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Cniderians/Sponges Vocab
Vocabulary for the phyla Cnideria
18
Biology
7th Grade
04/25/2010

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Term
Radial Symmetry
Definition
~Pie-divided
~ Equal sections of more then 2 that all are the same
Term
Vertebrates
Definition
Have a backbone
Term
Invertebrates
Definition
Don't have a backbone
(ex: Jellyfish)
Term
Marine
Definition
Salt water habitat
Term
Asymmetrical
Definition
Lacking symmetry
Term
Ostia
Definition
Pores or holes on the side of a sponge
Term
Filter Feeders
Definition
Animals that use Ostia to filter the food and get nutrients
Term
Covering Cells
Definition
Outer layer of cells on sponges
Thin and Flat
Term
Collar Cells
Definition
Inner layer of cells on a sponge
Have flagella on them
Term
Wandering Cells
Definition
Inbetween jellylike layer of cells on sponges
Carries food and water through the cell
Term
Budding
Definition
The parent sponge grows an outgrowth that will become a new sponge
Term
Regeneration
Definition
The ability to grow back body parts that are cut off
Term
Spicules
Definition
Needlelike support in the middle layer of sponge cells
Link together to form a simple skeleton to shape the sponge
Term
Osculum
Definition
Large opening at the top of a sponge
Term
Cnidocytes
Definition
Stinging cells
(On the tentacles)
Term
Nematocysts
Definition
The poison arrow like structure that shoots out at prey
(in cnidocytes)
Term
Medussa
Definition
Form of cniderian that can float about and move
Term
Polyp
Definition
Form of cniderian that cannot move and is connected to the floor bottom
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