Section 27-3 Flashcards
Of what phylum are earthworms a member?
Annelida
What evidence is there that annelids are more closely related to clams and snails than to flatworms or roundworms?
Annelids, clams, ans snails all share a similar larval stage
What is a septum?
Internal walls between each segment of the body of annelids
Attached to each annelid segment are bristles called _________
Setae
Annelids are among the simplest animals to have a true __________
Coelom
How is the pharynx used differently in carnivorous species than in annelids that feed on decaying vegetation
In carnivorous species the pharynx usually holds two or more sharp jaws that are used to attack prey
What is closed circulatory system?
It is when blood is contained within a network of blood vessels
What is a gill?
An organ specialized for the exchange of gases underwater
How do aquatic annelids respire differently than land dwelling annelids?
Aquatic annelids often breathe through a gill which exchanges gases underwater. Land dwelling annelids take in oxygen and give off carbon dioxide through their moist skin
How do annelids keep their skin moist?
Annelids secrete thin protective coating of mucas which keeps their skin moist
What are the two major groups of body muscles in annelids called?
Longitudinal muscles
Circular muscles
Marine annelids have paddlelike appendages called ____________
Parapodia
What is clitellum, and what I’d it’s function?
A band of thickend, specialized segments, secretes a mucous ring into which eggs and sperm are released
Write the description and habitat or earthworms
Long, pinkish-brown worms with few setae
Woods, fields and gardens
Write the description and habitat for tubifex worms
Red, threadlike worms with few setae
Aquatic areas
Circle the letter of each sentence that is true about leeches
A.) They suck blood and body fluids from their hosts
B.) Most live in moist, tropical habitats
C.) They are typically external parasites
D.) All are carnivores that feed on snails
A
B
C
Circle the letter of each sentence that is true about polychaetes
A.) They typically have only a few setae
B.) They have paired, paddlelike appendages tipped with setae
C.) They suck the blood of their host
D.) They are marine annelids
B
D
What do annelids do polychaetes include?
Sandworms, bloodworms and their relatives
How do the tunnels of earthworms affect other organisms?
They provide passageways for plant roots and water and allow the growth of beneficial oxygen requiring soil bacteria
Circle the letter of each sentence that is true about annelids
A.) Earthworms are important to the diet of birds
B.) Annelids bring minerals from deep soil layers to the surface
C.) Marine annelids spend their lives burrowing through soil
D.) Annelid larvae form part of the animal plankton
A
B
D
