Which descriptor is listed for Saturniidae as 'small heads, hairy'?

Which descriptor is listed for Saturniidae as 'small heads, hairy'?

• A. Large (3-15 cm)
• B. Small heads, hairy
• C. Dark eyespots, hair like scales
• D. Antennae bipectinate or feathery

Answer: (B)

In insect identification, field keys use concise, observable traits to group like insects. For Saturniidae, a defining cue is that they have small heads and a hairy appearance. The small head stands out when you compare the overall proportions of the moth, and the dense body hair (setae) gives a distinctly fuzzy look. This combination is a helpful diagnostic line in keys and guides and is the descriptor that matches the listed phrase exactly. Size can vary and isn’t unique to Saturniidae, so labeling them as simply large isn’t as diagnostic. Wing patterns like dark eyespots or scales, or antennae type such as bipectinate or feathery, provide useful information but are not the exact descriptor referenced here.

In insect identification, field keys use concise, observable traits to group like insects. For Saturniidae, a defining cue is that they have small heads and a hairy appearance. The small head stands out when you compare the overall proportions of the moth, and the dense body hair (setae) gives a distinctly fuzzy look. This combination is a helpful diagnostic line in keys and guides and is the descriptor that matches the listed phrase exactly.

Size can vary and isn’t unique to Saturniidae, so labeling them as simply large isn’t as diagnostic. Wing patterns like dark eyespots or scales, or antennae type such as bipectinate or feathery, provide useful information but are not the exact descriptor referenced here.