Mollusca Quiz Flashcards
What structures make up a mollusca?
shell (made of calcium carbonate)
mantle (layer of tissue that makes the shell)
Viceral mass that holds the organs
Foot
What one group has no shell?
aplacophora
What is one group that makes their shell out of something other than calcium carbonate and what is it?
Teuthida
chitin
What are the two terms for a sack of organs?
Viceral mass
coelum
How is the foot used in Cephalopods?
It is turned around and used as a tube to where they can snd ring water out to propell themselves
How did Cephalopods get their name?
their feet and tenticles grow out of their head
What was the first mollusca?
Aplacophora
What is unique about Aplacophora?
they lack a shell
What comes after Aplacophora?
Polyplacophora
What comes after Polyplacophora?
Monoplacophora
What comes after Monoplacophora?
Gastropoda
What is the other name for Gastropoda?
snail
What is the subgroup of Gastropoda?
Pulmonata
What is unique abot Pulmonata?
Lunged
Terrestrial
What comes after Gastropoda?
Cephalopods
What is unique about Cephalopods?
suction tenticles
started closed curculatory system
What does gastro mean?
stomach
What does poda mean?
foot
What are the subroups of Cephalopods?
Nautiloidea Ammonoiea Coleoidea Octopoda Vampyomorphia Sepiida Sepiolida Teuthida
What is unique about Nautiloidea?
chambered shell (use gas in the shell to move)
What subgroup comes off of Nautiloidea?
Nautilus
What is unique about Ammoniodea?
They are all extinct
What is unique about Coleoidea?
Started Chromatophore (color changing cells and reactive skin)
What is unique about Octopoda?
8 legs
lost boyancy
What is unique about Vampyomorphia?
Lives in low ocean
Instead of color changing, its tenticles are luminous
Like octopus
What is another name for sepiida?
cuttlefish
What is unique about sepiida?
Internalized shell called cuttlebone which is porus (holds gas in air pockets) to float
Eyes are simular to vertibrates
What is another name for sepiolida?
Little cuttlefish
What is unique about sepiolida?
Lost the cuttlebone
Houses bioluminesent bacteria which makes it glow
What is another name for Teuthida?
Squid
What is unique about Teuthida?
Shell is internalized and is made of chitin instead of calcium carbonate
largest cephalopoda
moves fast so it is most preditory
feeds on fish
What comes after Cehialopods?
Bivalivia
What animals make up the Bivaliva class?
clams mussels scalops oyster ship worm
What makes Bivaliva unique?
most lost radulal so it filter feeds
Umbo acts as a hinge for two valves that make the shell
Then the foot is made to pump
What is a radual?
a sandy tongue to eat (only Bivaliva doesnt have in Mollusca)
What is uniue about polyplacoploa?
8 plated chitin shell
What is unique about monoplacoploara?
1 plated plated shell
What is adaptive radiation?
When you have a founder group splits into subversions of itself so it can radiate into different enviorments
What does the radula scrape up?
bacteria on the ocean floor
dead mollusks
Where does the aplacophora, polyplaccophora and monoplacophora live?
Burrowed into the deep sea floor
Where do the bivalvias live?
Underneath the surfce or just on the surface
Where do the gastropods live?
Surface of the bottom of the ocean
Where do the Nautilus live and why?
They swim throughout the ocean
They achieved boyancy
What are the two types of adaptive radiation theories?
Phyletic gradualism
Punctuated equilibrium
What is Phyletic gradualism?
New species arise by transformation of large ansectoral group
Transformation occurs over a large part of ancestoral species geographic range
Transformation is even and slow
Evolution comes at same rate
What is Punctuated equilibrium?
A trait becomes rapidally dominate almost overnight by splitting cladogensis
Originates in a small part of geographic range
Developed rapidally
Happens quick then reaches equilibrium
What are stem roots?
Included all the extinct species
What are the crown root?
Includes all the living species
What were the early mollusks and why did they go extinct?
A, Poly, Mono Placophora
Modern Mollusks were stealing all their food
What species do you get brown ink from?
Cuttlefish
