Zoo test 2
Card Set Information
Zoo test 2
sponges parasites test 2
There are about 5,500 living species, most marine although there are about____freshwater species and____ freshwater species in teh US.
30 in US
What is the level of organization in Phylum Porifera?
What is the Symmery in Phylum Porifera?
Unique flagellated cells that drive water through canals and chambers in the sponge: Aquiferous system
Phylum Porifera has what type of reproduction?
sexual by sperm, egg, and ciliated larvae
Asexual though gemules and budding
can change cells and change back
All cells are loosley arranged into a gelatinous matrix called the...
Water enters small holes called the...
Water exits large holes called the...
What are the three types of canal sponges?
rarely exceed 10m in height
Choanoderm is one cell thick
Simple folding of the pinacoderm and choanoderm
As complexity increases in Syconoid sponges what may happen?
the mesohyle may thicken and appear to be two layers thick
Leuconoid sponges are the
most common sponge
Additional folding of the choanoderm and further thickining of the...
4 types of sponge cells are...
Pinacocyte's main functions are..
(like sponge skin)
What are porocytes? and what is their function?
Cells that form a pore
To allow water flow
Choanocytes do what?
Line the flagellated canals and chambers
What is a choanocytes main function?
To create water flow
Archeocytes (Mesenchyme) are found where?
In the cellular matrix
Archeocytes are what?
amoeboid cells which can be non-sessile
What are the main functions of Archeocytes?
Secrete structural components such as spongin and spicules
What keeps the Mesohyle together?
What is spongin?
Fibers of collogen
What are spicules?
Spines, when placed together form a very rigid skeleton
What are the three main classes of sponges?
Calcarea sponges have what type of skeleton?
Calcarea sponges are how tall?
Hexatinellida are what kind of sponges?
..spicules made of glass (
Where do hexactinellida live?
Marine and deep water
What is the common sponge?
What type of skeleton does Demospongiea have?
It is variable
Where does demospongiea live?
Marine and include freshwater species
Sponges are metazoans but don't have....
sponges are an_____group
In asexual sponge reproduction there is...
Gemmule formation happens in what type of sponges?
Gemmules are formed in what kind of conditions?
Gemmules are______ resistant
is the most common FRESHWATER sponge.