Monstera deliciosa is actually not a philodendron at all, but has casually fallen into the "philodendron" category over time. It takes a lot of searching to find the answer online, because "split leaf" and "monstera" have been used interchangeably for so many years.
Regarding my plant, I was trying to buy a monstera, but I won't be too disappointed if it turns out not to be one. I just liked the plant itself. Maybe because I already have a veriegated monstera that I am sure is such, because I bought it as a cutting from the giant parent plant, which grew about 25' in the greenhouse! Right now it only has 4 original leaves, just waiting for it to take off.
Cheryl- does your split leaf reach outwards, not upwards?