Bio 2.2 Cnidaria

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What symmetry do organisms in this phylum have?

Radial
Cnidocytes

Stinging cells
What level of organization are these organisms?

Tissue
Polyp Body Type

Attached and sessile
Medusa Body Type

Free-swimming
How many embryonic layers does this phylum have?

Two (diploblastic): endoderm and ectoderm
Triploblastic

Three embryonic layers: endoderm, ectoderm and mesoderm
Incomplete Gut
- Formed by endoderm.
- There is only one opening that serves as both the mouth and the anus.
Gastrovascular Cavity

Functions as both the digestive system and the transport system.
Mesoglea

Glycoprotein holding the tissues together.
What are the three main classes of cnidaria?
- Hydrozoa
- Scyphozoa
- Anthozoa
Hydrozoa
- Go through both polyp and medusa stages.
- Medusae have velum, which is a shape-holding ring of tissue at the bottom of the exumbrella.
- Ex: Obelia
Scyphozoa
- Medusa stage only.
- Ex: Aurelia
Anthozoa
- Polyp stage only.
- Solitary or colonial.
- Ex: Metridium
Name the parts of this image of Aurelia:
Oral Arms
Mouth
Gonads
Tentacles
Cnidocytes
Exumbrella
Nematocysts

Filamentous organelles that are expelled from cnidocytes.
On the picture of the Aurelia life cycle, label the:
Strobila
Strobilates
Ephyras
In the picture of Aurelia Ephyra label:
Rhopalia

Define ocellus and statcyst.
- Ocellus: light sensation
- Statocyst: gravity sensation
What are polyp colonies called?

Hydroids
In the Obelia picture, label (and define):
Coenosarcs
Hydranth
Gonangium
- Hydranth: Feeding polyp
- Gonangium: Reproductive polyp
Hermatypic

Corals that harbor symbiotic algae.

Small polyps, create huge coral reefs because they house their own food supply.
Ahermatypic

Corals that do not house ay photosynthetic symbionts.

Larger polyps.

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pugluv01

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Bio 2.2 Cnidaria

Description

Cnidaria

Updated

2013-01-31T01:46:47Z