Aquamarine Swarmite

While it's not exactly common, the representatives of the Severed Threads assure you that swarmites are more than capable of carrying your weight if you choose to ride it.

Riding Requirements:

This mount is available to all eligible characters on your account.
Level 10
Apprentice Riding (ground)
Expert Riding (flying)

Source:

Lady Vinazian in Weaver's Lair, Azj-Kahet. Requires Renown Rank 23 with The Severed Threads.
Cost: 3940 (reputation discounts apply for some factions)

Notes:

This teal swarmite may be purchased upon reaching Renown Rank 23 with The Severed Threads. For more information, see Wowhead's Severed Threads Renown Guide. The Kej required to buy this mount can be earned by completing activities in Azj-Kahet.