primitive form of structural support left behind by the bleach
stinging cells all cnidarians have and use for protection and for catching food
stinging devices on the tentacles of cnidarians
What two forms do cniddarian life cycles alternate between?
Polyp and medusa
a sessile (permanently attached) asexual stage (look like hydra)
sexual stage (look like jellyfish)
What are the jellyfishes "gonads"?
They are not true organs, but just clusters of gametes (eggs and sperm)
In what ways can Hydra reproduce?
Asexually (like polyps, by "budding") and sexually (with eggs and sperm, like the medusa form)
dorsal fold of tissue that secretes the shell
water passes into the mantle cavity through the ventral incurrent siphon and out through the dorsal excurrent siphon
also directs the jet of water that is forced out of the mantle cavity when the squid contracts its mantle
Annelids have serially segmented bodies
This means that the body is composed of repeated similar segments or "metameres".
This is called metamerism and is also found in arthropods and chordates.
"second" body cavity that surrounds and is completely separate from the digestive cavity.
Inside this fluid-filled space of the coelom the internal organs can increase their surface are by bending and coiling (human intestine), can fill, empty, and slide past one another, lubricated with coelomic fluid (human lungs).
Foudn in annelids, mollusks, & other "higher" phyla
Not found in porifera and cnidaria
Bristles attached to the outside of the parapodia that help the earthworm move
How might parapodia aid in gas exchange?
Parapodia have a large surface are and keep fresh water with a high concentration constantly moving over the respiratory surface.
Bees, butterflies, roaches
crabs, lobsters, crayfish
spiders, ticks, scorpions
How many pairs of legs do insects have?
How many pairs of legs do crustaceans have?
How many pairs of legs do arachnids have?
Which anthropod has wings?
echinoderms and chordates
anthropods and mollusks
What three parts are the adult body of insects divided into?
Head, thorax, and abdomen
In arachnids and crustaceans the head and thorax are fused into a cephalothorax
Amphibians, reptiles, birds, mammals
What is the sieve plate?
The round structure which leads into the water vascular system on a starfish
What is the dermal papulae?
The clear-white fleshy protrusions of the coelom that serve as sites of gas exchange