Irrealism is a catch-all term UCSD's lit dept. (at least) uses to describe fantasy, sci-fi, and similar pieces of writing.
right now i'm re-reading the Dune Chronicles. i realized i was having trouble remembering the books over the movies. i also like Ursula Le Guin and Octavia E. Butler a lot, but i read quite a bit. Kathy Acker and Julio Cortazar are two of my other favorites, and i recently finished Blindness by Jose Saramago.
I also have to say that I'm tremendously skeptical about writers who haven't demonstrated the ability to produce short fiction before going on to longer works. That may, or may not have anything to do with you, however.
and i never said i haven't written short pieces. one of my current projects is an anthology of short character studies. i just haven't written much sci-fi. people write for different reasons. i always had an attraction to writing, but i never invested myself in it until i'd almost finished my major (sociology, emphasis on social psychology). i was strongly drawn to theory, but i found that it was so abstract i didn't know what i meant on a concrete level. writing is one way i explore that.