Phylum Annelida Flashcards
What is the common name?
Segmented worms
Pro or Deut?
protostome
How many skin layers?
triploblastic: coelomate
Digestion
complete digestive tract
Respiration:
Do they have specialized structures?
What kind of respiration do they use?
- no specialized respiratory structures
-
cutaneous respiration – use skin for gas exchange
- like to stay in moist conditions
- don’t like sunlight b/c will dry them out
Water Control
Photonephridia or Metanophridia
Skeleton
Hydrostatic skeleton
Symmetry
Bilateral symmetry w/ cephalization
Level of Organization
organ systems
Nervous System
ganglia + ventral nerve cord
What kind of circulatory system?
closed circulatory system w/ aortic arches
Have metamerism.
What is it and what are the advantages of having it?
- serial repetition of body parts
- injury less fatal; if lose one part, it’s not a big deal
- compartmentalization allows for fine body control
- e.g. can control every segment independently
- compartmentalization allows for fine body control
- allows for evolutionary “tinkering”
What is a manifestation of evolutionary “tinkering” through metamerism?
- tagmatization: specialization of serially repeated body parts
- since have extra of something, can afford to have it specialized
Have Setae.
What are they?
little hairs that help them interact w/ the environment
Do they shed skin to grow?
No.
They are Lophotrochozoa.
