Zoology S2

What does Echinoderm mean?

Spiny skin.

What INTERNAL BODY PLAN do Echinoderms have?

Coelomates.

What type of symmetry to Echinoderms have when they are ADULTS?

Radial

What type of symmetry to Echinoderms have when they are LARVAE?

Bilateral

What are the 2 most important things that radial symmetry allows for the starfish to detect?

1.) Sensing food.

2.) Sensing predators.

Echinoderms were the first animal to have an ____________.

Endoskeleton

What does the MADREPORITE do for a sea star?

Acts as a strainer like opening into the water vascular system.

What do the tube feet on a starfish used for?

1.) Movement.

2.) Food collection.

3.) Respiration.

________ is a muscular sac found on the opposite end of the tube foot on a sea star.

Ampulla

What anatomical part is #1?

Radial Canal.

What feature is #2?

Madreporite.

What feature is #3?

Ampulla.

What feature is #4?

Tube Feet.

What feature is #5?

Stone Canal.

What feature is #6?

Ring Canal.

How does an Echinoderm take in oxygen?

Diffusion through the tube feet.

How are materials (like nutrients) moved through the body of the Echinoderm?

Water vascular system and coelom.

What type of digestive system does and Echinoderm have?

Complete digestive system.

How is the sea star able to digest food that is too big to fit into it’s mouth?

They push out their stomach onto or into their prey and allow the digestive enzymes to break their food down before consumption.

Define Pedicellariae.

Small pincers on the dorsal side that catch food and remove foreign material from skin.

Echinoderms use _______ to remove wastes from their body.

Diffusion.

How is the nervous system constructed in an Echinoderm?

A nerve ring surrounds the mouth with branching nerve cords.

Where are the eyespots located on an Echinoderm?

Tips of each arm.

Echinoderms cannot regulate their own body temperature. This makes them ________.

Ectotherms.

What body system do echinoderms use for location?

Movement is carried through the water vascular system.

What 2 ways can an ehinoderm reproduce?

• Sexually with external fertilization.

• Asexually with regeneration.

What are 2 mechanisms that echinoderms use to free themselves from predators?

• Dropping a limb.

• Dropping and internal organ.

Give an example of the following class of echinoderm: Asteroides.

Sea star.

Give an example of the following class of echinoderm: Ophiuroidea.

Brittle star.

Give an example of the following class of echinoderm: Echinoidea.

Sea urchins and Sand dollars.

Give an example of the following class of echinoderm: Crinoidea.

Sea lillies

Give an example of the following class of echinoderm: Holothuroidea.

Sea cucumber.

Give an example of the following class of echinoderm: Conentricycloidea.

Sea daisies.

Sea urchins and sea cucumbers are BIOTURBINATORS, what does that mean?

Stir up ocean floor sediment.

Compared to sea urchins and sea cucumbers, what happens to coral reef populations when crown-of-thorns sea star populations increase?

They feed on coral polyp. While their population increases, the coral reefs are destroyed.

Place in order the steps of an echinoderms water vascular system.

Radial Canal, Madreporite, ampulla, Ring canal, tube feet, Stone canal.

Madreporite, stone canal, Ring canal, radial Canal, ampulla, tube feet.

What is the major evolutionary contributing of anechinoderm?

Endoskeleton.