Just edit the PlanetGeneratorDefinition.sbc file and add the lines above to any planet. Look up the Alien Planet for the spiders.

please how can i add wildlife to other planets?
i mean, im triying to edit a map with some lore in mind, and i need a extremely foggy planet with lots of trees, and a shit ton of spiders. i managed to reach that lines of code you have there, and the triton files too, yet i still lack the knowledge to copy another planet of the game, or even some of the workshop, wich are perfect but lack the spiders