Rebecca Bross of Plano and Ivana Hong of Allen both train at the World Olympic Gymnastics Academy alongside Olympic champ Nastia Liukin. Liukin withdrew her name from consideration for the team in August, saying she needed more time to get in shape.
Olympic silver medalist and current U.S. all-around champion Bridget Sloan headlines the women's team.
Sloan, of Pittsboro, Ind., won her first U.S. all-around title, as well as the uneven bars and floor exercise, at the national championships in August. She was a member of the squad that won silver at the 2008 Beijing Olympics.
Kayla Williams of Nitro, W. Va., also was chosen for the team announced on Sunday.
The alternates are Kytra Hunter of Frederick, Md., and Mackenzie Caquatto, Naperville, Ill.
Chosen earlier for the U.S. men's team were Olympic medalist Jonathan Horton, of Houston, who took silver on the high bar and bronze in the team competition in Beijing; Jake Dalton, Sparks, Nev.; Wes Haagensen, Colorado Springs, Colo.; Steven Legendre, Flower Mound; Danell Leyva, Miami, Fla.; and Tim McNeill, Falls Church, Va.
The world championships run from Oct. 13-18. The format features all-around and individual event competition.