TOS: Doctor's Orders
has the Lahit and Ornae of Flyspeck (1212 Muscae IV) seek admission to the Federation. Starfleet wanted them as members badly. The treaty signed on behalf of the Federation (by Kirk), the ;At, Lahit and Ornae used "Flyspeck" as the official designation of the planet (seriously).
The novel may still be part of the modern continuity because a Lahit appears as Starfleet CMO in The Poisoned Chalice
. Also, the novel only contradicts the established continuity by stating no planets with more than one sentient species has been found by the lat 2260s.