Porifera
Sponges are the simplest of all the animals. One of the ways we know this is that they exhibit this type of symmetry.
What is asymmetry?
Ouch! These are the tiny stinging capsules found in the tentacles of all cnidarians.
What are nematocysts?
This group of arthropods might be the most delicious if you like to eat seafood. It contains crabs, shrimp, and lobsters. Yum!
What are crustaceans?
Sea stars are able to move around by using their water vascular system to power these tiny appendages.
What are tube feet?
You might want to write this one down! Squids do not have an external shell like some other mollusks but instead have this internal, reduced shell used for structure and buoyancy.
What is a pen?
Sponges do not have a skeleton, but they do have these microscopic structures that can be made of silica or calcium carbonate and help support the sponge.
What are spicules?
These cnidarians are given their name because of the shape they resemble when viewed from above. Watch out for their deadly tentacles in groups of 4!
What are box jellyfish?
This is the type of symmetry that arthropods have.
What is bilateral symmetry?
This is the scientific class of echinoderms that contains starfish or sea stars.
What is asteroidea?
This class of mollusks contains animals with the most complex nervous systems of any of the invertebrates. They are probably the smartest too!
What are cephalopods?
This type of sponge is sold commercially and used to be the primary way people would wash their dishes or themselves.
Not every cnidarian is able to freely swim around the ocean. Corals are sessile and anchored in one place making them permanently in this stage of a cnidarians life.
What is the polyp stage?
This is the process that occurs when an arthropod sheds its exoskeleton in order to grow larger in size. Soft shelled crab anyone?
What is molting?
This is another word for the large hardened and fused casing of sand dollars and sea urchins. Hopefully this question will help you pass!
What is a test?
In bivalves this structure is used for gas exchange. But in cephalopods is is modified to be used for a quick escape sometimes accompanied with a cloud of ink.
What is a siphon?
These are the openings found at the top of a sponge where water is pushed out like a chimney after it passes through the sponge.
What is the osculum?
This is the scientific class of cnidarians that contains the "true" jellyfish
What is scyphozoa?
The term arthropod is actually Latin and means this.
What is jointed foot?
This group of echinoderms contains animals that have no organs in their arms, keeping them instead inside their central disc. Careful or you might break an arm off!
What are brittle stars?
This is the structure used by snails and other gastropods to grind up food and help them eat.
What is a radula?
These are the "wandering cells" in a sponge that can secrete spicules and spongin and have the ability to become any other cell in the sponge.
What are amoebocytes?
This is the scientific class that contains stony corals and anemones.
What is anthozoa?
Horseshoe crabs are actually an arthropod and are the closest marine relative to this group of land arthropods.
What are spiders?
This is the opening in the aboral side of an echinoderm where water is filtered and enters the water vascular system.
What is the madreporite?
This rare octopus is a master of disguise. But what makes it unique is that it can not only change color and shape but also behavior to imitate fish and even sea snakes.
What is the Indonesian Mimic Octopus?