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
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

2 comments:

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

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  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.

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