• The phylogenetic relationships between invertebrate phyla. What major characte

CH3CH2CH2Br + CH3CH2S- .......> CH3CH2SCH2CH2CH3 The ethylsulphide ion reacts with the propyl bromide to give ethylpropylsulphide

ID: 897936 • Letter: #

Question

•The phylogenetic relationships between invertebrate phyla. What major characteristics are used to classify invertebrates?

•The similarities and differences in anatomy of these invertebrate phyla.

•The relationship between body form and lifestyle/habitat of an organism

OBJECTIVES

•On the Bluedoor activity videos, which lower invertebrate phylum has the greatest diversity?

•Which phyla do crinoids and sea cucumbers belong to?

•Which phyla is commonly referred to as roundworms?

PRE-LAB QUESTIONS

ALL TRIPLOBLASTIC AND BILATERAL

•These are further categorized based on type of body cavity (coelom)

•Three types of body cavity: Acoelomate, coelomate, pseudocoelomate

Acoelomate- no body cavity

Between the gut and outer body wall

Pseducoelomate- fluid-filled cavity

separating the gut from body wall

Coelomate- fluid-filled body cavity

lined completely with tissue derived from the mesoderm. They also have mesentery that suspend the internal organs within the gut

•Flatworms: bilateral symmetry, triploblastic, acoelomate

•Gas exchange occurs across the surface of their body hence why they are flat (increases surface area)

•Three classes: Trematoda, Cestoda, and Turbellaria

EXERCISE 1: PLATYHELMINTHES

CH3CH2CH2Br + CH3CH2S- .......> CH3CH2SCH2CH2CH3

The ethylsulphide ion reacts with the propyl bromide to give ethylpropylsulphide

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