Phylum Platyhelminthes "flat worms" (unsegmented worms) Flashcards
1
Q
how many species of these are there
A
20 000
2
Q
what type of symmetry
A
bilateral symmetry with moderate cephalization
3
Q
what is cephalization
A
balance
4
Q
do they have a body cavity
A
no
5
Q
what is it called when something lacks a body cavity
A
acoelomate
6
Q
describe body
A
possesses several distinct organs, organ systems, and true longitude muscles
has simple sense organs
7
Q
describe digestive system
A
incomplete,
one opening
8
Q
describe the excretory system
A
primitive
9
Q
describe the reproductive system
A
complex
most are monoecious
10
Q
what are flame cells
A
remove water and nitrogen waste
11
Q
what does their nervous system consist of
A
pair of anterior ganglia (cephalization)
and longitudinal nerve cords
12
Q
what are auricles
A
tactile (touch), chemorecepive cells
13
Q
what are ocelli
A
eyespots
light sensitive
