phyla and classes of animal kingdom

which phylum DONT have classes?

porifera, platyhelminthes, cnidaria

porifera phylum characteristics

• 2 distinct openings

• multicellular

• sessile (cannot move on its own)

ex. sponge, sycon

cnidaria phylum characteristics

• radial symmetry

• 2 digestive openings

• simple nervous system (nerve-net)

ex. coral, jellyfish, hydra, sea anenomes

platyhelminthes phylum characteristics

• 1 digestive opening

• hollow nerve cords

• bilateral symmetry

• lacks fluids in its body

ex. flatworm, tapeworm, flukes

what phyla HAVE classes?

annelida, mollusca, arthropoda, echinodermata, chordata

annelida phylum characteristics

• segmented worms

• bilateral symmetry

• breathes through fins/gills

• complete digestive system

ex. earthworm, leech, bristle worm

what are the classes for annelida phylum

polychaeta, oligochaeta, hirudinea

polychaeta class characteristics

• annelida phylum

• segmented body

• many bristles

• well developed head/sensory organs

ex. bristle worm, bobbit worm

oligochaeta class characteristics

• annelida phylum

• male + female reproductive glands

• slimy body to move

• segmented worm w/ no head

• few bristles

ex. earthworm or other freshwater species

hirudinea class characteristics

• 34 body segments

• Annelida phylum

• 2 suckers on its body

• 3 jaws

• no larva/baby stage

• flattened body

ex. leech

what are the classes for mollusca phylum

gastropoda, cephalopoda, bivalvia

mollusca phylum characteristics

• unique feeding tool (radula)

• singular muscular foot for movement

• mantle cavity, which houses gills or lungs

ex. cuttlefish, octopi, scallops

gastropoda class characteristics

• unsegmented body

• mollusca phylum

• stomach foot for movement

• mantle cavity

• anus placed above head

ex. snails, slugs, nudibranches, limpets

cephalopoda class characteristics

• closed circulatory system

• mollusca phylum

ex. octopus, ammonites, giant squid

bivalvia class characteristics

• mollusca phylum

• 2 part hinged shell

• soft body

• no distinct head

• gills used for feeding/breathing

ex. clams, oysters, mussels

what are the classes for arthropoda phylum

insecta, arachnida, crustacea, chilopoda, diplopoda,

arthropoda phylum characteristics

• largest phylum in animal kingdom

• segmented body

• open circulatory system (circulates through cavity)

ex. insects, spiders, scorpions, shrimps

insecta class characteristics

• arthropoda phylum

• largest class in this specific phylum

• 3 pairs of jointed legs

• breathes through tubes

• body consists of head, thorax, and abdomen

ex. pollinators, bee, decomposers, pests

arachnida class characteristics

• 2 body segments

• 4 pairs of joint legs

• arthropoda phylum

• first pair of appendages are modified into fangs

ex. spiders, scorpions, mites, ticks

crustacea class characteristics

• arthropoda phylum

• appendages usually branched

• pair of mandible (lower jaw)

• breathes through gills

ex. scavengers, crab, filter feeder

chilopoda class characteristics

• arthropoda phylum

• made of flattened segments (can be up to 177)

• every segment has 2 legs

• poisonous fangs

ex. centipede

diplopoda class characteristics

• arthropoda phylum

• segmented

• 2 pairs of legs on most segments

ex. millipedes, julida, turtle

what are the classes for echinodermata phylum

echinoidea, asteroidea, holothuroidea

echinodermata phylum characteristics

• 5 sided radial symmetry

• lacks heart, brain, and eyes

ex. sea urchin, starfish

echinoidea class characteristics

• echinodermata phylum

• no head or brain

• bilateral symmetry

ex. sand dollar

asteroidea class characteristics

• echinodermata phylum

• has several arms (5-40)

• mouth on their underside

• tiny suction to move about

ex. starfish

holothuroidea class characteristics

• echinodermata phylum

• worm like with radial symmetry

• 2 openings (anus and mouth)

• body gets support from thick sheets of body wall muscle

ex. sea cucumber

what are the classes for chordata phylum

mammalia, amphibia, repitilia, aves, chondrichthyes, osteichthyes

chordata phylum characteristics

• hollow nerve cords

• post anal tail

• can be asexual or sexual reproduction

• has vertebrate

• eats through mouth

ex. white tiger, great white shark, koala, dunlin birds

mammalia class characteristics

• has hair or fur

• chordata phylum

• mammory glands to feed their young

• diaphragm

ex. humans, dogs, cats, horses, whales

amphibia class characteristics

• respirates through skin (cutaneous)

• cold blooded

• chordata phylum

• webbed feet

ex. frog, toad, salamander

repitilia class characteristics

• scaly skin

• chordata phylum

• body temperature is based on their environment

• lays eggs with protective shells

ex. iguana, turtle, ostrich, alligator

aves class characteristics

• arms modified into wings

• beak, feathers

• chordata phylum

• lays eggs

• 2 legged

ex. swan, ostrich, toucan

chondrichthyes class characterisitcs

• chordata phylum

• skeleton of cartilage

• fins, gills, powerful jaw

ex. shark, stingray

osteichthyes class characterisitcs

• chordata phylum

• skin has mucous glands

• sensory organs on their sides

• hard/bony plate that covers their gill chamber

ex. catfish, seahorse, eel