Invertebrates

Question 0

Cnidaria

Answer 0

Hydra, jellies, corals, sea anemones

Nematocysts stored in cnidocytes, diploblastic, radial symmetry, gastrovascular cavity

Question 1

Porifera

Answer 1

Sponges

Basal, lack true tissues, flagellated cell conglomeration

Question 2

Platyhelminthes

Answer 2

Flatworms incl. flukes, tapeworms

Dorsoventrally flattened, unsegmented acoelomates, gastrovascular cavity or no digestive tract

Question 3

Rotifera

Answer 3

Rotifers

Pseudocoelomates, digestive tube

Question 4

Lophophorates

Answer 4

Ectoprocts, brachiopoda

Coelomates with feeding ciliates tentacles (lophophores)

Question 5

Mollusca

Answer 5

Gastropoda, bivalves, Cephalopoda

Coelomates with foot, visceral mass, mantle, reduced coelom

Question 6

Annelida

Answer 6

Polychaetes (marine worms), oligochaetes (earthworms)

Segmented body wall, internal organs

Question 7

Nemotoda

Answer 7

Roundworms

Pseudocoelomates, no circulatory system, shed

Question 8

Arthropoda

Answer 8

Crustaceans, insects, myriapods, chelicerates

Coelomates, segmented body, jointed appendages, exoskeleton of protein and chitin

Question 9

Echinodermata

Answer 9

Holothuroidea (sea cucumbers), Crinoidea (lilies, feather stars), Echinoidea (urchins, dollars), Asteroidea (stars and daisies), Ophiuroidea (brittle stars)

Bilateral symmetry in larvae and adult, water vascular system, endoskeleton