Fireworm (Species)

The Fireworm dragon is like cockroach of the dragon world... if a cockroach could superheat its skin to burn everything it touched. Usually Fireworms make their homes in dark caverns.

Appearance
Fireworms are about half the size of Terrible Terrors. They have dark gray scales with red skin underneath, or gray skin that turns red when heated; however it seems in Riders of Berk, they have orangish-brown scales. They also have five sets of legs, making in total, ten legs. They have a somewhat large wingspan in comparison to their bodies, and eyes that glow in the dark. But in the Cartoon Network website, the Fireworms have no wings at all. Maybe this is because the images in the Cartoon Network website are just concept arts instead of the final version of the image. They resemble lizards, with their wide heads and long bodies. When they heat, they glow white-red, and sometimes light on fire. They belong to the Stoker Class.

Riders of Berk
When searching for the fabled Hamish Treasure, Hiccup, Astrid, Snotlout, Fishlegs, Ruffnut, Tuffnut, and the dragons find themselves trapped in a cave. While searching for a way out, they find a large, dark opening. Entering, they realize that the "ground" is moving. Toothless lights the room, and they find thousands of little Fireworms bustling about in a shallow pit. Hiccup warns his friends of the danger, stating that their white-hot skin "burns with the heat of the sun." They find multiple pedestals in the heart of their nest, and the dragons try to frighten/fight the smaller reptiles off until the kids can find a way out. Later, when Hiccup plummets down the hole, a few Fireworms fall with him.

Trivia

 * Though they had already been discovered by vVkings, as Hiccup was easily able to identify them, nothing is known of the Fireworms (i.e. speed, firepower, and shot limit (which is most likely 0 as they do not breathe fire)).
 * Strangely, the Fireworms in the episode Portrait of Hiccup as a Buff Man differ enormously from the ones in the images at Cartoon Network, suggesting that there are two varieties of Fireworm.