Question: what are the different types of dwarf galaxy?
Answer: Elliptical galaxy: dwarf elliptical galaxy (dE)
Dwarf spheroidal galaxy (dSph): Once a subtype of dwarf ellipticals, now regarded as a distinct type.
Irregular galaxy: dwarf irregular galaxy (dIrr)
Spiral galaxy: dwarf spiral galaxy (dS)
Magellanic type dwarfs.
Blue compact dwarf galaxies (see section below)