Daily Activity 4-12-2012

• Get out your notebooks and be prepared to take notes on Cnidaria.

Phylum PoriferaSponges

Phylum Cnidaria 

Jellyfish, corals .....

• Don’t forget – sponges are animals and belong to the Animal Kingdom

1. Multicellular2. No organs or body systems3 . Cellular digestion (heterotrophic)4. Asymmetry

Sponges are SESSILE – they do not move

They obtain food by FILTER FEEDING

Reproduce sexually (sperm and eggs)Reproduce asexually (regeneration)Skeleton composed of spongin (soft) and spicules (hard)

Sponge Anatomy

Amebocytes - cells within the sponge that move around supplying nutrients and taking away waste

Pacific Northwest Locals

Purple Sponge

Cnidarians  -  jellyfish, coral, hydra, sea anemone

*Named after the stinging cells found on their tentacles called CNIDOCYTES

Characteristics of Cnidarians

· Tentacles· Cnidocytes (stinging cells)

· Nematocysts (barbs)· Gastrovascular cavity (digestion)

Most Cnidarians have radial symmetry

Cnidarians have two body forms:polyp (vase shaped)               medusa (cup shaped)

Portuguese Man of War - cnidarian that floats in the water and has long tentacles

Pacific Northwest Locals

Egg Yolk Jellyfish

Giant Lion’s Mane Jellyfish

http://www.calvintang.com/blog/2007/06/giant-jellyfish

Fish Eating Anemone

Crimson Anemone

White Spotted Rose Anemone

The Hydra is a freshwater cnidarian

What kind of symmetry does hydra have?Is it a medusa or a polyp?

Hydra

• Predatory animals

• They can be found in most unpolluted fresh-water ponds, lakes, and streams in the temperate and tropical regions and can be found by gently sweeping a collecting net through weedy areas.

• Hydras are generally sedentary or sessile, but do occasionally move quite readily, especially when hunting.

Video of hydra at http://www.microscopyu.com/moviegallery/pondscum/hydra/

Pacific Northwest Locals

Pink Mouth Hydroid

Coral Reefs are made from the skeletons of cnidarians

Pacific Northwest Locals

Cup CoralSoft Coral

Multimedia

Sponge Images and Videos - http://www.junglewalk.com/video/Sponge-movie.htm 

Cnidarian Images and Videos - http://www.junglewalk.com/video/Coelantrate-movie.htm

General Invertebrate Movies at National Geographic --- really good video on the portuguese man of war (under invertebrates) Hydra Video at  http://www.schooltube.com/video/55045/Hydra