Flashcards in Mollusks - How the nervous system works Deck (91)
how many species of Mollusca are there?
more than 100,000
Mollusca is the ____ largest animal group after arthropods
How are Mollusca diverse?
they are diverse in their
- modes of nutrition
- response to environment
how are Mollusca symmetrical?
Mollusca are ___plastic
what are the four major groups of Mollusca
what does the mantle cavity of Mollusca contain?
For land living organisms the mantle cavity is ...
an extended space for surface oxygen exchange
The front end of the intestine is known as the
the Polyplacophora is known as the
"bearer of many plates"
how many overlapping plates does the Polyplacophora have?
where are the gills located in Polyplacophora
in the mantle grooves?
Polyplacophora are able to withstand ___ ____
Bivalvia means ...
Bivalvia have a reduction of
the mantle cavity of Bivalvia is modified by
how do Bivalvia get oxygen?
by using their gills
what else do the gills of Bivalvia do?
are Bivalvia sessile or mobile?
what kind of feeders are Bivalvia
Siphons are extensions of
In Siphons water flows in the __ ___ and then across the ___ that act as ___ for food
mantle cavity ; gills ; filters
there are two exits/entries in Siphons
one water is sucked in and the other water is squished out
what is the most diverse group of mollusks?
how many species of Gastropoda are there?
what kind of eaters are Gastropoda?
herbivores, predators, scavengers
what kind of fertlization do Gastropoda do?
both internal and external
Gastropoda are either _______ or hermaphroditic but can produce only sperm or eggs at any given time