What does arthropod mean and give and example.
jointed foot -lobster, crab, shrimp, barnacles, copepods
Is this an arthropod?
Yes a decapod, even though it takes advantage of shells left behind from other animals
What kind of symmetry do echinoderms have?
radial-pentamerous
What do cuttlefish use chromatophores for?
camouflage
What s the common name for a gastropod, and what does gastropod mean?
Snails, Stomach-foot organisms, (coiled body organs sitting on a large muscular foot)
What does a sea urchin have to help it process hard to digest algae and sea grasses?
A long coiled gut (so do sea cucumbers, because they swallow sediment as they crawl along the ocean floor)
What do cephalopods use as a method of propulsion?
they expand thier mantle and draw in water, and then contract their mantle forcing the water out.
What is a Dorsal nerve chord?
A long bundle of nerves cells located along the dorsal part of an organism's body
What is a mollusks foot used for?
Locomotion, anchoring and obtaining food
What gives a tunicate it's name?
the leathery tunic it develops as an adult
What is the cephalothorax?
The anterior part of an arthropod body, consisting of a head and thorax fused together.
What do cleaner shrimp and wrasse do?
They set up cleaner stations where they eat parasites and other organic material off of other fish. symbiotic Mutualism
Why do arthropods molt?
They have a hard exoskeleton made of chitin, so they need to shed it and create a new one when they grow
What is a radula?
an organ found in mollusks, covered with hundreds of small teeth that is used for scraping food into the mouths of mollusks
What is a cephalopod and give in example?
"head-foot" octopus, squid, cuttlefish
Name three traits common to all arthropods.
1.exoskeleton 2. carapace 3. cephalothorax 4 females can store sperm for future eggs 5. open circulatory system
What phylum are tunicates, and lancelets in? Why is this unexpected?
Phylum Chordata. this is unusual because they are invertebrates.
What is a carapace?
An armored shield that covers the anterior portion of an arthropod
What is molting?
The process of shedding an exoskeleton and replacing it with a new one.
What does a sea cucumber use as a method of defense?
It eviscerates some of it's organs, and ejects them to distract an enemy while it gets away?