Kingdom Animalia : Phyla

Today's schedule was going over the hydra and planarian lab, do pages 33-34 in the UP, and then notes.

Pages 33-34 was about a phylogenetic tree. *Animals on the outside are still living and animals that stop somewhere in the middle went extinct.

Embryonic development details:

Two branches for the animals with true coeloms:

1. Mollusks, annelids, and anthropods- mouth comes first -- protostomes
2. Echinoderms and chordates- anus comes first -- deuterostomes

Animalia Kingdom: 8 major phyla

Porifera- sponges

they are sessile;

simplest animals;

can be 1 cm or 2 m;

no nerves or muscles;

live in marine (salt water);

body is like a sace perforated with holes to let the water flow through;

digest food using phagocytosis;

eat bacteria from the water.

Cnidaria- jellyfish

have radial symmetry (more than one way to cut in half);

carnivores with stinging cells;

have a gastrovascular cavity (mouth and anus in one);

can be sessile (polyp) or free-floating (medusa).

Platyhelminthes- flatworms

bilateral symmetry (only one way to cut in half);

can live in marine, freshwater and even damp land;

can be parisitic (tapeworms);

no digestive tract in the parasites.

Nematoda- roundworms

most diverse animals known;

they live in wet soil and most aquatic habitats;

they have a completes digestive tract (mouth and an anus);

they are pseudocoelomates (body cavity partially lined with mesoderm;

can be very parasitic.

Mollusca- snails

soft bodied-usually with a hard protected shell;

feed using a straplike rasping organ called a radula;

can live in freshwater, marine, or land;

three main parts to the body-a muscular foot, a body mass with organs, and a drape-like mantle;

three major classes-gastropods (snails and slugs)

-bivalves (clams, oysters, and mussels)

-cephalopods (squids and octopuses)

Annelida- segmented worms

have body segementation (division on body into equal parts);

live in the sea, freshwater, and wet soil;

three major classes are earthworms, polychaetes, and leeches;

nourish the soil;

polychaetes are marine;

leeches have been used for medicine in the past.

Arthropoda- millipedes

have jointed appedages;

most successful phyla;

specialized functions: walking, feeding, sensory reception, copulation, defense, exoskeleton.

Echinodermata-seastars

HAVE NOT FINISHED THE NOTES ON THESE AS OF NOW.

The homework was UP pgs 37-38, prelab pgs 45-54, nature cover, and to read chapter 17

Next scribe: Skyler

( these were colorful but the color didn't work :[