Cannot locate ArduinoMEGA 2560 in serial port menu

I am using a macbook pro running OSX Yosemite and i have downloaded all the suggested serail port drivers. Still i cannot see any suggestion that my arduino board is being read. WHen opening the port menu i cannot see anything like /dev/tty.usbmodem241, i can only see bluetooth.
any help would save me a tonne.
Cheers

UPDATE: It shows up in my system information as USB2.0-Serial:
How can i make it so it shows up in arduino

Seems you have a clone... Look at the chip that is closest to the USB port, it will most likely be either a CP2102 or a CH340. Getting the correct drivers for the chip on your board should enable you to communicate with it.

Good luck, let me know if you need any help.