PHYLUM: ________________________
CLASSES: 1. _______________________ 2. ___________________ 3. _________________
1. _______________ body. Segments are called __________________.
2. All organ systems are present.
a. digestive tract: __________, ___________(throat), ______________, ___________ (storage of food), ______________ (grinds food),______________(absorption of nutrients), and ________.
b. ____________ circulatory system with _______ pairs of aortic arches (hearts).
c. Paired _____________ are used to eliminate liquid waste from each segment.
d. ____________ nerve cord present & paired _________ ganglia (brain).
e. respiration through ______________________( no gills or lungs).
3. Movement & anchorage by paired bristles called _______________. Some marine annelids also have fleshy _____________ (like paddles). Thin _____________ present.
4. True body cavity - ______________________.
5. Hermaphroditic & ________ fertilize. Exchange __________ through the __________________ ( a bulge in the earthworm�s body).
6. _______________ symmetry.
7. Live on _______, in _____________________ & in _________________________.
8. Body wall contains ______________ & ________________________ muscles. This allows them to contract (shorten) & to elongate (lengthen) their body.
9. _______________________ larva.
Classed based on # of setae & presence or absence of parapodia.
CLASS POLYCHAETA � sea worms (tube worms) � possess ___________, ______________, & specialized _____________.Have ______________ for movement with setae on them. Most have separate sexes; fertilization is usually ___________. These are all marine and have a well-developed head.
CLASS OLIGOCHAETA � typical earth worm � only a few setae � no parapodia � good aerators of the soil � use their _______________ for grinding food � the _____________ protects the eggs & secretes chitin � no distinct head, no eyes � have light-sensitive & touch-sensitive organs at each end of the body
CLASS HIRUDINEA � leeches � have __________ & ___________ suckers � saliva contains ______________ which prevents blood clotting � no setae or parapodia � coelom is not segmented