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What is a Micro Moth and...

Why aren't they all called Moths irregardless of size? Is there a size limit or something? I've seen the term used here on BG and I thought I'd ask.

Thanks in advance!

One possibility
If it is not used simply to refer to size, it may refer to the division into "microlepidoptera" and "macrolepidoptera." The original moths, c. 60 million years ago, were small. A few more recently evolved lines, such as butterflies and geometrid moths, are large.

At least one, and possibly both, of these groups are not so-called "natural groups", meaning they do not include a common ancestor and all its descendants. (For example, "moths" in common vernacular do not form a natural group because butterflies are one small interior branch of the moth family tree. On the other hand, both dragonflies and damselflies are natural groups -- neither is a subgroup of the other.)

 
Thanks John...
For the explanation.

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