Gnath mount(speculation)

[Rocl]

Dragonflies, if I recall, are not sentient. (Actually I'm always unsure how this word is used in these discussions) Dragonflies are in the same hierachy as drakes, biasts, archaeosaurs etc within the Dravanian Horde iirc. They are living, breathing creatures bent to a dragon's will.

Likewise, we have a couple sentient mounts (wyvern, Midgardsormr, Maggie[?]), so I don't think this would bar a creature from being mount-fodder.

We should also take note of a few things that happened with previous Beast Tribe mounts:
Drakes were pretty prevalent in Thanalan and the Amalj'aa camps. That one's a pretty nice fit. Pretty sure Amalj'aa riding Drakes has been canon for a long time.
Goobbues are absolutely nowhere in the Shroud, nor was there any indication of Sylphs and Goobbue relation. (In fact, Goobbues were strictly La Noscean in 1.0 as far as I can recall)
Bombs have likewise always been pretty close with Kobolds, though their classification as voidsent always vexed me. However, before the palanquin reveal, I don't think anyone was banking on a bomb mount. (Hell, I thought an oversized coblyn or golem was more likely)
Elbsts were found absolutely nowhere in the wild before being added to Sapsa sometime after 2.0's release. If I'm remembering rightly, and I think I am, they were pretty unique to Pharos Sirius before Sahagin Beast Tribe quests.
Wolves, like the other 2 main 1.0 beast faction pets, have been pretty solidly associated with their beast tribe. However, like bombs, it seemed very unlikely given their diminutive stature.

the tl;dr is basically Square Enix can do whatever they want for mounts (see: flying adamantoise and Fenrir); applying lore to things like what should and shouldn't be a minion/mount is dangerous business (I appreciate the irony in saying this on a lore forum)