Tuesday, February 28, 2012

Scribe Post 2/28/12

Today in Class...
-Turned in Starfish Lab
-Did Arthropod Lab (UP. 59-62)
-Did Phylum Chordata Notes (p.24-25)
-Watched Life in the Undergrowth (Last 5 minutes of class)

Arthropod Lab
In this lab we were trying to distinguish differnces between the three classes, Class Insecta, Class Crustacea, and Class Arachinda, of Phylum Arthropada. The three organisms we compared were a crayfish, a grasshopper, and a spider.
Crayfish Diagram (side view)-

Grasshopper Diagram (side view)-

Spider Diagram (side view)-

Even though these organisms share many similarities, they also have distinct differences due to the fact that they are in different classes. Here are a few differences between the organisms-
-number of leg pairs:
grasshopper: 3 pairs
crayfish: 4 pairs
spider: 4 pairs
-number of body regions:
grasshopper: 3
crayfish: 2
spider: 2
-antennae present:
grasshopper: yes
crayfish: yes
spider: no
-wings present:
grasshopper: yes
spider: no

Phylum Chordata Traits:
-pharyngeal slits
-post-anal tail

Vertebrates-chordates which have a backbone

Class Agnatha
-Jawless Fish
-2 chambered heart
-ectothermic or exothermic

Class Chonrichthyes
-Cartilaginous Fishes-Sharks, Skates, and Rays
-have flexible skeleton made of cartilage
-2 chambered heart
-ectothermic or exothermic

The video showed various types of centipedes, some as long as 13 inches, and the ways they optained their prey.
If you missed it, here's a segment of it-


-finish UP. 59-62
-Up. 73 due Thursday
-Study... Quiz..
-Nature due Friday

Next Scribe: Olivia


  1. I was absent that day and the pictures really helped me do the lab at home!

  2. Brianna,
    Good post! I liked the diagrams and the information was very concise. Thanks, Melissa

  3. I lost my notes for this unit so your post consolidating everything and the notes packet on Moodle helped a lot! Great job, if the pictures were a little bigger it would be a bit more useful, but other than that your content is very detailed.