Annelida Flashcards
1
Q
what species belong to annelida
A
segmented worms
2
Q
where do annelida live
A
marine, freshwater, terrestrial
3
Q
how do they eat
A
suspension feeders, predators, parasites and detritrovors
4
Q
what are the three groups of annelida
A
- polychaete
- oligochaete
- hirudinea
5
Q
many polychaete have Chaete, what is this?
A
lots of hairs on their bodies
6
Q
what is the polychaete body plan like?
A
- metamere structures are confined to trunk
- head has specialised sense organs
- chitinous jaw
- have fleshy appendages that extend from body facilitating movement/ locomotion
7
Q
what is the brain like in polychaete?
A
- lies in the prostomum
- rapid contraction to avoid predetors aided by giant axons
8
Q
what are the sense organs of polychaetes like
A
- pigment cup eyes: detects light intensity
- nuchal organs: chemoreceptors
- statocytes: detect change in orientation
9
Q
what is reproduction in polychaete like
A
- asexual reproduction
- no permanent sex organs
- fertilisation is external
10
Q
what species belong to the oligochaete group
A
earth worms
11
Q
oligochates reproduction
A
- mutual sperm transfer
- clitellum secretes mucus coat to hold worm in position- also secretes chitin material to form cocoon for fertilisation
12
Q
what is the locomotion of oligochates like
A
- longitudinal and circular muscles
- waves of contraction pass down length of body causing elongation and shortening in each segment
- they burrow
- reduced sense organs
13
Q
what species are in hirudinea group
A
leeches
14
Q
what is the feeding style of leeches
A
predetors
15
Q
where are the suckers on a leech
A
on the anterior and posterior end
