'Sons of Anarchy' Villain Adam Arkin -- Wife Files for Divorce

"Sons of Anarchy" villain Adam Arkin's wife has slammed the brakes on their marriage after nearly 15 years, TMZ has learned.

Phyllis Lyons filed the divorce docs in L.A. County Superior Court, citing irreconcilable differences.

It was a very recent split -- the couple was married in 1998 and just separated on Monday. They have one 8-year-old son.

The property settlement is still up in the air, but Phyllis wants to block the court from awarding Adam spousal support. Adam's rep had no comment.

Fun fact: Adam is the son of Oscar-winning actor Alan Arkin from "Argo" and "Little Miss Sunshine."