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

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