Which family is described as having tarsi with three segments on all legs (3-3-3)?

Which family is described as having tarsi with three segments on all legs (3-3-3)?

• A. Psocoptera (Book/Bark Lice)
• B. Gryllotalpidae (Mole Crickets)
• C. Notonectidae (Backswimmers)
• D. Gryllidae (Crickets)

Answer: (B)

Understanding tarsal segmentation helps in identifying insect families. The tarsus is the last part of the leg, made of small segments called tarsomeres, and many groups show different counts of these segments on different legs. The family Gryllotalpidae, the mole crickets, has three-segmented tarsi on every leg—fore, middle, and hind—which creates a consistent 3-3-3 pattern across all legs. This uniform tarsal formula is a reliable trait used in keys to recognize mole crickets. The other groups listed do not share this exact across-the-board 3-3-3 tarsal pattern, so they don’t fit the description as neatly.

Understanding tarsal segmentation helps in identifying insect families. The tarsus is the last part of the leg, made of small segments called tarsomeres, and many groups show different counts of these segments on different legs. The family Gryllotalpidae, the mole crickets, has three-segmented tarsi on every leg—fore, middle, and hind—which creates a consistent 3-3-3 pattern across all legs. This uniform tarsal formula is a reliable trait used in keys to recognize mole crickets. The other groups listed do not share this exact across-the-board 3-3-3 tarsal pattern, so they don’t fit the description as neatly.