Sucking Lice Order Anoplura

Identification: Small (usually less than 4 mm.), flattened, wingless ectoparasites of mammals. Mouth parts sucking, withdrawn into head when not in use; when used, everted through a short beaklike structure at front of head. Antennae short, threadlike or tapering distally, 3- to 5-segmented. Head small, nearly always narrower than thorax. Without ocelli and with compound eyes small or absent. Tarsi 1-segmented, with 1 large claw. Cerci lacking. Metamorphosis simple.

Similar orders: Mallophaga (p. 106): mouth parts chewing; head usually as wide as or wider than thorax; 1 or 2 small tarsal claws; parasites of birds and mammals. Immature stages: Similar to adult stage.

Habits: Sucking lice feed on the blood of their host, and their bites are often very irritating. Each species usually attacks one or a few related species of hosts, and generally lives on a particular part of the host's body. Eggs are usually attached to hairs of the host; eggs of the Body Louse are laid on clothing. Sucking lice spend their entire life on their host, and do not survive long away from the host.

Importance: These lice are irritating pests of man and animals, and 1 of the species that attacks man is an important disease vector. Classification: Three families, separated chiefly by body shape and the development of compound eyes; these characters are best seen in specimens mounted on microscope slides. No. of species: World, 250; N. America, 62.

SPINY SUCKING LICE Family Echinophthiriidae Not illus. Identification: Body thickly covered with short stout spines or with spines and scales. Parasites of marine mammals.

The members of this small group attack seals, sea lions, and walruses.

MAMMAL SUCKING LICE Family Haematopinidae Identification: Eyes lacking. Parasites of various mammals (but not man or other primates).

This is a large group, and includes most of the sucking lice that attack mammals other than man. Some species are pests of domestic animals.

HUMAN LICE Family Pediculidae

Identification: Eyes or eye tubercles present. Parasites of man. This group contains 2 species, Phthirus pubis (Linn.), the Crab

0 0

Post a comment