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Invertebrate Biology > Quiz 2 - Phylum Cnidaria > Flashcards

Quiz 2 - Phylum Cnidaria Flashcards

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1
Q

What do interstitial cells (totipotent cells) do in cnidaria

A

Make gametes and cnidocytes

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2
Q

What are the receptor cells in cnidaria?

A

Sensory cilium

Make a loose nerve net

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3
Q

Epithilio-muscular cells function as skin and muscle in cnidaria. What do they contain that are longitudinal in the epidermis but circular in the gastrodermis?

A

Myofibrils

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4
Q

What class are the true jellyfish

A

Scyphozoa

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5
Q

What have a thick mesoglea, found mostly in the medusa stage, are active carnivores with a well developped gastrovascular cavity

A

Scyphozoa

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6
Q

What is the manubrium in scyphozoa?

A

Underside of the bell, stalk like structure that hangs down the centre, with the mouth at is tip

There are usually four arms attached to the manubrium

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7
Q

Explain the aurelia life cycle of class scyphozoa

A

Planula - scyphisotoma - stobilation - ephyra - medusa

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8
Q

Explain in detail the different stages of scyphozoa life cycle

A

Planula - fertilized eggs w cilia, that turn into a polyp, free swimming larva
Scyphistoma - asexul budding of the polyp, turns into a segmenting polyp
Strobilation - tentacles reabsorbed, body starts to narrow
Ephyra - baby medusa stage, start breaking off
Medusa - adult jellies, sexual

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9
Q

What class are the box jellies

A

Cubozoa

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10
Q

Whats a defining feature of cubozoa

A

4 tentacles from 4 corners

No stobilation!!!

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11
Q

What is different from class scyphozoa to class cubozoa in terms of their life cycles

A

Cubozoa- no strobilation

Mate by mono strobilation

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12
Q

What is the life cycle of cubozoa

A

Mate
Planula
Settle and form polyps
Medusa

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13
Q

What are the stalked jellyfish

A

Class staurozoa

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14
Q

What class has an attached medusa stage and no alteration of generation (aka direct development)?

A

Staurozoa

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15
Q

What class is found in mostly the polyp stage?

A

Hydrozoa

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16
Q

What is the life cycle of hydrozoa

A

Mate
Planula
Polyp
Asexual reproduction of polyp

17
Q

What class is the sea anemones and the corals

A

Anthozoans

18
Q

What class has no medusa stage and a divided gastrovascular cavity (coelentron)

A

Anthozoa - corals and anemones

19
Q

What class are good circular and longitudinal muscles

A

Anthozoa

20
Q

What is a scyphisotoma in scyphozoa

A

Segmented polyp after the planula stage, when the start budding

21
Q

What are the 5 main classes of jelly / cnidaira

A 
Scyphozoa
Cubozoa
Staurozoa
Hydrozoa
Anthozoa
22
Q

What are the soft corals classified under?

A

Subclass alcyonaria / octocorallia

23
Q

What are some characteristics of the octocorallia / alcyonaria

A

8 part symmetry
Soft coral / more mesoglea
Deep sea corals

24
Q

What is subclass zoantharia / hexacorallia

A

6 way symmetry anemones and hard corals

25
Q

What class are the hard corals

A

Hexacorallia

26
Q

What are the reef building corals (hermatypic) classified under

A

Hexacorallia/ zoantharia

27
Q

What is the life cycle of a coral

A 
Hermaphroditism 
Sexual or asexual 
Broadcast spawning - corals release gametes simultaneously 
Make planula - then polyp
Budding from oral disc / at base
28
Q

Where does coral budding happen

A

At the oral disc / at the base

29
Q

What is group myxozoa

A

Slime or mucus animals

Parasites of fish / invertebrates

30
Q

What are the two morphological forms of myxozoa

A

Motile worm and spore forming sacs

31
Q

Do myxozoams have a gut or a nervous system

A

Nope

32
Q

Bilateral symmetry is the presence of anterior posterior and dorsal ventral - but cnidarians show oral - aboral with their mouth (blastopore) on one end. How are they bilateral animals?

A

Shows bilateral expression during embryogenesis

Also, they have bilateral hox genes even though they lack morphological A-P axis

33
Q

What are the 2 major evolution events of cnidarians

A

Make axial properties

Form multilayered animals through gastrolation - endoderm and ectoderm

Invertebrate Biology (7 decks)

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