Which of the following describes Chironomidae?

• A. 2-30 mm long
• B. Red, White, Olive, or Yellowish
• C. Well developed, sclerotized head with eyes
• D. All of the above

Answer: (D)

Chironomidae are a highly variable group of non-biting midges, and a lot of how they look is defined by size, color, and head structure. The size range from about 2 to 30 millimeters covers many species and life stages, so describing them as having that length span fits the group. Color is also variable across species and life stages, with appearances ranging from red, white, olive, to yellowish. This diversity in coloration is common in chironomids, including the red-tlood hemolymph seen in some larvae. Finally, the head is clearly defined and sclerotized with visible eyes, a characteristic feature you’ll encounter across these flies, even though adults often have reduced mouthparts. Put together, these traits collectively describe Chironomidae, so all of these statements apply.