Chapter 4 page 7 Flashcards
Morphological features of Class Insecta
- Head, thorax, abdomen
- 3 unbranched legs (thorax)
- 1 pair of antennae
- 2 pairs wings
- 2 pairs of maxillae on head
- Mouthparts
- Gut has digestive caeca
- Genital opening
**Pediculus humanus and the triatomine bugs that transmit
Chagas disease**
- Advanced insect orders undergo_____in which an egg hatches to release a larva that looks nothing like its parent and frequently has different diet and occupies a different ecological niche. **
holometabolous development
**Ex. of insects that undergo holometabolous development include the
human flea Pulex irritans and the flies such as mosquitoes, tsetse flies, and blowflies. Insects do not moult again once they become adult and acquire their wings**.
Order Phthiraptera (lice):
**Is divided into 2 suborders:
- Mallophaga( biting lice)
- Anoplura (sucking lice)**
All ectoparasitic:
on birds and mammals
Mallophaga
- triangular-shaped heads (broader)
- thorax
- biting mouthparts. Chews on feathers, fur, or dander. Bovicola bovis
Anoplura
- narrower thorax
- sucking mouthpart to penetrate skin and consume blood
Pediculus humanus capitis
human head
Pediculus humanus humanus
human body louse
Both species (pediculus humans capitis, pediculus humanus humanus) are
Cosmopolitan parasites of humans
*The head louse(lice) lay eggs singly upon
scalp hairs and are referred to as ‘nits.’ **
Head lice don’t lay eggs of clothes and other material possessions such as
earphones and hats.
Adult head lice and body lice: don’t live on the host for more than 48 hours.
Lice is transmitted by
contact
Head lice and body lice feed
several times a day and causes irritation and inflammation.
