Benthic macroinvertebrates include Phylum Platyhelminthes, Nematomorpha, Mollusca, Annelida, and Arthropoda. Arthropoda is the most abundant in species, with over 70% of the benthic macroinvertebrate species. Among Arthropoda, aquatic insects such as the Mayfly and Dragonfly are most abundant.

 The benthic macroinvertebrates living in freshwater include 7 phyla, 13 classes, 37 orders, 146 families, 749 species. 95 species are endemic to the Korean Peninsula. The Cockscomb Pearl Mussel, Knobbed Triton, Pseudohelice quadrata, and Lamprotula coreana are designated as Endangered Wildlife Class I. 31 species are designated as Class II, including the Orange Cup Coral.