Phylum Nematoda Flashcards
(18 cards)
1
Q
Common name?
A
Round worms (round in cross section)
2
Q
Pro or Deu?
A
protostomes
3
Q
Skin layers?
A
triploblastic: pseudocoelomate
4
Q
Digestive Tract & Feeding?
A
- complete digestive tract
- fluid feeders, some are parasites & some predators
5
Q
Respiratory System
A
no specialized respiratory structures – aren’t needed
6
Q
Excretion:
What are renettes?
A
- they line the outside and draw metabolic waste products out of pseudocoelom
7
Q
Skeleton?
A
hydrostatic skeleton
8
Q
Symmetry?
A
bilateral symmetry w/ cephalization
9
Q
Level of organization
A
organ-system
10
Q
Nervous System
A
anterior nerve ring w/ posterior & anterior nerves (stick out differently, no ganglia)
11
Q
Circulatory system
A
- no circulatory system
- not needed
- diffusion is strong enough for transport of nutrients
12
Q
Where are they found?
A
- terrestrial, marine, and freshwater, internal parasites
- invaded a lot, shows success
- found in pond water
13
Q
What kind of senses and how well-developed?
A
- strong chemoreception but not really well-developed other sense
- perceive chemicals in environment, maybe by smelling
- don’t need other senses really
14
Q
Monoecious or dioecious?
A
Dioecious
15
Q
Are they dimorphic?
What is the difference btn males & females?
A
- dimorphic – can tell difference btn boys & girls
- boys – smaller & have curved tip
- girls – larger & have straight tip
16
Q
They are eutely.
What does this mean?
A
- organism whose cell counts are conserved, # of cells in each species same across species
17
Q
Do they have to molt to grow?
A
Yes.
- “Ecdysozoa”: molt in order to grow, i.e. roundworm will take off cuticle when it’s time to grow
18
Q
Life Cycle of Ascaris lumbricoides
A
30% of ppl infected
- How to break it:
- don’t poop in water
- wash hands
