Stenoperla prasina (Māori: ngarongaro waicode: mri promoted to code: mi )[4] is a species of stonefly belonging to the family Eustheniidae.

This species inhabits clean, cold, running streams and rivers with stony bottoms within native bush.

This species was described by Edward Newman in 1845 using a specimen obtained by Mr Saunders and named Chloroperla prasina.

The prothorax is flat, rather narrower than the head; its transverse diameter slightly the greatest, its anterior margin nearly straight, posterior rounded, colour green.

[5]The distinguishing feature of this insect in its nymph stage is the presence of a hair fringe on the dorsal side of the distal segments of the cerci.

[9] As this feature is not always present in early instars this can cause issues when attempting to identify this species in its nymph stage.

[9][11] The larvae of this species is commonly found in cold running streams with stony bottoms in native bush.

[14] Further research is needed to judge the importance of sooty moulds as a food source for S. prasina and also whether it plays a role as a vector assisting honeydew to be eaten by S.

[1] The presence of nymphs of this species in streams and rivers indicates that the water and habitat is of good quality.