Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

8 Cards in this Set

  • Front
  • Back
What is a Lophophor? Which Phylum possesses the Lophophorate structure?
A feeding structure that is a retractable ring of tentacles covered with cilia that circulate water to and from the mouth.
P. Bryozoan
How many classes are in Phylum Echinodermata?
1. C. Asteroidea (sea stars)
2. C. Crinoidea (sea lillies)
3. C. Echinoidea (urchins)
4. C. Holothuroidea (cucumber
5. C. Ophiuroidea (brittle stars)
What are the 3 major characteristics of Phylum Echinodermata?
1. Penamaerous; secondary radial system (holothuroidea)
2. Endoskeleton calcareous ossicles; collagen
3. WVS derived from coelom.
What is a water vascual system (WVS) and which Phyla contain it?
hydraulic system used by echinoderms, such as starfish and sea urchins, for locomotion, food, waste transportation and respiration.
P. Echinodermata
Name the functions of a WVS
*Respiration (no gills)
*Ammonia transport and diffusion (no excretion system)
*Circulation (especially nutrient transport)
*Locomotion and holding (tube feet)
How do the tube feet of a starfish operate?
Force is conserved and transferred by incompressible fluid closed system (WVS coelomic space).
How does a WVS work?
Water enters the madreporite and flows through the stone canal to the circular ring canal. Water is then separated into five radial canals that branch into ampullae. The ampullae are connected to the tube feet. Contraction of the ampullae causes the podia to stretch as water is brought into them.
Although Echinoderms have pentaradial symmetry, what is the symmetry of the animals they evolved from?