How to decide a species owing a reference genome or without a reference genome?
For eukaryotes, RNA-seq with or without reference genome is applied to different analysis workflow. Generally, Ensembl(http://asia.ensembl.org/index.html) and NCBI(http://www.ncbi.nlm.nih.gov/) are recommended for checking the reference genome of a species. But there are also some special databases for specific species such as CuGenDB, JGI, GDR etc.