Which family is characterized by a fore leg with two claws, a tarsus separated from the tibia, a profemur not broadly triangular, and a pronotum at the base of the head as wide as the eyes?

Which family is characterized by a fore leg with two claws, a tarsus separated from the tibia, a profemur not broadly triangular, and a pronotum at the base of the head as wide as the eyes?

• A. Gerridae
• B. Gelastocoridae
• C. Cimicidae
• D. Miridae

Answer: (B)

Insect families are often distinguished by how the legs and the thorax relate to feeding and how the head meets the thorax. The combination described—front leg built for grabbing prey with two claws, a clearly separated tarsus from the tibia, a front femur that isn’t a broad, triangular blade, and a pronotum at the base of the head that is as wide as the eyes—points to a group known for a stout, predatory foreleg and a distinctive head-thorax shape: the toad bugs. Gelastocoridae use their strong front legs to seize prey, and their pronotum forms a broad silhouette at the back of the head, giving that wide look at the base of the head relative to the eyes. This set of traits is characteristic for identifying them in keys, setting them apart from the other families listed, which lack this combination of grasping forelegs and the pronounced head–pronotum relationship.

Insect families are often distinguished by how the legs and the thorax relate to feeding and how the head meets the thorax. The combination described—front leg built for grabbing prey with two claws, a clearly separated tarsus from the tibia, a front femur that isn’t a broad, triangular blade, and a pronotum at the base of the head that is as wide as the eyes—points to a group known for a stout, predatory foreleg and a distinctive head-thorax shape: the toad bugs. Gelastocoridae use their strong front legs to seize prey, and their pronotum forms a broad silhouette at the back of the head, giving that wide look at the base of the head relative to the eyes. This set of traits is characteristic for identifying them in keys, setting them apart from the other families listed, which lack this combination of grasping forelegs and the pronounced head–pronotum relationship.