Molluscs Flashcards
polyplachophora head
no sense organs
has radula
polyplachophora foot
has mucus glands
water flow through mantle cavity
50-60 gills with ciliated epithelium and gills that direct flow of water that ventilates
polyplachophoran reproduction
gonochoric
external fertilization
trochophore larva
gastropod head
abundance of sense organs
limpets
foot is sucker to attach to subtrate
radula for scraping algae
abalone
radula to feed on plant tissue
moon snail
foot digs into sand and drills using radula
then sucks out food
gastropod nervous system
streptoneurons (twisted)
bivalve foot
adapted for digging
bivalve muscles
adductor
bivalve siphons
has sensory tentacles
hemal system of bivalves
open
oxygenated blood from gills - atria- ventricles
bivalve excretory
2 nephridia
urine released from nephirdopore
bivalve digestion
ventral food grooves to transport food particles to mouth using ciliary beat filter feeder sessile lateral compression of body loss of radula
bivalve respiration
siphon - ostia - exhalant chamber
bivalve nervous
4 major ganglia
cerebral, pleural, pedal, visceral
cephalopod head
10 appendages
cephalodpod foot
funnel combined with head
suckered appendages
cephalopod shell
dissapeared @ same time jawed fishes appeared
cephalopod muscles
circular
funnel
cephalopod gills
branchial heart supplies gills with unoxygenated blood
cephalopod hemal
systemic heart
cephalopod digestion
meet at 5 way function
stomach, intestine, gastric cecum, esophagus , diestive gland
cephalopod nervous
ganglia all over body
stellate ganglia at tips of gills - giant axons
circumesophageal nerve ring- around esophagus
