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Flashcards in Cnidaria Deck (18)
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1

What creates are in the cnidaria phylum?

Jellysofh and corals

2

How many species?

10 000

3

What symmetry do they display?

Radial

4

Diplo or triplo blastic?

Diplo

5

What are the common features?

Simple form, mouth =anus, No brain but simple NS
contractile bundles of microtubules act like muscles

6

What are the two forms?

Medusa - mouth down and Polyp

7

What clade do they belong to?

Eumetozoa

8

What is the basic body plan?

Central gastrovascular cavity, single opening

9

What mode of life in polyps?

Sessile, adhere to substrate by aboral end

10

What mode of life in medusa?

Motile, moves by drifting and contraction

11

How do they feed?

Carnivores, use tentacles and mouth to catch prey

12

What are cnydocytes?

Cells unique to cnidarians that function in prey capture - contain cnidae, capsule like organelles that are capable of exploding out

13

What are nematocysts?

Specialised cnidae that contain stinging thread to paralyse

14

What are the 4 classes?

Hydrozoans, scyphozoans, cubozoans, anthozoans

15

Describe the Hydrozoans

alternate between forms, some found in freshwater, reproduce sexually and asexually, very diverse group

16

Describe the Scyphozoans

medusa generally dominant - known as true jellyfish, some go through stage as small polyps

17

Describe the Cubozoans

box shaped medusa stage. complex eyes embedded in the fringe, compositely strong swimmers, highly toxic

18

Describe the anthozoans

Anenomes and corals, occur as polyps, solitary or colonial, may secret carbonate skeleton