Which type of bug is commonly known for feeding on human blood and is part of the Hemiptera order?

The type of bug that is commonly known for feeding on human blood and is classified within the Hemiptera order is the bed bug. These insects are particularly notorious for their nocturnal feeding habits, where they bite exposed skin of sleeping humans to draw blood. Bed bugs possess specialized mouthparts, allowing them to pierce the skin and consume blood.

In addition to being part of the Hemiptera order, which includes other true bugs that typically have a beak-like structure for feeding, bed bugs are unique due to their strong association with human dwellings and their ability to reproduce rapidly in these environments. Their resilience and ability to go long periods without feeding further highlight their adaptability and make them a significant concern for pest control.

The other choices do not fit the criteria. Fleas are also blood feeders, but they belong to the order Siphonaptera. Crab lice, while blood-feeding ectoparasites, are categorized as an insect but do not fall under the Hemiptera order. Dust mites are not blood feeders at all; rather, they feed on skin flakes and are classified in the arachnid class, not within the insect order. Hence, bed bugs are the definitive answer that aligns with both the dietary behavior of feeding on