What's the story on the logo of Clotho?

[Sapphic]

Well, didn't one of the Heavensturms tell us that horses are uncommon/unheard of in Eorzia? And Ishgard is home of the chocobos. It seems more likely that it would be a unicorn, which are native to Eorzia, then a horse, which isn't.

Unicorn's are just horny horses! :P

Are they anything to do with the relevant guild? As it is from them you get the original ilvl 55 ones.

[Niwashi]

Yeah they told us Horses don't exist in Eorzea.

Well, if unicorns can be depicted in the heraldry of countries where they don't exist but horses do, then I suppose horses could be depicted in the heraldry of countries where they don't exist but unicorns do.

you can see what a Unicorn symbol looks like here:
...
Ears + Horn

Well, a properly drawn unicorn should have both ears and horn visible, but either a horse or unicorn, when drawn in a rampant pose, should also have forelegs visible. And those rear legs really look like they end in paws rather than hooves (particularly on the leg that's raised in front). Whatever this is, it's drawn pretty weird.

[myahele]

I' m probably grasping at straws here, but Clotho (the spinner) is one of the 3 sisters of fate ans is responsible for spinning the thread of people's life. Likewise, weaver's patron deity is nymea goddess of fate. So both are closely associated with weaving....though I'm unsure if they have any associations with horses in their myths

[Kaiser-Ace]

I don't know, I forget which of the Twelve Nymia is. I remember Oscon, Thalik, Nald'thal, Halone, Rahlger, and Althyc. The other six I forget.

[Shadygrove]

Well, a properly drawn unicorn should have both ears and horn visible, but either a horse or unicorn, when drawn in a rampant pose, should also have forelegs visible. And those rear legs really look like they end in paws rather than hooves (particularly on the leg that's raised in front). Whatever this is, it's drawn pretty weird.

A couple of minor corrections. Only carnivores ramp. Same pose has a different name, that I forget, for herbivores.

But they aren't ramping anyway. They are supporting.

[Kirol]

Ullikummi's logo looks like the "Unnamed Class" that was in Owl's Nest in 1.0.

Oh you mean this one?
Sure, it's quite similar, but ... not entirely the same. Not close enough to be the same, by my reasoning.