You are correct Alelover. Canneloni is smooth and has square ends. Mannicotti (regate') has angled ends. Rigate' means ridges in Italian. I work in a pasta plant where these things are made.I love Manicotti and I love Giada. Great post. I usually will make stuffed shells. I find them easier to fill. I did manicotti before and tore up half the tubes. I'm better with shells. I always thought the cannelloni had straight ends and the manicotti had angled ends and ribs (regate').