The intermediate host of the dipetalonema reconditum can be one of two things: fleas or lice. This particular worm has a similar lifestyle and look to the heartworm, so it is often thought to be a heartworm when it gets to its final host: dogs and foxes. The dipetalonema reconditum doesn’t infect the bloodstream, like the heartworm. Instead, they dig under the skin and just stay there.
They typically go under the dermis or epidermis - possibly both. Unfortunately for dogs and foxes, these worms are found throughout the entire US. These worms don’t usually cause a problem for the dog or fox that the worm is living in, though. Because of this, these infections don’t typically need to be treated.