Elliptical galaxies Look like ellipses from every angle, though the size of the ellipse you see will depend on the angle. Elliptical galaxies don't have disks , in general. Exceptions are caused by galaxies that have merged together. Looks very similar to the spheroidal component of a spiral galaxy. Ellipticals are mostly found in clusters.
Many smaller galaxies are elliptical.
Called either dwarf ellipticals or dwarf spheroidals. Less than a billion stars, keep finding smaller ones. Usually found near large spiral galaxies, further confusing things. Irregular galaxies Anything that's neither an elliptical nor a spiral will get lumped into the irregular galaxy category. Includes galaxies disrupted by interactions or mergers with other galaxies, and ones that formed that way.