Catulla (also spelt Catualla, and known indigenously as Cendo-Prae) was the sixth planet in the Theta Pictoris star system, the homeworld of the Catullan civilization and was a member of the United Federation of Planets since 2185. (ST reference: Star Charts)
Catulla was similar in mass to Earth and had two moons; Milon and Milar. By the mid-24th century the Catullan population numbered 9.5 million and had built a huge industrial network covering the planet. The continent of Tesakar was home to the Harrell Hullworks, one of the Federation's leading manufacturers of warp-capable spacecraft hulls. Harrell also maintained a construction facility in geosynchronous orbit directly above its planet-side facilities.
In their distant history the Catullans fought a massive nuclear war which wiped out their knowledge and culture. They struggled for centuries to rebuild their civilization. (ST reference: The Worlds of the Federation)
Catulla applied for Federation membership in 2269. Negotiations were at a critical stage on stardate 5832.3 when the USS Enterprise apprehended the stolen starship Aurora, whose passengers included Tongo Rad, son of Catullan ambassador Tongo Sil. (ST references: Encyclopedia, The Worlds of the Federation; TOS episode: "The Way to Eden")
In the late-2360s Kuri Dennings and her brother Tosh went on a fishing holiday on Catualla. Their refrigeration unit malfunctioned causing their catch to freeze into blocks of lumpy grey ice they called ichtysicles. (DS9 - Avatar novel: Book One)
Catulla appears to be the slightly more common spelling of the name of the planet, Catualla was used in the Star Trek Encyclopedia and DS9 novel: Avatar. The native name, Cendo-Prae, has only been used in The Worlds of the Federation