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[Pelion]

However, the Muon is less stable than an electron (which is fundamental and therefore completely stable)...

But Muons are also fundamental particles (and electrons are not always completely stable)

[MadMojoMonkey]

But Muons are also fundamental particles (and electrons are not always completely stable)

Excellent catch, what a screw-up on my part.

... working on where I got that notion, and what the best description is...

EDIT: I had it in my head that a Muon was a Meson, or 2-quark structure. It was once called a Mu meson, but later found to be a lepton. So that's why I thought it was unstable... but even that much is a brain fart, apparently. It is true that Muons and Tauons are both fundamental particles and unstable.

They are called fundamental particles because when their structure is probed, it shows no internal pieces. It can still decay because QM is tricky as anything and so long as conservation laws are maintained, anything can change into anything else.