User blog comment:Da Clorax/proposed relations between even more dragon species, and my logic and reasoning behind it/@comment-26797272-20180530054400

I honestly disagree that Snaptrappers are closely related to deadly nadders. Chances are their similarities are the result of convergent evolution (when 2 unrelated organisms evolve similar features, a good example of this is how pterodactyl *Note: using the genus Pterodactylus as a name to classify the entire Pterosauria group is inaccurate* mouths resemble bird beaks, even though pterosaurs evolved independatly from non-avian/avian dinosaurs)

Many of the similarities between the dragons in the franchise could mean that said dragons are probably in the same clade/family, or, as I've stated above, evolved these similarities as a result of convergent evolution.

I like to believe that Terrible Terrors are dragons that evolved to retain their neotenic (dragon-baby) traits into adulthood, hence their rather baby-like appearance and small size.