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Many lice are specific to a single species of host and have co-evolved with it. In some cases, they live on only a particular part of the body. Some animals are known to host up to fifteen different species, although one to three is typical for mammals, and two to six for birds. Lice generally cannot survive for long if removed from their host. [5]
Head lice are wingless insects that spend their entire lives on the human scalp and feed exclusively on human blood. [1] Humans are the only known hosts of this specific parasite, while chimpanzees and bonobos host a closely related species, Pediculus schaeffi. Other species of lice infest most orders of mammals and all orders of birds.
Psocodea contains around 11,000 species, divided among four suborders and more than 70 families. [1] [2] [8] They range in size from 1–10 millimetres (0.04–0.4 in) in length. The species known as booklice received their common name because they are commonly found amongst old books—they feed upon the paste used in binding.
Genera and species within the family Menoponidae are identified by their short antennae, concealed in grooves behind the eyes. [4] To the untrained eye, it may appear as though they have no antennae. [4] Most lice also further specialize to specific regions on their hosts such as the fluff at the base of the tail, the head, and the shaft. [5]
Most species of whale louse are associated with a single species of whale. They remain with their host throughout their development and do not experience a free-swimming phase. [ 1 ] Although the relationship between a specific species of whale louse and a specific species of whale is more pronounced with baleen whales than with toothed whales ...
Sea lice (singular: sea louse) are copepods (small crustaceans) of the family Caligidae within the order Siphonostomatoida. They are marine ectoparasites (external parasites) that feed on the mucus, epidermal tissue, and blood of host fish. The roughly 559 species in 37 genera include around 162 Lepeophtheirus and 268 Caligus species.
Most adult species are light tan to brown in color and are usually 1–4 mm in length, although some livestock species can grow to be 5–7 mm, and some wild bird species can even get to 10 mm. [2] Mallophaga are often adapted to live on a specific part of their host and typically spend their entire lives on a single host.
Lice in this family have a chaetotaxy characterized by three kinds of setae: spines, scales, and hairs. Different species have different arrangements of these setae. Species also have various egg-laying habits, with some laying them singly or in clusters, and some cementing them to the hairs of the host animal. [2] These lice have antennae but ...