PLATYHELMINTHES Flashcards
1
Q
HABITAT
A
- Mostly endoparasitic i.e live inside the body of the host and few are free-living like planaria or dugesia
2
Q
General characteristics:
- Body organization
- Body symmetry
- Germ layer
- Coelom
- appearance of mouth or anus
- metameric segmentation (exception)
- body plan
A
- Organ level body organization
- Bilateral symmetry
- Triplobalstic
- acoelomate
- protostomate
- unsegmented except tapeworm which is pseudo segmented
- Blind sac
body wall/tegument are cuticular enzyme resistant
3
Q
RESPIRATORY SYSTEM
- Respiratory organ
- Pigment
A
- Body surface
2. pigment is absent
4
Q
CIRCULATORY SYSTEM
- Type of circulation
- organ
A
- Gastrovascular system
2. no organ is present
5
Q
EXCRETORY SYSTEM
- Organ
- Waste
A
- Flame cell \ protonephridia (nephron absent GLOMARULUS & BOWMAN’S CAPSULE Present)
- Ammonlelic
6
Q
DIGESTIVE SYSTEM
A
incomplete digestion except for tapeworm which has a complete alimentary canal
7
Q
Function of mouth
A
The mouth has dual functions
- in free living: ingestion and egestion
- parasite: mouth having hooks and suckers
through this structure worms attack themselves with the host body
8
Q
Digestion
A
Digestion is extracellular
9
Q
Skeleton
A
Hydro- skeleton (true skeleton is absent)
10
Q
nervous system
A
Ladder like a neural system
11
Q
Reproductive system
- Type of reproductive body
- Maturity of sex organ
A
- Monoecious (having both female and male reproductive organs)
except for Shistoma - protoandrous (male matures first)
12
Q
Type of reproduction
A
usually sexual
except for planaria and dugasia (both sexual and asexual )
13
Q
fertilization
development
A
internal, cross, and self
indirect
14
Q
Example
A
planaria/dugasia
taenia
fasciola : liver fluke
schistosoma: blood fluke
