Porifera

Question 0

What is the common name for members of the phylum Porifera?

Answer 0

Sponges

Question 1

What level of organization do members of the phylum Porifera demonstrate?

Answer 1

Cellular level of organization

Question 2

What are the sponge’s flagellated feeding cells that line the cavities and create currents of water?

Answer 2

Choanocytes

Question 3

What two main structures can help to support sponges?

Answer 3

Spongin (fibers) and/or spicules (internal skeleton)

Question 4

Name the phylum, class, and order of the syconoid sponge Sycon.

Answer 4

Phylum: Porifera; Class: Calcarea; Order: Heterocoela

Question 5

Explain the order in which water flows through a Sycon sponge.

Answer 5

1. Dermal ostium 2. Incurrent canal 3. Prosopyle 4. Radiated canal 5. Apopyle 6. Spongocoel 7. Osculum

Question 6

What are the organisms that are a result of asexual reproduction in some sponges, which can later develop into a sponge?

Answer 6

Gemmule

Question 7

What are the four classes of Porifera?

Answer 7

Calcarea, Demospongiae, Hexactinellida, Homoscleromorpha

Question 8

Describe each classes of Calcarea and hexactinellida.

Answer 8

Calcarea- all marine; spicules of calcium carbonate; spicules needle shaped, 3 rayed, or 4 rayed; canal systems asconoid, syconoid, or leuconoid
Hexactinellida- all marine; mostly deep water glass sponges; spicules 3-D, 6-rayed siliceous; spicules often united to form network; body often cylindrical; syconoid or leuconoid

Question 9

Describe class Demospongiae.

Answer 9

Mostly marine; with siliceous spicules (not 6-rayed) or spongin or both; canal systems leuconoid; most sponges belong to this class

Question 10

Describe class Homoscleromorpha.

Answer 10

Skeleton reduced; spicules lacking in some