Porifera
These tiny openings allow water to enter a sponge's body.
What are ostia?
All cnidarians share this type of body symmetry
What is radial symmetry?
Most mollucs have this structure that secretes a calcium carbonate shell.
What is the mantle?
The hard exoskeleton of arthropods is made of this material
What is chitin?
Adult echinoderms show this type of symmetry based on the number 5.
What is pentaradial symmetry?
This large opening lets water exit a sponge.
What is the osculum?
These are the two main body forms of cnidarians.
What are the polyp and medusa?
Clams, oysters, and scallops belong to this class of mollusks.
What is bivalvia?
Arthropods must do this to grow larger.
What is molting?
This system of canals and tube feet allows echinoderms to move around and feed.
What is the water vascular system?
These flagellated cells create water currents and trap food.
What are choanocytes or collar cells?
These stinging structures are used for capturing prey and defense.
What are nematocysts?
Most mollusks (except bivalves) use this structure to scrape or cut food.
What is the radula?
A typical crustacean has an abdomen and this body region made up of a fused head and thorax.
What is a cephalothorax?
Water enters an echinoderm's body through this structure.
What is the madreporite?
A sponge's skeleton is supported by these structures.
What are spicules?
In most jellyfish, this body form is the sexual stage that releases gametes.
What is the medusa?
Cephalopods move by jet propulsion using this structure and often release ink through it.
What is the siphon?
These ancient marine arthropods are closely related to spiders.
What are horseshoe crabs?
Sea urchins and sand dollars belong to this echinoderm class.
What is Echinoidea?
Sponges can reproduce by budding or fragmentation. This is an example of what kind of reproduction?
What is asexual reproduction?
Coral polyps rely on t his photosynthetic partner that lives in their tissues.
What are zooxanthellae?
In squids, the mantle secretes this structure, which is a reduced form of a shell.
What is the pen?
The word arthropod literally translates to this.
What is jointed foot?
What is the sea cucumber?