Tutorial: basal animals Flashcards
sponges have ____ tissue type
LACK true tissues
Cnidaria have ____ tissue type
2 (Diploblastic)
Porifera have ____ symmetry
asymmetrical
do Porifera have a body cavity
NO
what kind of development do Porifera have
ABSENT
do Porifera have segmentation
no
do Porifera have cephalization
NO
describe the digestive system of Porifera
- No gut = they are suspension feeders
describe the excretory system of Porifera
diffusion
describe the circulatory system of Porifera
Absent or by Diffusion
describe reproduction in Porifera
hermaphroditic
describe the nervous system in Porifera
absent
other key traits of Porifera
- have choanocytes (collar cells flagellated cells that ingest bacteria and
tiny food particles)
are there taxa in Porifera
NO
symmetry in Cnidaria
primarily radial
body cavity in Cnidaria
absent
development mode of Cnidaria
none
is there segmentation in Cnidaria
NO
is there cephalization in Cnidaria
very primitive or lacking
describe the digestive system of Cnidaria
gastrovascular cavity
describe the excretory system in Cnidaria
eliminates waste from GV cavity by amoebocytes
circulatory system in Cnidaria
absent
respiratory system in Cnidaria
absent or by diffusion
reproduction in Cnidaria
- polyps - asexual budding
- medusae - sexual reproduction
nervous system in Cnidaria
network of nerve cells
other key traits of Cnidaria
- two basic body plans (polyp and medusa)
- string structures (nematocysts) housed in cells called cnudocytes
taxa in Cnidaria
- Medusozoan (jellies, box jellies and hydrozoans)
- Anthozoans (sea anemones and corals)
