Fireworm

Lanthanodrax speleotraxis.¹ (Also the occasionally occuring "sport" or hypotrophic subspecies, L. speleotraxis ignigastris.)

The fireworm is possibly a candidate for the single North American species which has had the most interference by wizardry in its evolution. The original species was repeatedly mutated by the wizards caught up in the events surrounding the final fate of Afallonë...

¹The taxonomy of the western European fireworm is somewhat confused. The Bestiarium Ignotum classified the fireworm as Lanthanotrops micrognotus, but this did not take into account the internal differences between the Lanthanotrops and Lanthanodrax families -- possibly understandable, since Linnaeus was unable to find a dead specimen to dissect, and trapping a live one was at that point out of the question. The Materia Magica's classification group has now placed the fireworm among the various members of family Hemerothalcus, with the "true dragons" of the Lanthanodrax and Draco species.