The scientific name you see there is not actually referring to the snail, but to the parasitic flatworm that has infected both its eyestalks. The snail would normally look like this:
Snails become infected when they eat bird droppings with the flatworm’s eggs in them. The eggs hatch and the larvae travel up the snail’s digestive tract until they reach their eyestalks and transform into their sporocyst stage, engorging the snail’s eyestalks and making them pulsate with different colors as seen above.
Not only that, but the flatworms damage the snail’s ability to detect light, so that it wanders out of safe darker spaces into more dangerous open areas. (Interestingly, the parasite itself seems to be able to detect light, because the pulsating does not occur in complete darkness!)
The reason for all this, of course, is to make the eyestalks appear like delicious insect larvae to passing birds, which eat the snails, allowing the parasite to complete the last stages of its life within them. The bird excretes the eggs in its poop, the snail eats the poop, and the cycle begins anew…