Hydraena angulicollis is a Wisconsin Special Concern minute moss beetle occurs statewide. It is found in in moss or accumulations of moist/wet dead leaves and sticks/twigs along the margins of streams, rivers, sinkholes, pools, and ponds along with within small streams and other slow velocity habitats and littoral zone substrates. Both larvae and adults graze on wet stones, sand grains, and plant matter where they feed on algae, bacteria, protozoans, and detritus. As its name implies, it is a very small beetle.
