Which group(s) lack tissue level organization?


Part 1Animals are placed in taxonomic classifications based on differences and similarities of their traits. If you know what critical traits to look for, it is possible to separate any animal into a taxonomic category.

Download the document U5IP Table.

The document contains a table with images. The images are examples of each Phylum: Porifera, Cnidaria, Platyhelminthes, Annelida, Mollusca, Arthropoda, Nematoda, Echinodermata, and Chordata.

First, use the table in your textbook (page 428) to determine which Phylum each organism falls into (you will find a description of chordata on page 450). List the specific traits that distinguish each Phylum . (Please do not just copy the list from the table. Read through the text to pull out detailed characteristics.)

Next, download the document, U5IP_Dichotomous_key.htm , and use the Dichotomous Key to help determine the taxonomic category in which each specific organism belongs. For help on how to use the Dichotomous Key, download the document, U5IP_How_To_Dichotomous_Key

Attachment(s):Dichotomous key[1].pptU5ips_v2.doc

Part 2

Examples of nine Animal Phylum: Porifera, Cnidaria, Nematoda, Arthropoda, Platyhelminthes, Annelida, Mollusca, Echinodermata, and Chordata.

jellyfish, snail, earthworm, fly, spong, starfish, snake, flatworm, roundworm

1.Which group(s) lack tissue level organization?
2.Which group(s) of organism(s) begins to show cephalization?
3.Do all organisms on the chart have 3 germ layers (endoderm, ectoderm and mesoderm)? If not which groups lack all three?
4.One group has more species than all the other groups, give the name of the Phylum and examples of species found in this group.
5.Do all fish have the same skeletal structures? If not, describe the differences.
6.Describe the 3 different types of mammals.