Perhaps it can be called a rudimentary op amp. I can't say what is its overall performance.
The leftmost section is a differential amplifier.
The right half creates a simple output stage. The feedback loop consists of a series capacitor.
I imagine your question about biasing applies to the Nmos pair which I circled below? I find other schematics attaching additional circuitry to that bias wire. Right now it appears to have an undefined volt level.
It's called basic two stage OP in literature. As stated by Brad, biasing of the green encircled current source transistors has been omitted in the schematic.