Cnidarians

A phylum with over _____________ species of animals found exclusively in marine and aquatic environments

Named after the _______________________ found on their tentacles called _________________________

4 Classes1. ____________________________ Eg Hydra

2. -____________________________Eg. Jelly Fish

3. ____________________________Eg. Box Jelly Fish

4. ___________________________ Eg. Sea Anemones, Corals

Characteristics of Cnidarian

· Tentacles· Cnidocytes (____________________________________) Specialized cells used for capturing ____________

Specialized Cells - Nematocysts _________________ on stinging cells

Digestion

_________________ cavity used for digestion (Open digestive system)

Body Make up

Their bodies consist of ____________________, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one ___________________.

___________________- The Hydra is a freshwater cnidarian

Hydra- Named after the____________________________ (notice the resemblance)

WORD BANK

Gastrovascular cavity TentacleCnidocyteEctodermEndodermMesogleaOvary/TesteBudNematocystMouthBasal Disk

Cnidarins have 2 body forms - __________________________________

Body Symmetry- Most Cnidarians have _____________________________

Reproduction

Regeneration- All cnidarians can _______________________, allowing them to recover from injury and to reproduce ______________________. Medusas have limited ability to regenerate, but ___________________ can do so from small pieces or even collections of __________________. This enables corals to recover even after apparently being destroyed by predators.

Asexual- Cnidaria can reproduce _______________________in addition to regenerating. Hydrozoan polyps only ___________ while some medusas can _______________________________. Scyphozoan _______________ can both bud and split down the middle. In addition to both of these methods. Anthozoa can split ___________________just above the base

Sexual sexual reproduction often involves a complex _____________________with both polyp and medusa stages. For

example in Scyphozoa (jellyfish) a ______________swims until it finds a good site, and then becomes a ___________. This grows normally but then absorbs its tentacles and _________________ horizontally into a series of disks that become juvenile medusae, a process called _______________________. The juveniles swim off and slowly grow to maturity, while the polyp __________________ and may continue strobilating periodically.

The adults have ________________ in the gastroderm, and these release ova and sperm into the ______________in the breeding season.

Coral Reefs are made from ____________________ of Cnidarians