• First seven abdominal segments with only one pair of ventral prolegs
• Most abdominal segments have one or two slender tubercles
• Apical tubercles on the terminal segment largest
• No posterior spiracles
• No striations or covering of pubescence

Merritt, R W., K W. Cummins, and M B. Berg. An Introduction to the Aquatic Insects of North America. Dubuque, Iowa: Kendall/Hunt Company, 2008