• Head appears attached to thorax
• Body divided into 6 major sections, the first including the fused head, thorax, and first abdominal segment
• Each division with a median, ventral suctorial disc

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