Brovold (Alabama), Caizares (Arizona State), Davies (East Tennessee State), Maybin (South Alabama), Norn (Oklahoma State) and Rominger (South Carolina) compete collegiately in the United States.
Norway, Italy and Switzerland will be represented for the first time in the Palmer Cup.
Caizares and Castao competed in the 2003 Palmer Cup. The Spaniards were playing partners in the four-ball and foursomes matches with each earning a 3-1 record to lead Europe to a 14-10 victory.
Coaches will be Swedens Magnus Grankvist and Graham Kaye of Switzerland.
The Palmer Cup will be played August 6-7 at Ballybunion Golf Club in County Kerry, Ireland. The U.S. leads the Palmer Cup series, 4-2-1.