Italicization can vary according to house styles, but normally, the titles of books of any sort, plays, operas and the like, art exhibitions, newspapers, magazines, academic journals, brochures and pamphlets, newsletters, films, and TV or radio series should all be set in italic. So are the names of vessels like ships and other watercraft, aircraft, spacecraft, and trains. The names of long (well, very long) poems get set in italic, but not shorter ones. Taxonomic names of genus, species, and if available, subspecies are all set in italic, but not the names of family or higher, which are only capitalized. Species and subspecies are not even capitalized, but anything higher is.