Cnidarian
Basics
Basics
These animals have ______ symmetry, meaning body parts are arranged around a central axis.
What is Radial Symmetry
Cnidarians capture their prey using these structures covered with stinging cells
What are tentacles with cnidocytes?
The name “Porifera” means this
What is 'bearing pores'?
The gel-like layer inside sponges where amoebocytes move around.
What is the mesohyl?
The two main cnidarian body forms are this cylindrical sessile stage and this bell-shaped free-swimming stage.
What are polyp and medusa.
This central digestive cavity also helps with circulation in cnidarians
What is the gastrovascular cavity?
Most sponges are sessile, meaning they live this kind of lifestyle.
What is sessile?
Sponges can reproduce asexually by budding, fragmentation, or these dormant survival structures.
What are gemmules?
Specialized stinging cells that cnidarians use to capture prey.
what are cnidocytes
Many cnidarians reproduce asexually through these processes, while also reproducing sexually with gametes.
What is budding or fragmentation
Sponges feed by drawing water through pores using these specialized collar cells
What are choanocytes?
The three body types of sponges from simplest to most complex.
What are asconoid, syconoid, and leuconoid?
Inside each cnidocyte, this capsule structure delivers venom
what is a nematocyst
The class Anthozoa contains only this body form
What is the polyp form
These tiny pores(openings) allow water to enter the sponge’s body
What are ostia?
This adaptation allows sponges to regenerate if broken apart.
What is fragmentation?
Name the four main classes of cnidarians and give an example of each
What are Hydrozoa (hydras, Portuguese Man-of-War), Scyphozoa (true jellyfish), Cubozoa (box jellyfish), Anthozoa (corals, sea anemones)
These reef-building organisms provide habitat, biodiversity, and coastal protection.
What are coral reefs?
This large opening is where water exits the sponge’s body
What is the osculum
These cells digest food, transport nutrients, and produce spicules or spongin
What are amoebocytes?