Invertebrate Animals

Question 1

Porifera

Answer 1

sponges
- lack true tissues
- have choanocytes (collar cells)

Question 2

choanocytes

Answer 2

flagellated cells that ingest bacteria and tiny food particles)

Question 3

cnidaria

Answer 3

jellies, sea anemones
- unique stinging structures (nematocysts)
- radial symmetry
gastro vasc cavity (digestive comp. w/ one opening)

Question 4

Platyhelminthes

Answer 4

flatworms
- dorsoventrally flattened
- unsegmented acoelomates
- gastro vasc or no digestive tract

Question 5

rotifera

Answer 5

rotifers, pseudocoelomates
- alimentary canal (dig. w/ mouth and anus)

Question 6

lophophorates, ectoprocta, brachiopoda

Answer 6

coelomates with lophophores

Question 7

lophophorates

Answer 7

feeding structures bearing ciliated tentacles

Question 8

molluscs

Answer 8

clams, squids, snails
- coelamates w/ 3 body partsnema

Question 9

annelida

Answer 9

segmented worms
- coelomates w/ segmented body wall and internal organs

Question 10

nematoda

Answer 10

roundworms
- cylindrical, unsegmented psuedocoelomates w/ tapered ends

Question 11

arthropoda

Answer 11

crustaceans, insects, spiders

Question 12

echinoderma

Answer 12

sea stars, urchins
- coelomates with bilaterally symmetrical larvae and 5-part body organization

Question 13

chordata

Answer 13

lancelets, tunicates
- coelomates w/ notochord, dorsal nerve cord, pharygenal slits, post anal tail

Question 14

Protostome (3 things, 1 animal)

Answer 14

mollusks
1. They have a spiral cleavage of their embryos
2. determinate cleavage (fate of each embryonic cell is determined early on in cleavage process)
3. mouth develops from blastopore

Question 15

Deuterostome

Answer 15

echinoderms
1. They have radial cleavage of their embryos
2. indeterminate cleavage (each cell can be and embryo or stem cell)
3. Anus develops from a blastopore