Day 15 Echinodermata
Echinoderms are the
Sea Stars
Sea Urchins
Sea Cucumbers
Echinodermata Characteristics
-Bilateral Symmetry as planktonic larvae
-Radial symmetry as adults
-Pentamerous radial symmetry
-No head, no anterior or posterior
-Instead we describe them as oral end and aboral end
-Complete digestive track
-Full coelom
-Internal skeleton (endoskeleton)
-Water Vascular system
-Tube feet
-Controlled by muscular sacs called ampullae
-Urchins and Sea Stars connect their water vascular system to the outside with a madreporite
Watch this video on the phylum echinodermata. Create a box in your sketchbook, title it "The Phylum Echinodermata" and take notes, write down interesting things that you learn from the video and include an image in your sketchbook. Make sure you understand the characteristics of echinoderms and can recognize the different classes.
Since we cover Echinodermata in depth in Marine Biology we will only review the classes of echinoderms here. If you did not take Marine Biology or would like to see more detail about the echinodermata class please visit the Echinodermata page of marine biology.
Class Asteroidea (Sea Stars)
This is an optional video that shows how echinoderm tube feet work.
Class Ophiurodea (Brittle Stars)
Class Echinoidea (Sea Urchins)
-Sand Dollars are a type of Echinoidea
Class Holothurodea (Sea Cucumbers)
Some random Echinoderm videos