The Airbus A321 is the workhorse of Turkish Airlines' short haul operation, with almost one hundred in the fleet.  There are currently five configurations including the newest A321neo type.

A321ceo
Type 321, configured 194CM
Type 32B, configured 20C 158M
Type 32M, configured 20C 158M formerly operated by Kingfisher Airlines
Type 32R, configured 16C 164M

A321neo
Type 32Q, configured 20C 162M