Platyhelminthes Flashcards
1
Q
Classes
A
- Turbellaria: Planaria
- Cestoda: Tapeworms
- Trematoda: Flukes
2
Q
Turbellaria:
* Ecological interaction
* Respiration/exretion
* Reproduction
A
- Environment: Free-living
- Respiration/exretion: Through the mouth
- Reproduction: Sexual and asexual
3
Q
Turbellaria: Reproduction
A
- Asexual: Transverse fission
- Sexual: Monoecious
4
Q
Cestoda: Ecological interaction
A
Parasitic
5
Q
Cestoda: Form
A
- Scolex
- Strobila
- Proglottids
6
Q
Scolex
Cestoda Form
A
For attachment to host
7
Q
Strobila
Cestoda Form
A
Main body composed of a chain of proglottids
8
Q
Proglottid
Cestoday Form
A
Complete hermaphroditic reproductive units
9
Q
Cestoda: Reproduction
A
Sexual & Asexual:
10
Q
Cestoda: Sexual reproduction
A
- Nearly all monoecious
- Shelled embryos form in the uterus of the proglottid
- Strobilation: Formation of new proglottids behind scolex
11
Q
Cestoda Asexual Reproduction
A
- Binary fission: Irregular, longitudinal, and transverse fission
- Multiple fission
12
Q
Trematoda: Ecological interaction
A
Parasitic - endoparasites of vertebrats
13
Q
Definitive host
A
- Birds
- Sexual stage
14
Q
Intermediate host
A
- Snails
- Asexual stage
15
Q
Trematoda life cycle
A
- Eggs are passed in faeces
- Eggs hatch & liberate miracidia
- Parasite develops in snail
- Cercariae penetrate skin of birds & migrate to blood to complete cycle
16
Q
Miracidia
A
free-swimming, ciliated larvae of trematoda
17
Q
Cercariae
A
Tadpole-like juveniles of trematoda
18
Q
Swimmer’s itch
A
Occurs when cercariae enter the skin of humans
