Who's missing?

[coalescent]

[Poll #1046886]

Actual answer here. Vote before you click.

EDIT: See also jlassen's two entries, and Andrew Wheeler here.

FURTHER EDIT: Commentary from rosefox here and cristalia here.

Comments

[white_hart]

Well, it either means they've been around for 20 years or that you or lslaw has discussed them at length and made them sound interesting...