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Question 1

ways Cnidaria can reproduce

Answer 1

sexually or asexually

Question 2

Cnidarian Classes who have both medusa and polyp life stages

Answer 2

Scyphozoa, Cubozoa, and Hydrozoa

Question 3

Cnidarian Class that only has a polyp life stage (no medusa)

Answer 3

Anthozoa

Question 4

known as “box jellies”

Answer 4

Class Cubozoa

Question 5

mating system of Cubozoa

Answer 5

males actively transfer sperm to females

Question 6

characteristics of Cubozoa

Answer 6

very deadly, active swimming hunters, have “eyes” (but no CNS)

Question 7

known as “true jellies”

Answer 7

Class Scyphozoa

Question 8

characteristics of Scyphozoa

Answer 8

200 known species, most are small, can be predators or filter feeders, tetraradial symmetry, males and females not dimorphic, long tentacles and ribbon-like oral arms for feeding

Question 9

colonial animals within Cnidaria

Answer 9

Class Hydrozoa

Question 10

characteristics of Hydrozoa

Answer 10

3600 known species, high morphological diversity, mostly colonial

Question 11

individuals of a Hydrozoan colony

Answer 11

zooids

Question 12

contains anemones and corals

Answer 12

Class Anthozoa

Question 13

characteristics of Anthozoa

Answer 13

6000 known species, hexamerous/octamerous symmetry,, no medusa stage, complex gastrovascular cavity

Question 14

characteristics of coral

Answer 14

colonial, made of many polyps that create an exoskeleton from calcium and carbonate in the water, contain symbiotic dinoflagellate algae, bleach algae when stressed

Question 15

potential ancestor to all triploblasts

Answer 15

Phylum Xenacoelomorpha

Question 16

characteristics of Xenacoelomorpha

Answer 16

small marine flatworms, 400 known species, simple morphology, blind gut, no complex organ systems or CNS

Question 17

characteristics of Phylum Lophotrochazoa

Answer 17

spiral cleavage

Question 18

important phyla within Platyzoa (which is within Lophotrochazoa)

Answer 18

Platyhelminthes, Rotifera, and Acanthocephala

Question 19

characteristics shared by Rotifera and Acanthocephala

Answer 19

complex nervous system (brains!), digestive system, excretory system, no circulatory or respiratory systems

Question 20

characteristics of Rotifera

Answer 20

2200 species, globally distrubuted, mostly freshwater, ciliated corona, advanced morphology, both sexual and parthenogenetic reproduction

Question 21

parthenogenetic reproduction

Answer 21

when females produce fertilized eggs by themselves

Question 22

how the “mouth” of Rotifera works

Answer 22

cilia surrounding corona beat to draw in food, which is then “chewed” by the mastax

Question 23

characteristics of Acanthocephala

Answer 23

thorny-headed worms, may be a type of Rotifera, 1100 species, all are parasitic, probiscus surrounding head, lives in intestine, globally distributed, sexually dimorphic, no digestive system

Question 24

general life cycle of Acanthocephala

Answer 24

breed inside of host, eggs are released into water and attach to algae, intermediate host eats algae and egg develops inside, definitive host eats intermediate host where Acanthocephala lives out its life