Bio Chapter 27 Warm-up 4
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What do coelomates include?
Mullusks and animals that evolved after them
What do coelomates have that is unique to them?
They have a coelom, a fluid-filled body cavity that develops within the mesoderm
What is the advantage of the coelomate body plan? Examples.
It permits specialised regions to develop (stomach and heart)
In pseudocoelomates, what limits the development of specialized tissue?
The mesoderm and endoderm are sparated by the body cavity
What is the major advancement in coelomates?
An advanced circulatory system that efficiently circulates nutrients, oxygen and wastes
What is a circulatory system?
A network of vessels that carries fluids to all parts of the body
What were the first coelomates to evolve?
What are the only major phylum of coelomates without segmented bodies?
How many named species of Mollusks are there?
Mollusks are the _________________ except for the _____________.
Largest animal phylum, arthropods
Next to _________, ___________ are the most successful ___________ animals.
Insects, Mollusks, land
How many terrestrial mollusk species are there?
How many terrestrial vertebreate species are there?
What are the 3 distinct regions of the bodies of al mollusks? Describe.
- Visceral mass-central section that contains the the body's organs
- Mantle-wrapped around the visceral
- Gills- filamentous projections, rich in blood vessels, that capture oxygen from the water and release carbon dioxide
What distinct region do snails not have? How do they breath?
No gills, breathe air with simple lungs
What regions does every mollusk have and what is it called?
A muscular region called a foot
What are the three classes of mollusks?
What are the characteristics of Gastropods? Examples.
- Use thier muscular foot to crawl
- Mantle often secretes a hard protective shell
- (snails, slugs and all terrestrial mollusks)
What are the characteristics of Bivalaves? Examples.
- Secrete a two-part shell (each a valve) witha hinge
- Filter feeders
- (clams, oysters and scallops)
What are the characteristics of Cephalopods? Examples.
- Under mantle have a modified cavity that creates a jet propulsion system to propel them rapidly through water
- (Octopuses and squids)
What is a radula?
A rasping tongue-like organ with roves of pointed, backward-curving teeth
What do some snails use radula for?
To scrape algae off rocks
What do many cephalopods and gastropods use their radula as?
A weapon to puncture their prey
What mollusks don't have radula and why
Bivalves because they are filter feeders
How do snails eat oysters?
Use radula to creat small holes and then extracts the body
What would you like to do?
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