1worms in the Phylum Annelida are referred to as
segmented worms
2segmented worms are
the most advanced worms
3annelids have
three main body regions: the head, segments, and pygidium
4the head of a segmented worm has two main parts:
the prostomium and mouth
5the youngest segment of an annelid is
always at the end, near the pygidium
6short, stiff needlelike bristles that help segmented worms to anchor and with locomotion are known as
setae
7a stretchy sac that holds materials temporarily in the digestive system of an annelid is called a
crop
8a thick, muscular sac that grinds food into small pieces so it can be absorbed by the intestine of an annelid is called a
gizzard
9most annelids have a closed
circulatory system
10earthworms have
5 pairs of aortic arches that serve as hearts
11earthworms belong
to Class Oligochaeta
12leeches belong
to Class Hirundinea
13about 2/3 of annelids are
marine worms
14each segment is marked by external circular rings called
annuli
153 types of movement used by annelids
burrowing, crawling, swimming
16leg-like bristles that aid aquatic annelids in swimming
parapodia
17nutrients are absorbed by the
intestines
18annelids have no
respiratory system
19a reproductive structure that generates mucus that aids in sperm transfer and gives rise to a cocoon within which fertilization occurs
clitellum
20earthworms are sometimes called
"night crawlers"
21good soil can have
as many as 1 million worms per acre
22leeches have
suckers at each end of the body with separate "brains"
23most leeches are
temporary parasites who are fluid feeders
24once full a leech may not need to eat again for
months
25worm ranching is
a major industry, with sales to both gardeners and fishermen