingested by a lactating carnivore such as a Florida panther, they migrate to the tissues instead of developing in their normal site, the small intestine, and develop to this stage. They can then be passed in the milk to the kittens, where they develop normally in the intestine to the adult stage. Females can continue to transmit mesocercariae to future litters until exhausted of their infections.
Contributed by Mike Kinsella.