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Kingdom Animalia: Phylum Mollusca, Annelida, Arthropoda

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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
Protosomes
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
Helix snails are terrestrial
herbivores
Radula
feeding organ of almost all molluscan groups
three ways the radula is used
scraper, rasping tongue, drill
mantle is used as a
functional lung
pulmonate
having a lung
torsion
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
hermaphroditic
Phylum Annelida: earthworm
phylum annelida, class oligochaeta, genus lumbricus
earthworms must have
water in their environments because they breathe by osmosis
setae
tiny, bristlelike projections used for locomotion
nephridia
bladderlike organ, releases liquid waste
gizzard
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
hermaphroditic
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
cheliped
one of two big claws used for defense and food handling
carapace
the hard protective outer shell of the crab, made of chitin
molting
reabsorbing the shell as it grows
are fiddler crabs able to grow a new claw if one of theirs breaks off
yes
male fiddler crabs wave and tap their large cheliped to do what
challenge other males to fight to impress the females
Maxillipeds
feeding appendages around the mouth