Navel Piranha could attack by using its little claw hand things. It would follow Mario's Y position before it shoots up after an amount of time.
The claw thing is the picture below:
I would redo the entire mock-up picture, but it's four separate pictures put together, so it'll take awhile to do it.
Also, here is a list of all the enemies. No pictures, but the names and their descriptions. Maybe it'll help?
http://www.smbhq.com/char3.htm#smw
Maybe you could make a Tap-tap afterward (Actually it's a request). I don't have a picture right now.