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No, there are other families such as the Blathereen. Also, Blon Fel-Fotch Passameer-Day Slitheen in her human disguise mentions a species called the Venom Grubs in the episode "Boom Town".

If you mean the species Raxacoricofallapatorians when you say Slitheen, then no, there is other fauna, including Baaraddelskelliumfatrexius Beasts and Rakweed. There is also flora, such as the Poppito tree. However, no sentient species besides Raxacoricofallapatorians are known to live there.