あんぐり is defined as such:

> adverb / noun or verb acting prenominally: open-mouthed
>
> 大学の門の前に真っ赤なフェラーリが停めてあるのを見て、アングリした。 I saw a bright red Ferrari parked at the
> campus gates and my jaw just dropped.

I am confused by seeing it in examples such as the following:

> あんぐりと口を開けて
>
> あんぐりと口もひらき

These examples seem redundant but why are they not? What information am I
lacking that would distinguish あんぐり from 口を開けて? In English, the expression
"with mouth agape," means to have one's mouth open in astonishment or
surprise. It would seem to be a similar expression to あんぐり. To me the quoted
examples seem redundant in meaning, but are they communicating two different
things to those fluent in Japanese? Is there etymological information to the
word あんぐり that would change my understanding of it? Can あんぐり mean "in
astonishment/in amazement" without referring to the mouth?

In the quoted example below, it is especially the も that is throwing me off.
What extra meaning does it give the sentence? Is this も an adverb meaning
"more / further"? After giving it further thought, I came up with these
interpretations below. Do they make sense?

あんぐりと口もひらき = "He gaped in astonishment, his mouth widening even more..." Or
maybe a better translation is : " With jaw-dropping astonishment, his mouth
widened even more..."

Original example:

> 幸夫の横で、あんぐりと口もひらき、逃げようともせず、ただぼんやりしている叔父にしても、 今、眼の前に起こっていることが信じられないにちがいなかった。
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2012-12-06T01:03:25.067
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Can anyone provide a detailed definition of あんぐり and say if the expression あんぐりと口を開けて is redundant?
If you just open your mouth (口を開ける), it could be to talk, or to put food in,
etc. If your mouth is agape (あんぐりと口を開ける), your mouth is open wide in
surprise/astonishment. In English there isn't an equivalent adverb that comes
to mind, I think "gaped in astonishment" works; 'gaped' for the sense of
'opened wide', plus 'astonishment'.

The も here I don't think is indicating "opened further" or the extent of the
opening. You sometimes see this to indicate 'as well as something we haven't
mentioned...', basically giving an example which isn't exclusive. In this
case, for example, his eyes might also have widened in astonishment.

This sense of も is described in the dictionary 大辞泉 as:

> ある事柄を挙げ、同様の事柄が他にある意を表す (to raise an example of one thing, expressing the
> feeling that similar things exist)
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answer