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Zoo 250 > Cnidaria > Flashcards

Cnidaria Flashcards

1
Q

Cnidaria

A

Hydrozoa, Scyphozoa, Anthozoa
Diploblastic, (hydroids, anemones, jellyfish) Radial symmetric (oral to aboral) , Polyp(benthic) and Medusa (pelagic), Hydrostatic skeleton,
Mesoglea, Nematocysts

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2
Q

Hydrozoa

A

Has polyp and medusa stages
Alternating generations
Hypostome, Tentacles, basal disk, epithelio muscular cells, gastrodermis, cnidocytes, tentacles, velum, manubrium, radial canal, mesoglea, gastrozoid, gonozoid
No Anus

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3
Q

Hydrozoa Medusa and Polyp stage

A

Medusae- usually small velum present simple bell margin, small maubrium lacking nematocysts, simple budding
Polyp- mouth is a simple opening, simple gastrovascular cavity, nematocysts absent in gastrodermis

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4
Q

Hydrozoa orders

A 
Anthomedusae (Hydra)
Leptomedusae (Obelia)
Siphonophora (physalia)
Limnomedusae (Gonionemus)
Milleporina (Millepora)
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5
Q

Hypostome

A

Feeding (mouth) (Hydra)

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6
Q

Tentacles

A

Feeding and catching food (Hydra)

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7
Q

Basal disk

A

keeps hydra benthic gliding along the bottom

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8
Q

Epithelio- muscular cells

A

muscular contraction and protection

Hydra

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9
Q

Gastrodermis

A

Hydra
Layer lining the GVC
Nutritive-Muscular Cells and Gland Cells

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10
Q

Cnidocytes

A

cells that contain the stinging organelle’s nematocysts

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11
Q

Does hydra have an exoskeleton?

A

No

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12
Q

Nematocyte

A

subcellular organism

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13
Q

Tentacles

A

Gonionemus

catching food

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14
Q

Manubrium

A

Gonionemus

tubular structure - contains mouth

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15
Q

Velum

A

Gonionemus
the lip in the center
used for swimming

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16
Q

Radial canals

A

water movement

17
Q

Mesoglea

A

Hydra
found between the epidermis and gastrodermis
thickest in stalk (column)-strength
thinnest in tentacles- flexibility

18
Q

How many radial canals do Gonionemus have?

A

4

19
Q

Gastrozooid

A

Catching food and feeding

Obelia

20
Q

Obelia

A

Hydrozoan
marine benthic and colonial
Has an exoskeleton

21
Q

Gonozooid

A

gonads and reproduction

22
Q

Scyphozoa

A

‘True Jellyfish’- Hermaphroditic
Medusa form dominant
Thick mesogleal layer
8 lobed larval medusa (ephyra)

23
Q

Gastric pouches

A

digestion

24
Q

Radial Canals

A

water vascular system

25
Q

Mesoglea

A

found between 2 epithelial cell layers

26
Q

Rhopalia

A

sensory structure

Aurelia - Scyphozoa

27
Q

Planular larvae

A

First Larva stage

Free swimming

28
Q

Scyphistoma

A

Sessile, larval (non-reproductive) stage of Aurelia

29
Q

Ephyra

A

ephyra is a non-reproductive life stage of Aurelia that comes just before the sexually reproducing medusa life stage

30
Q

Strobilation

A

Aurelia

Asexual reproduction - polyp form segmentation

31
Q

Anthozoa

A

No medusa stage– Anemone

Pedal disc- sedentary

Zoo 250 (3 decks)

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