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19 Cards in this Set

  • Front
  • Back
1. Chitons are found in which phylum and class?
2. give a few characteristics of chitons
1. phylum mollusca, class polyplacophora
a. have valves on outer mantle
b. large foot extends over ventral side of body
c. move by pedal waves
What is torsion and what organism exhibits it?
a. a counterclockwise 180 degree twisting of the head and foot relative to the shell, mantle, and the rest of the body
b. gastropods (snails)
Give several examples of organisms in the class Bivalvia
1. clams
2. scallops
3. mussels
4. oysters
Characteristics of class Bivalvia (list 4-6)
1. hinged shell that is closed with 1 or 2 adductor muscles
2. lateral compression of body and foot
3. lack of cephalization
4. spacious mantle cavity
5. sedentary lifestyle
6. absence of radula/odontophore complex
bulge on dorsal surface of bivalve shells near hinge. made up of the earlies shell material deposited by the animal
how does water move into and out of bivalves
move into through an incurrent siphon then passes dorsally between gill filaments and exits through a excurrent siphon
located on posterior end of organism
circulatory-dorsal/ventral blood vessel
nervous- brain and ventral nerve cord
anterior- prostomium
setae- present
larva- trochophore
kidney like structures found in segments of annelids
the 3 layers of molluc shells
nacreous layer
prismatic layer
mollusc shells primarily consist of what
calcium carbonate in a protein matrix
the mantle cavity of a mollusc contains the gills which are known as
gastropods move by
action of cillia
pedal waves
examples of cephalopods are
squids and chambered nautilus
the nautilus moves by
jet propulsion, expelling water from the mantle cavity through a flexible hollow siphon
the shell of a squid is
thin, stiff, proteinaceous sheet, called the pen
cephalopod vision
light is focused within the cephalopod eye by moving the lens toward or away from the retina
all molluscs have a blood circulatory system
in cephalopods the system is completely closed
in all other molluscs the system is largely open and blood moves through the hemocoel
all adult annelids possess at least one pair or chitinous bristles known as
worm shaped