Luteostriata subtilis is a species of land planarian belonging to the subfamily Geoplaninae.

Luteostriata subtilis has an elongate body with parallel margins, reaching up to 62 mm in length.

The head region is an orange color that fades into the light yellow of the rest of the body.

Below, rather than above, the opening of the ejaculatory duct, a large fold in the male atrium distinguishes the species from others in the genus.

[2] The specific epithet of L. subtilis is derived from the Latin word subtilis (fine, slender, precise), in reference to the species' subtle, thin stripes on the dorsum, as well as the very subtle internal differences between it and L.