Characteristics
What is a soft bodied invertebrates with bilateral symmetry, and has one - two shells.
MOLLUSCS
True or false? Gastropods are the biggest group of Mollusks?
True
The _____________ bring in water which passes over the gills
SIPHON TUBES
Animals that have a dorsal nerve chord, notochord and pharyngeal gills slits
CHORDATES
What is the name of the fish that is characterized by a circular sucking mouth that lacks a jaw?
Jawless fish
Something that covers the organs of a mollusks and protects internal organs
MANTLE
A tongue-like organ with rows of teeth to obtain food.
RADULA.
What part of the clam keeps the shell closed?
Adductor muscle
Name ONE use for A MOLLUSC
FOOD and jewelry
All bivalves are___________________ feeders
FILTER
How many shells do gastropods have?
ONE
What are the shells of most bivalves built from?
Calcium carbonate
Primitive chordate that have both male and female reproductive organs?
Tunicates
What precious stone can you get out of a Mollusc
PEARL
Bivalves move using _____________ to open and close the shell
ADDUCTOR MUSCLES
Gastropod means ___________
Gastropod means “stomach footed”
How can a clams age be determined?
Counting their rings
What type of jawless fish uses its mouth to burrow into the bodies of dead fish?
Name the primitive chordate that lives between the intertidal and subtitle zone?
Acorn worms
Layers of _______________ form around the grain, forming a pear
Calcium carbonate
- thick pad of tissue that closes like a trapdoor over the foot and protects the snail
OPERCULUM
What animals are Bivalves? LIST THREE
clams, oysters, and scallops.
What type of jawless fish uses sucking disks to attach to living trout?
Lamprey
When were jawless fish abundant? What Period?
SILURIAN