Improved Natural attack Feat question

[Nemitri]

Improved Natural Attack (Monster)

Attacks made by one of this creature's natural attacks leave vicious wounds.

Prerequisite: Natural weapon, base attack bonus +4.

Benefit: Choose one of the creature's natural attack forms (not an unarmed strike). The damage for this natural attack increases by one step on the following list, as if the creature's size had increased by one category. Damage dice increase as follows: 1d2, 1d3, 1d4, 1d6, 1d8, 2d6, 3d6, 4d6, 6d6, 8d6, 12d6.

A weapon or attack that deals 1d10 points of damage increases as follows: 1d10, 2d8, 3d8, 4d8, 6d8, 8d8, 12d8.

Special: This feat can be taken multiple times. Each time it is taken, it applies to a different natural attack.

Question, if for example I choose claws, do I get the dmg increase to one claw or both? how about creatures (or humanoids with tentacles and the like, do they count as 1 or as separate?)

[concerro]

Even if a creature has more than one claw, tentacle, and so on any weapon specific feats will apply to all of them.

[Grick]

Nemitri wrote:

if for example I choose claws, do I get the dmg increase to one claw or both? how about creatures (or humanoids with tentacles and the like, do they count as 1 or as separate?)

"Benefit: Choose one of the creature's natural attack forms"

[Din_]

Just wondering, how does this interact with a summoner's Eidolon evolution Improved Damage?

evo wrote:

Improved Damage (Ex)

One of the eidolon’s natural attacks is particularly deadly. Select one natural attack form and increase the damage die type by one step. This evolution can be selected more than once. Its effects do not stack. Each time an eidolon selects this evolution, it applies to a different natural attack

If an Eidolon had, say, 6 claws, what would happen if you chose Improved Damage(Claws) and Improved Natural Attack(Claws)?

Does it only apply to 2 of the claws or all of them?

[Jorda75]

I'm pretty sure it would affect them all, just as someone with two swords gets the benefits from feats and abilities that increase damage with that type of weapon. Many monsters have more than 2 claw attacks and I'm quite certain their damage is always uniform (assuming they're all primary or secondary attacks, ect).

[Din_]

I just noticed the damage dice increase listed for Improved Natural Attack is different than those listed in the Natural Attacks table, found here.

The progression according to the linked table is 1d2,1d3,1d4,1d6,1d8,2d6,2d8,4d6,(unlisted).

I can't seem to find the specific place where it was mentioned, but I remember something about the unlisted portion being twice of something two sizes smaller, meaning it would continue as 4d8,8d6,8d8,etc.

Which one is correct, since there is a clear difference between the two damage steps in written form. The Improved Natural Attack feat claims to increase the dice by one size category, but it does not seem to follow it.