Well Pizza Marinara is essentially a Pizza Margherita, without the cheese and the sauce has a number of spices added to it.

Besides that, most pasta dishes specify the sauce/special things in/on it. Like "al sugo" usually means plain or "marinara" as we call it in the US, "sugo" meaning sauce, "marinara" often in Italy does mean seafood stuff but you'll also often see "al mare."

Essentially "marinara" means plain sauce in the US. I've never seen it used otherwise unless in a stuffier or more authentic Italian restaurant, if that.

Anyhow, I hope people try my friends' recipes. I know I use them religiously.