Lab Activity 4.2
Complex Worms and Lophoporates

  Directions

Study the instructional material below. Be sure to click on each of the photographs for an enlarged view in a separate window. The larger version is necessary to complete the assignment. It opens in a separate window which can be resized by grabbing the bottom right corner and dragging it. It can also be moved by grabbing the top heading bar and dragging it. Be sure to close the extra window by using the X in IBM, or the close box in MAC when you are finished using them.

  Introduction


Marine invertebrates are animals without backbones that live in the sea. Over 97 percent of all animal species are invertebrates and the majority of these are marine. These species are divided into 33 phyla of which three phyla the Annelida (segmented worms), the Bryozoa (moss animals), and the Brachiopoda (lamp shells) will be featured in this lab activity.

Top  Instruction

Examine the photographs of the invertebrates depicted below. Study the descriptions that go with each photograph and learn the stated information about the biology of each one.

Be sure to write about what you are learning in the lab section of your notebook. You will be expected to answer questions about the lab activity during the lab self test and lab quiz. It helps to have your text and coloring books open beside you for support.

 
Supporting Information
Refer to the Assigned Readings Below:
Marine Biology Textbook Chapter 7, pages 126 to 127 and 139 to 141
Marine Biology Coloring Book Plates 26 to 28 and 38
 

Phylum Annelida (segmented worms): Polychaetes
1. The bodies of bristle worms are divided into repeated segments. Each segment has a pair of paddle-like appendages called parapodia.

2. The head of the palolo worm is adorned with sensory structures such as palps and eyes.

3. The bristles of the sea mouse are long and hair-like which makes the animal look a little like a mouse.

 

4. Sedentary bristle worms live in semi-permanent burrows or tubes which they build from body secretions and particles.

5. The spaghetti worm Amphitrite uses many long, narrow tentacles as tiny conveyor belts to deliver food particles to its mouth.

6. The fan worm Sabella uses a crown of feathery radioles to filter food particles from the water.
Phylum Bryozoa (moss animals): Moss Animals
1. In a Bugula colony the individuals are arranged in tiny shell boxes.

2. Individuals in the colony obtain food with their tentacles.

 

3. Bryozoans are named moss animals because they look like plants.

 
Phylum Brachiopoda (lamp shells): Lamp Shells
1. A lamp shell might be mistaken for a clam because it looks like one on the outside.

2. On the inside, a lamp shell looks different. It has a large horseshoe-shaped lophophore, which it uses for feeding.

 

3. A lamp shell also has a fleshy pedicle which it uses to attach to the bottom.

 


Lesson 4
Lab Activity 4.1 Simple Invertebrates