Echinoderms
Like the scarecrow from the Wizard of Oz, an echinoderm lacks this.
What is a brain?
Most sea stars have a multiple of this number of arms.
What is 5?
This is a common nickname for a crinoid.
What is sea lily or feather star?
This sausage-shaped echinoderm spills its guts to ward off predators.
What is a sea cucumber?
Echinoderms are considered to be this because they crawl on the seafloor.
What is benthic?
This part of a sea star's body goes outside the mouth to engulf prey.
What is a stomach?
Brittle stars and crinoids feed at night, which means they are this.
What is nocturnal?
Instead of arms, this echinoderm is covered with spiky spines.
What is a sea urchin?
An echinoderm uses suction from this part of their body to move.
What are tube feet?
Human : blood vessels :: Sea star : _____ vessels.
What is water?
This is a large type of brittle star that is often mistaken for a plant.
What is a basket star?
The outer "shell" of a sand dollar is called this.
What is a test?
This is the term for an echinoderm's ability to regrow torn off body parts.
What is regeneration?
A sea star's favorite food belongs to this group of mollusks.
What is a bivalve?
A crinoid's arms used to catch plankton are called this.
What are pinnules?
Plankton and other debris travel through these to get to a sand dollar's mouth.
What are food grooves?
The word "echinoderm" means this. (2 words)
What is spiny skin?
A sea star's body is arranged around a fixed point, giving it a radial form of this.
What is symmetry?
A crinoid's bottom feelers used to cling or crawl are called this.
What are cirri?
This type of echinoderm has spine tips that release a harmful poison.
What is a hatpin urchin?