Wednesday, February 22, 2012

Scribe Post: 2/22/2012

Today in Class...
-Stamp UP page 37
-Collect UP pages 35 & 36
-Notes: Animals Obj # 11-13
-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
-sessile (attatched to something else)
-probably evolved from protists
-no nerves or muscles
Phylum Nematoda:
-Complete digestive tract
Phylum Annelida: segmented worms
Polychaetes and Leeches:
-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
-sensory reception
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


  1. Cici you had so many pictures! It was so helpful and your post is so good. Nice job

  2. Nice job including all of those pictures. They help to describe the concepts in the book and our notes. There was not much else you could talk about so I appreciate how you expanded on the items that you could talk about.