Pediculus humanus, human head louse
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Pediculus humanus, human head louse
Scanning electron microscope image of a human head louse (x 60). These external parasites use their hook-like claws to grip the hair
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Media ID 8605865
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Arthropod Arthropoda Bark Lice Bark Louse Barklice Barklouse Claw Electron Micrograph Hexapod Hexapoda Hominini Homo Homo Sapiens Human Insecta Lice Louse Micrograph Microscope Image Parasite Head Louse Invertebrata
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This striking scanning electron microscope image provides an up-close view of Pediculus humanus, the common human head louse. As invertebrate arthropods belonging to the order Phthiraptera and the family Pediculidae, head lice are external parasites that rely on humans as their primary host. The image reveals the intricate details of the louse's anatomy, with its six legs (hexapod) clearly visible. The most notable feature of the human head louse is its claws, which are adapted for gripping human hair. The claws, located at the end of each leg, are hook-like in shape and enable the louse to cling tightly to the hair shaft, making it difficult for the host to remove. The louse's body is covered in tiny hairs, or setae, which help it move along the hair. Despite their small size, head lice are a significant health concern for humans, particularly in communities where close contact is frequent. Infestations can lead to itching, discomfort, and even secondary bacterial infections. The lice feed on human blood and can cause anemia, especially in young children. The human head louse has a complex life cycle, with three stages: the egg (nit), the nymph, and the adult. The eggs are laid at the base of the hair shaft and are glued in place by a substance secreted by the female louse. The nymphs hatch after approximately seven days and undergo several molts before reaching adulthood. Adult lice can live for up to 30 days and lay up to 100 eggs during their lifetime. This micrograph offers a fascinating glimpse into the world of these tiny, yet impactful, arthropods. It serves as a reminder of the intricate relationships that exist between humans and the invertebrates that share our environment.
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