Official Data Edit
According to this guidebook, Reos, as well as Himellas and Mellas, are part of the same species:
"A flying bug-type creature. Besides the Reos that appear in Sector 1, there are Himella with ice attacks in Sector 2, and Mellas with fire attacks in Sector 3, making three different types of Reo."
- While not present in the game, Mellows are possibly another species related to Himellas and Mellas, given their similarities in name and body structures (which feature small to no visible limbs).
- The Japanese name for Himella is ヒムラ (himura), making Himella a mistranslation.