Which Texas-based studio developed the Metroid Prime trilogy?

The Texas-based studio that developed the Metroid Prime trilogy is Retro Studios.

Retro Studios is an American developer headquartered in Austin, Texas. Nintendo granted the studio the Metroid license during the GameCube era, leading to Metroid Prime, released in North America in 2002.

Retro then developed Metroid Prime 2: Echoes for GameCube in 2004 and Metroid Prime 3: Corruption for Wii in 2007. Together, those three games form the original Metroid Prime trilogy. Retro also created the 2009 Wii compilation Metroid Prime: Trilogy, which updated the first two games with Wii controls and packaged all three entries together.

The trilogy is a first-person interpretation of Metroid's exploration, scanning, platforming, and environmental storytelling. It is distinct from Metroid Prime Hunters, which was developed by Nintendo Software Technology, although Retro helped guide its artistic direction. MercurySteam, another frequent answer in Metroid quizzes, instead worked on Samus Returns and Dread.