Summary
Summary interaction between parasites and their hosts.
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Parasitology is the study of the interaction between parasites and their hosts.
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ORDER PHTHIRAPTERA [lice]SUBORDER ANOPLURA/SIPHUNCULATA
[sucking lice]
The eggs are referred to as nits.
➢ Infestation is called pediculosis
Paratergal plate - Abdomen bears dark brown or
black areas of thickened chitin at the sides.
Haematopinidae [short-nosed louse]
➢ Largest species of lice
➢ Head is sharp and has a prominent
forward prolongation [temporal angles]
➢ Tibial pad- which can be thrust up to lock
the grip on the hair
➢ Haematopinus tuberculatus, the buffalo
louse, is the largest species of the genus
occurring on ruminants, measuring 5.5
mm.
➢ Haematopinidae lice infest cattle and
can cause economic losses by reducing
weight gain and milk production.
Haematopinus asini
➢ Resembles H.suis but its paratergal
plates are small and tuberculate
Family Linognathidae [long-nosed louse]
➢ These are the smallest species of
sucking lice.
➢ Linognathidae lice infest dogs and can
cause hair loss, skin irritation, and
anemia.
Family Pediculidae
➢ Parasitic to man and primates
➢ Pigmented eyes are present.
➢ Abdominal segments bear paratergal
plates
➢ Pediculus humanus capitis– human
head louse
➢ Pediculus humanus corporis – human
body louse [note that the legs are of equal
size and
➢ the claws are slender]
➢ Phthirus pubis– pubic louse or crab louse Pediculidae lice infest humans and can cause intense
itching, scalp irritation, and body lice can transmit
bacterial diseases such as epidemic typhus, trench
fever, and relapsing fever to humans.
Exercise No. 9 Common chewing lice:
MALLOPHAGA (Biting lice) ➢ Dog – Trichodectes canis
In general ➢ Cat – Felicola subrostatus
➢ Small wingless insects with dorsoventrally ➢ Cattle – Damalinia bovis
flattened bodies ➢ Poultry – Goniocotes gallinae
Suborders:
, ➢ Permanent ectoparasite of birds and 1. Amblycera
mammals 2. Ischnocera
➢ They are smaller than sucking lice 3. Rhynchophthirina
(Anoplura)
➢ Large round head – wider than widest part The two main species on dogs are:
of the thorax ➢ Trichodectes canis (dog chewing louse)
➢ Antennae – short [3-5 segments] ➢ Linognathus setosus
➢ Eyes are vestigial There is only one species on cats:
➢ Segmentation of the thorax is indistinct ➢ Felicola subrostratus
Suborder Ischnocera
➢ Antennae are filiform and visible at the
sides of the head [3-5 segments]
➢ No maxillary pulp
➢ Mandibles bite vertically
1. Illustrate Damalinia sp. and Damalinia equi
label the body parts.
Felicola substratus – Chewing louse
Lipeurus caponis [wing louse]
➢ Occurs in the under-side of the large
wing feathers
Chelopistes meleagridis
[common louse of the turkey]
Columbicola columbae – pigeon louse
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