I think the 'long and pointyness' is due to the distortion through the glass of the tank.
It could be a common but as smithrc says, the colouration doesn't look quite right.
We need a better picture!
im not the best expert on plecos... but, the one that are tagged "commen pleco" are normally all black.... and some are lik 1 1/2 feet long...i thin u got a sub-species