Porifera (Sponges)

What animals are in the phylum Porifera?

Sponges

What is the sponge level of organization?

Cellular level (no tissues)

What is the symmetry of sponges?

Asymmetry or radial

What is the habitat of sponges?

Aquatic primarily marine

What is the meaning of the term sessile?

Adult filter feeders

What are epidermal cells?

(pinacocytes) thin flat epithelial cells covering the outer surface

What are porocytes?

form the ostia (pores) through which water enters the sponge's body

What are amoebocytes?

(archaeocytes) move through mesophyll to phagocytize particles and transport nutrients

What are choanocytes?

Collar cells. Flagellated cells line the canals and chambers. Used for feeding

10. What 2 things make up the skeleton of sponges? Do all sponges have both?

1. Calcium Carbonate

2. Silica

3. Spongin

11. What are spicules? They are made of what 2 things?

1. Calcium Carbonate

2. Silica

3. Spongin

12. What are the 3 sponge body forms?

1. Asconoids

2. Syconoids

3. Leuconoids

13. What does each body form look like?

1. Simple, Water enters through pores

2. Thicker body wall, choanocyte lined radial canals

3. Most complex flagellated chambers

14. How do sponges feed?

They filter water through trapping the food in.

15. How do sponges excrete wastes and carry out gas exchange?

It diffuses as the water filter through

16. What type nervous system do sponges have?

cell communication system

17. Do sponges reproduce sexually or asexually?

Both

18. Are sponges monoecious or dioecious?

Monoecious

19. What are 3 means of asexual reproduction in sponges?

1. Budding

2. Fragmentation

3. Internal buds

20. What is budding?

external buds break off after attaining a certain size

21. What is regeneration?

Sponges can regenerate themselves

22. What are gemmules?

Internal buds that survive harsh conditions