Blue circles: Example of Metriocnemus knabi midge larvae. The midge larvae can be distinguished from the mosquito larvae because they lack a clear difference between head and tail ends and are more gradually tapered at both ends.

Green circles: Examples of Wyeomyia smithii mosquito larvae, which can be found in various sizes and thus various stages of development. They have a distinct squarish segment just behind a more triangular head. Other distinct features are their protuding hairs and tapered tails, as well as jerky swim movements that are not observed with midge larvae. 

Yellow circle: Example of pupa of Wyeomyia smithii. This is the non-feeding stage directly before it transforms into an adult (also designated as the 5th instar). It usually is not counted as an active member of the predator-prey dynamics since it is not feeding on bacteria. It can be distinguished by its curled, shorter tail and darker elliptical head structure (larger than heads of larvae).