Scribe Post: 2/22/2012

Today in Class...

-Stamp UP page 37

-Collect UP pages 35 & 36

-Notes: Animals Obj # 11-13

Homework:

-Study Animal Notes

-Nature article due 3/2

-Isopod Research??

-Earthworm lab due TOMORROW

Material covered in class today:

We mostly covered notes, so the following includes key points and more images for better comprehension

Animal Phylogeny:

-This is one hypothesis about the evolutionary relationships among the following animals

Body Symmetry:

a) radial symmetry: animals may be cut in any direction to produce two equal parts

b) bilateral symmetry: animals can only produce two equal halves by a single longitudinal cut

Body Cavities: a fluid filled space separating the digestive tract from outer body wall

Acoelmate: lacking a body cavity. ex flatworms

Pseudomate: Possesses a body cavity partially lined by mesoderm (middle layer of tissue) ex. Roundworms

Coelemate: Possesses a body cavity completely lined by mesoderm. ex. earthworms

Phylum Porifera

-Sponges

-sessile (attatched to something else)

-probably evolved from protists

-no nerves or muscles

Phylum Nematoda:

-Roundworms

-Complete digestive tract

-Pseudocoelom

Phylum Annelida: segmented worms

-Earthworms

-Polychaetes

-Leeches

Polychaetes and Leeches:

-marine

-segmented appendages and hard bristles

Phylum Mollusca:

-snails, slugs, clams, octopuses, & squid

-soft bodied animals

-3 major classes of mollusks: gastropods, bivalves, and cephalopods

Phlyum Arthropoda

-Crustaceans, Millipedes, Centipedes, and Insects

-segmented animals

-walk

-feed

-sensory reception

-copulation

-defense

Phylum Echinodermis:

-Seastar, Sand dollar, Sea Cucumber

-Spiny skin

-Larvae form: bilateral symmetry

-Adult form: radial symmetry

Thank you! Hope this is helpful

Next scribe *** michael d