Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account

Phylum Mollusca: mollusks

soft bodied animals; chambered heart but open circulatory system; body structure consists of a visceral mass of organ systems in a soft body; body covered by mantle with secretes the shell; uses a foot for locomotion; protosomes, coelmates; class polyplacophora, gastropoda (snails and their relatives), bivalvia (clams, oysters and relatives) cephalopoda (octopus, squid, nautilus)

Phylum Annelida: annelids

segmented worms; first group to have a true coelom body cavity; closed circulatory system; segmented bodies; protosomes; class oligochaeta, hirudines, polychaeta


initial opening into developing gut becomes the mouth

Phylum Arthropoda

largest group of animals; paired jointed appendages; exoskeleton made of chiton (like fungi); segmented bodies sometime in life cycle; open circulatory system

Phylum Arthropoda: Subphylum Chelicerata:

cephalothorax and abdomen; class merostomata (horseshoe crab), class arachnida (spiders, mites, scorpions, ticks, daddy-long legs)

Phylum Arthropoda: Subphylum Crustacea

class malacostraca (lobsters, crabs, shrimp, isopods); Oder Decapoda (fiddler crab)

Phylum Arthropoda: Subphylum Hexapoda

class insecta; head thorax, abdomen, 3 pairs of legs on thorax; trachea; mainly terrestrial

Animals in the Mollusca phylum are described as

soft bodied

mollusks use a

foot for locomotion

the four classes in phylum mollusca

class polyplacophora, gastropoda, bivalvia, cephalopoda

mollusks have a chambered heart

but open circulatory system

Phylum Mollusca, Class Gastropoda, Genus


Helix snails are terrestrial



feeding organ of almost all molluscan groups

three ways the radula is used

scraper, rasping tongue, drill

mantle is used as a

functional lung


having a lung


body and shell turned 180 degrees

torsion in the helix snail has created the sanitation problem

because the anus is over the head

the buccal mass contains the

mouth and the radula

helix snail's brain consists of

connected cerebral, pedal, and pleural ganglia

sexually pulmonate snails are described as


Phylum Annelida: earthworm

phylum annelida, class oligochaeta, genus lumbricus

earthworms must have

water in their environments because they breathe by osmosis


tiny, bristlelike projections used for locomotion


bladderlike organ, releases liquid waste


thick walled muscular organ, expands and contracts using sand grains to grind food

seminal receptacles

receive and store sperm for the male

seminal vesicles

store sperm before it is sent to the seminal receptacle for the female

sexually earthworms are described as


phylum arthropoda: fiddler crab

phylum arthropoda, subphylum crustacea, order decapoda, genus uca

how do fiddler crabs affect the growth of marsh grasses

as they burrow deep into the mud of the marshes, the crabs collectively create a maze of tunnels which directly affect the growth of marsh grasses through aeration


one of two big claws used for defense and food handling


the hard protective outer shell of the crab, made of chitin


reabsorbing the shell as it grows

are fiddler crabs able to grow a new claw if one of theirs breaks off


male fiddler crabs wave and tap their large cheliped to do what

challenge other males to fight to impress the females


feeding appendages around the mouth

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording