Home
Flashcards
Preview
Zoo test 2
Home
Get App
Take Quiz
Create
There are about 5,500 living species, most marine although there are about____freshwater species and____ freshwater species in teh US.
200
30 in US
Metazoa
without tissue
What is the level of organization in Phylum Porifera?
Cellular
What is the Symmery in Phylum Porifera?
None
superficially radial
Choanocytes
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
totipotent
can change cells and change back
All cells are loosley arranged into a gelatinous matrix called the...
Mesohyle
Water enters small holes called the...
Ostia
Water exits large holes called the...
Oscula
What are the three types of canal sponges?
Asconoid
Syconoid
Leuconoid
Asconoid Sponges...
Simple organization
rarely exceed 10m in height
Choanoderm is one cell thick
Syconoid condition:
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...
mesohyl
4 types of sponge cells are...
Pinacocytes
Poracytes
Choanocytes
Archeocytes
Pinacocyte's main functions are..
Structure
Contraction
(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?
Digestion
Secrete structural components such as spongin and spicules
What keeps the Mesohyle together?
Spongin
spicules (spines)
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?
Hexatinellida
calcarea
Demospongiea
Calcarea sponges have what type of skeleton?
Calcium carbonate...spicules
Calcarea sponges are how tall?
about 10cm
Hexatinellida are what kind of sponges?
Glass sponges
..spicules made of glass (
six rayed
)
Where do hexactinellida live?
Marine and deep water
What is the common sponge?
Demospongiea
What type of skeleton does Demospongiea have?
It is variable
-spicules
-spongin
BOTH!
Where does demospongiea live?
Marine and include freshwater species
Sponges are metazoans but don't have....
True tissues
sponges are an_____group
Ancient...(dead end)
In asexual sponge reproduction there is...
Budding
Fragmentation
Gemmule formation
Gemmule formation happens in what type of sponges?
Freshwater
Gemmules are formed in what kind of conditions?
Harsh
Gemmules are______ resistant
Enviromentally
Spongilla Lacustris
is the most common FRESHWATER sponge.
Author
lchay
ID
8264
Card Set
Zoo test 2
Description
Sponges-parasites
Updated
2010-02-26T23:32:51Z
Show Answers
Home
Flashcards
Preview