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Biology 1204 > Cnidaria > Flashcards

Cnidaria Flashcards

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1
Q

What typ of symmetry does Cnidaria have?

A

Radial or biradial symmetry

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2
Q

What are cnidaria known as?

A

Tissue grade of organization

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3
Q

How many germ layers do Cnidaria have?

A

Diploblastic - 2 germ layers

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4
Q

What specialized cells do Cnidaria have? And what are on these cells?

A

Cnidoblast cells = have nematocysts which are unique stinging organelles

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5
Q

What is the larva stage of the cycle of Cnidaria?

A

Planula (free-swimming and flatten body)

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6
Q

What are the 2 types of adult morphology of Cnidaria?

A

1- Polyp

2- Medusa

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7
Q

What is the example, movement and location of mouth of a polyp Cnidaria?

A

Hydroid
Sessil
Mouth at top end with tentacle surrounding it

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8
Q

What is the example, movement and location of mouth of a medusa Cnidaria?

A

Jellyfish
Float/free swimming = mobile
Mouth underneath with tentacles surrounding it

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9
Q

What are the 3 layers inside both polyp and medusa Cnidaria? In to out

A

Gastrodermis
Mesoglae
Epidermis

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10
Q

What are the 4 classes of Cnidaria?

A

1- Anthozoa
2- Scyphozoa
3- Hydrozoa
4- Cubozoa

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11
Q

What is the class Scyphozoa of Cnidaria known as? What contradicts this?

A

True jellyfish = all medusa

Have some polyp larval stage

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12
Q

What morphology does the class Cubozoa of Cnidaria have?

A

Medusa stage predominant

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13
Q

What is the morphology of the class Hydrozoa of Cnidaria?

A

Polyp and medusa in some spp

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14
Q

Where are the nematocysts found in the class Hydrozoa of Cnidaria?

A

Only in epidermis

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15
Q

How do the class Hydrozoa of Cnidaria reproduce? Called?

A

Asexual and sexual with separate sexes (gonochoristic or dioecious)

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16
Q

What are 4 examples of the class Anthozoa of Cnidaria?

A

Sea anemones
Corals
Sea pens
Sea fans

17
Q

What morphology is the class Anthozoa of Cnidaria?

A

All polyp = no medusa stage at all

18
Q

What doesn’t the class Anthozoa of Cnidaria have?

A

No operculum (gill cover) or cnidocil (nematocyst trigger)

19
Q

Describe the mitochondrial DNA of the class Anthozoa of Cnidaria?

A

Circular not linear

20
Q

What is coelenteron (central gastric cavity) divided by in the class Anthozoa of Cnidaria?

A

Septa (partition separating 2 chambers)

21
Q

The class Anthozoa of Cnidaria have a siphonoglyphy. Explain what this is

A

1-2 ciliated grooves extending down the pharynx (membrane lined cavity from nose to mouth) form the mouth

Biology 1204 (14 decks)

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