annelids Flashcards
what kind of coelom
coelomates
what are septa
partitions that divide the coelom
what kind of skeleton
hydrostatic
how do they move
- circular muscles contract: segments thin and elongate
- longitudinal muscles contract: segments thick and shorten
what kind of body plan
tube within a tube
what digestive parts are specific to annelids?
crop, gizzard for grinding food
what kind of circulatory system? describe
closed
- 5 hearts (earthworms)
- ventral and dorsal blood vessels
nervous system?
- brain
- ventral nerve cord
- with ganglia
excretory?
nephridium tubules
which classes have cephalization?
clamworms and leeches
what do clam and earth worms have for movement
setae: bristles
how do they fertilize
lie next to each other, clitellum of one puts sperm in
respiratory system?
diffusion through skin
what appendages do clamworms have?
- parapodia: paddle-like. also for respiration
- tentacles
how do clamworms feed?
- predators
- chitinous jaws
- some are sessile filter feeders
how do earthworms feed?
scavengers
how do leeches feed?
- 2 suckers
- fluid feeders: attach to open wounds
- saliva has hirudin: keeps blood flowing and prevents clotting
are they hermaphroditic?
yes
do clamworms have breeding seasons?
yes
- shed body with eggs / sperm
do they self fertilize?
no
