Murex (conch like ones) aggro to JA only. Thunder and Wind based. Murex seem quite squishy and take normal damage from spells. They are BLMs and will cast -ga III with what seemed to be fast cast when I had 4 aggro me. Their TP move is conal damage but seemed fairly weak, ~200.
Amoeba (Floating things) don't aggro JA or sight, I've heard they aggro magic but no proof myself. Earth and Dark based, mainly DRK type mobs but I've seen a Eph. Dark one cast sleepga II. Don't fight Eph. Earth based ones with melees, serously don't >.> they have a TP move which does AoE drain for ~500 and resets all JA timers including 2hr.

Mini worms are adorable.

