Which Lepidoptera family has caterpillars with seven pairs of prolegs?

Which Lepidoptera family has caterpillars with seven pairs of prolegs?

• A. Nymphalidae
• B. Sphingidae
• C. Megalopygidae
• D. Saturniidae

Answer: (C)

Caterpillar movement and identification often hinge on the number and placement of prolegs, the fleshy, leg-like extensions on the abdomen. Most Lepidoptera caterpillars have five pairs of prolegs (on abdominal segments 3–6 and the last segment), and this pattern is a common baseline in many groups. The seven-pair proleg arrangement is a distinctive trait of Megalopygidae, setting these caterpillars apart from the other families listed. Because of this unusual count, Megalopygidae caterpillars can be identified by having more prolegs than the typical five, which is why this family is the best match. The other families usually do not exhibit seven prolegs, so they don’t fit this specific characteristic.

Caterpillar movement and identification often hinge on the number and placement of prolegs, the fleshy, leg-like extensions on the abdomen. Most Lepidoptera caterpillars have five pairs of prolegs (on abdominal segments 3–6 and the last segment), and this pattern is a common baseline in many groups. The seven-pair proleg arrangement is a distinctive trait of Megalopygidae, setting these caterpillars apart from the other families listed. Because of this unusual count, Megalopygidae caterpillars can be identified by having more prolegs than the typical five, which is why this family is the best match. The other families usually do not exhibit seven prolegs, so they don’t fit this specific characteristic.