Merimnetria multiformis is a moth of the Gelechiidae family. It is endemic to Oahu and possibly Hawaii. The larvae feed on Gouldia coriacea and Gouldia macrocarpa. They mine the leaves of their host plant. Very small young plants can be completely defoliated. The mine is at first slender and serpentine. As the larva becomes nearly full-grown, it eats out the whole parenchyma of the leaf and sometimes eats down through the petiole of the leaf to the stem, and sometimes also migrates to another leaf. It emerges from the leaf to form its cocoon on the surface of a leaf, or other suitable situation.