1 cnidaria

Question 1

phylum cnidaria

Answer 1

jellyfish, corals, anemones and hyroid colonies; radially symmetrical around an oral-aboral axis

Question 2

two basic designs

Answer 2

polyp (attached) and medusa (free swimming)

Question 3

Cnidaria ussually form in?

Answer 3

colonies; individuals in a colony are referred as zooids; each zooid has a specific function in a process called polymorphism

Question 4

2 epithelial layers

Answer 4

epidermis (outside) and gastrodermis (lines coelenteron)

Question 5

coelenteron

Answer 5

also known as gastrovascular cavity; only has one opening that functions as mouth and anus

Question 6

between both epithelial layers?

Answer 6

mesoglea; gelatinous extracellular matrix

Question 7

cnidocytes

Answer 7

essential for defense and food capture; stinging; houses cnida

Question 8

cnida

Answer 8

fluid filled compartment with a tubule invagination that can be rapidly everted if stimulated

Question 9

subphylum medusozoa

Answer 9

all cnidarians with a medusa stage

Question 10

2 classes of medusozoa

Answer 10

scyphozoa and hydrozoa

Question 11

scyphozoa

Answer 11

true jellyfish

Question 12

bell

Answer 12

umbrella; large relatively flat disc with mouth parts hanging below

Question 13

subumbrella

Answer 13

lower or oral surface of the bell; bears the mouth

Question 14

exumbrella

Answer 14

opposite or topside; aboral

Question 15

oral-aboral axis

Answer 15

axis of symmetry

Question 16

rhopalia

Answer 16

sensory complices located in the indentions created by symmetry

Question 17

life stages of aurelia aurita

Answer 17

planula(planktonic), scyphistoma(benthic), strobila(benthic) and ephyra(planktonic; in that order

Question 18

hyrda

Answer 18

medusazoa that does not have a medusa stage

Question 19

gastrozooids

Answer 19

responsible for feeding

Question 20

gonozooids

Answer 20

responsible for reproduction by producing medusae

Question 21

periderm

Answer 21

transparent chitinous exoskeleton for stems stolons and polyps

Question 22

coenosarc

Answer 22

living tissue inside of periderm

Question 23

Class anthozoa

Answer 23

only polyps; no medusa stage;

Question 24

know page 26

Answer 24

know it!

Question 25

phylum ctenophora

Answer 25

comb jellies; move by cilia; have collocytes(cells that stick to prey); have anal pores; biradially symmetrical

Question 26

biradial symmetry

Answer 26

two planes of symmetry; pharyngeal and tentacular plane