Looks like rigatoni to me but apparently it's different in the way it is shaped. Not sure if this shot really makes any great use of negative space but, here it is, such as it is.
Yes, I think it does- but instead of the typical large block of it, your negative space encircles the pasta. It's there, but just not as obvious and it balances out the subject nicely.
Great shapes and textures, Joanne! I haven't been following the negative space challenge, but I agree with Ann ("your negative space encircles the pasta")