Phylum Cnidaria

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1

What is the most simple metazoan?

Cnhidarians

2

What type of body symmetry do Cnidarians have?

Radial (some biradial)

3

oral-aboral axis

axis in which radiate body parts are arranged around

4

What level of organization do Cnidarias have?

tissue

5

What are the classes of Cnidarians?

-Staurozoa
-Anthozoa
-Scyphozoa
-Cubozoa
-Hydrozoa

6

How many species of Staurozoa are there?

50

7

How many species of Cubozoa are there?

10

8

How many species of Anthozoa are there?

6000

9

How many species of Hydrozoa are there?

2700

10

How many species of Scyphozoa are there?

150

11

Which classes have a medusoid body form?

-Scyphozoa
-Cubozoa
-Hydrozoa

12

Which classes exist only in a medusoid body form?

-Scyphozoa
-Cubozoa

13

Which classes have an alternation of generations between medusoid and polyp forms?

Hydrozoa

14

Which class has hexaradial or octaradial symmetry?

Anthozoa

15

Which class exhibits strobilation?

Scyphozoa

16

Are Cnidarians diploblastic or triploblastic?

diploblastic

17

What germ layers do Cnidarians have?

endoderm and ectoderm

18

Are germ layers adaptive or derived in Cnidarians?

adaptive

19

Is the gastrovascular cavity of Cnidarians complete?

no

20

Are Cnidarians protostomes or dueterostomes?

protostomes?

21

What type of skeleton do Cnidarians tend to have?

hydrostatic

22

How does the gastrovascular cavity open to the environment?

mouth

23

What is the sister phylum of Cnidarians?

Ctenophora

24

What are Ctenophora?

comb jellies

25

What are Ctenophora and Cnidaria grouped together as?

Radiate phyla

26

What is a big difference between Ctenophora and Cnidaria?

Cnidaria have cnidocytes and dimorphism is common in them

27

cnidocytes

stinging cells

28

dimorphism

presence in a species of more than morphological kind of individual
-polyp and medusa

29

What is another name for the polyp form?

hydroid form

30

How do polyps move?

they don't (sessile)

31

What is another name for the medusa form?

jellyfish form

32

What type of movement do medusa have?

free swimming

33

What class is considered the "true jellies"?

scyphozoans

34

How do polyps reproduce?

asexually

35

How do medusa reproduce?

sexually

36

Are medusa diploid or haploid?

diploid

37

Are polyps diploid or haploid?

diploid

38

Are Cnidarian gametes diploid or haploid?

haploid

39

Why are hydras atypical of the class hyrdozoa?

no medusa stage

40

Do hydra live in solitude or colonies?

solitude

41

Are hydras freshwater or marine?

freshwater

42

Is obelia marine or freshwater?

marine

43

Do Obelia live in solitude or colonies?

colonies

44

Are Obelia polyps or medusa bigger?

polyps

45

Which species of hydrozoa are more plantlike or animal-like in appearence?

Obelia

46

Is Gonionemus freshwater or marine?

marine

47

Are Gonionemus polyps or medusa bigger?

medusa

48

How are medusa produced?

Asexual budding

49

Where are hydras found?

pools, quiet springs, and spring ponds--- underneath vegetation

50

hypostome

conical area surrounded by tentacles that bears the mouth

51

Where are the testes located in a hydra?

bud on its side at the oral end

52

operculum

tiny lid of a cnidocyte that pops off when the nematocyst discharges

53

mesoglea

thin, jelly like layer that acts as an elastic skeleton and provides strength and flexibility

54

Where does extracellular digestion begin?

gastrodermis

55

cnidocils

tiny hairlike triggers projecting from nematocytes,help discharge the nematocyst

56

What structure gives a warty appearance on the surface of the tentacles?

cnidocytes

57

basal disc

how a hydra sticks to surfaces- on the aboral surface

58

nematocytes

stinging organelle of a cnidocyte

59

Which cells develop to replace cnidocytes?

interstitial cells

60

What type of cells make up the epidermis of hydra?

epitheliomuscular cells

61

Where is the nerve net located?

Right below the epidermal layer

62

intersitial cells

small dark embryonic cells that can be found at the bases of epitheliomuscular cells

63

gland cells

secrete mucus onto the body

64

mesoglea

noncellular layer between the epidermis and gastrodermis, elastic skeleton

65

What do nutritive-muscular cells do?

-allow the hydra to change shape
-engulf food
-discharge enzymes to the gastrovascular cavity
-cilia keep food circulating

66

What cells make up the gastrodermis?

nutritive-muscular cells

67

What cells are found in both the epidermis and gastrodermis?

sensory cells

68

monoecious

organism has both male and female reproductive parts

69

dioecious

organism is either male or female

70

Where are sex organs found in hydra?

epidermis

71

What do testes contain?

spermatazoa

72

What side of a hydra are the ovaries found?

the basal end

73

Where does a hydra zygote form?

attached to the parent

74

dimorphic

having multiple stages (both polyp and medusa)

75

What does an Obelia colony arise from?

planula larva

76

stolon

rootlike fixture used for attachment

77

coenosarc

the living part of the colony

78

What secretes the persarc?

the epidermis

79

perisarc

thin, protective covering of the coensarc

80

zooids

another name for a polyp

81

hydranths

nutritive polyps

82

gongangia

reproductive polyps

83

Which polyp of Obelia have tentacles

hydranths

84

mudusae buds

grow on a stalk in the gongangia

85

pore in the gongangia young medusae escape from

gonopore

86

found in protected costal and bay areas

Gonionemus

87

hydrozoan medusae

hyrdromedusae

88

jellyfish of the class Scyphozoa

syphomedusae

89

convex/aboral surface fof a medusae

exumbrella

90

concave (oral) surface of a medusae

subumbrella

91

make and store nemocysts, help in extracellular digestion, act as sensory organs

tentacular bulb

92

organs of equilibrium, little sacs containing calcareous secretions

statocysts

93

circular shelflike membrane that aids in subumbrellar movement

velum

94

suspended from the central surface of the subumbrellar cavity with the mouth at the distal end

manubrium

95

surrounds the mouth (x4)

oral lobes

96

Wht does the gastrovasuclar cavity contain?

gullet, stomach, four radial canals,ring canal

97

is the mesoglea thicker in the medusa or hydroi form?

medusa

98

moon jelly

Aurelia auria

99

Is the mesoglea thicker in hydromedusae or scyphomedusae?

scyphomedusae

100

lacks a velum

Scyphozoans

101

body arranged uun multiples of 4

syphomedusae

102

teramerous radial symmetry

arranged in furs

103

Are scyphozoans monoiceous or diecous?

dieoucous

104

Where d embryos develop in scyphozoans?

oral arms

105

planula larvae

larvae of sscyphozoans, free swimming

106

substratum

where planular larvae attach to mature

107

scyphozoan polyps

scyphistomae

108

buds off youn scyphoxzoan medusae

stobila

109

young scyphozoan medusae

ephyrae

110

lion's mane jellyfish

cyanea capiltata

111

sea wasp

Chironex fleckeri

112

sense organ containing a statacyst and ocellus

rhopalium

113

flanks the rhopalium

lappet

114

what are orl arms modifications of?

manubrium

115

where re the gonads located in scyphozoan medusae

gastric pouches

116

subgenitalpit

respiratory function

117

digestive canal that follows the outer margin

ring cnal

118

stomach and canal system that resembles a wheel

medusoid gut (scyphozoan)

119

What tye of digestion do scyphozoan medusae have?

intracellular and extracellular

120

What bis the most common sea anaenome on the Atlatic coast?

Metridium senile

121

What class lacks a medusa?

class anthozoa

122

anthozoan white thradlike structure containing nematocysts usded for defense?

acontia

123

3 regions of a sea anenomae

oral idsc, basal disc, cylindrical coulumn

124

smooth surfaced ciliated groove surrounding ananomae's mouth, circulates water

siphonoglyph

125

peristome

smooth space between the outh and tentacles

126

primary septa

separates the gastrovasular cavity into 6 chambers

127

ananomoae gonads

resembles stacks of coins

128

what class does coral belong to?

anthozoa

129

rim of coral cup

theca

130

radial paritions within the theca

sclerosepta

131

Which class has both polyps and medusa, though one may supressed, velum presetnt

hydrozoa

132

true jellyfish, medusa dominant, no velum, solitary

scyphozoa

133

soliatry, no medusa, clusters of 8 bdy plan

staurozoa

134

solitary, reduced polyp, square medusa cross section, no velum but has a velarium

cubozoa

135

all polyps, no medusae, gastrovasular caivities separated by mesentaries

anthozoa


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