A dead goat is presented to a veterinarian in the Caribbean.

The farmer reports that the goat hadn’t been eating well yesterday, then this morning was breathing hard and walking with a strange high-stepping gait.
She eventually went down and started paddling with her head twisted back just before death.

Necropsy reveals the following finding (blue arrow) adjacent to the heart:
He is worried about his other goats.

What vector is responsible for transmitting the infectious agent most likely responsible for this goat’s condition?