Echinoderms – Spiny Skin

Echinoderms – Spiny Skin

• Echinoderms movies

Echinoderms Are:

• Starfish

• Sea Lilies

• Feather Stars

• Basket Stars

• Sea Urchins

• Sea Cucumbers

• Sand Dollars

There are 5 characteristics:

• Radial Symmetry

• Spiny skin

• Internal skeleton

• Water vascular system

• Tube feet

• The internal skeleton of an echinoderm is made of calcium carbonate bony plates that are bumpy or spiny for protection.

• An echinoderm’s water vascular system is a system of canals that carry food and oxygen and remove wastes.

• The water vasuclar system also helps an echinoderm move.

Tube feet movie Tube feet movie 2

• Echinoderms have tube feet used for moving and getting food.

Reproduction

• Sexual

• Larva StageReproduction Movie

5 Class of Echinoderms

• Crinoidea- Sea Lillies

• Ophiuroidea- Brittle Stars

• Echinoidea- Sea Urchins and Sandollars

• Holothuroidea- Sea Cucumbers

• Asteriodea- Starfish

Crinoidea (kri-NOID-ee-uh)

• sea lilies and feather stars

• sessile and mobile

• 5 arms extend and branch

• tube feet filter feed and respire

• mouth faces up

Ophiuroidea (OH-fee-yoor-OID-ee-uh)

• long narrow, flexible arms – move quickly

basket stars

Echinoidea (EK-uh-NOID-ee-uh)

• sea urchins and sand dollars

• endoskeleton called test

• sea urchins eat by scraping algae with jaw-like Aristotle lantern

• Sand Dollars live along seacoasts

• short spines used for locomotion

sand dollars

Holothuroidea (HOH-loh-thuh-ROID-ee-uh)

• Sea Cucumbers– soft body

• Armless, they burrow

• Tube feet around mouth

Sea cucumbers movie

Sea Cucumber movie 2

Asteriodea (AS-tuh-ROID-ee-uh)• sea stars

• 5 to many arms

• A starfish is able to re-grow it’s arms.

• A starfish uses its tube feet to move and to open it’s food (bivalves).

Digestive Gland Reproductive Gland/Gonads

Starfish Eating

Canals and Stomach

Water Vascular System

Kingdom of Animals Invertebrates

• Porifera – Sponges• Flatworms – Turbellaria, Trematoda,,Cestoda• Roundworms- Nematoda• Rotifers• Mollusks – Gastropoda, Bivalves, Cephalopods• Annelida- Oligochaeta, Polychaeta, Hirudinea• Cnidarians- Hydrozoa, Scyphozoa, Anthozoa• Arthropods – Crustacians, Arachnids, Myriapods and

Insects• Echinoderms – Crinoidea, Ophiuroidea, Echinoidea,

Holothuroidea, Asteriodea.

Invertebrate Exam

• Be able to identify organisms by Phylum and Class/Order name.

• Know characteristics of organisms – reproduction, eating, body plan, special features, etc.

• Be able to identify structures off of dissections we have done.