deuterostomia Flashcards
what are the two phylum of deuterostomia?
echinodermata and chordata
some shared developmental characteristics of deuterostomia?
tripoblastic: three germ layers
radial cleavage with indeterminate development
what animals does the phylum echinodermata encompass?
sea stars, sea urchins, sea lilies, sea cucumbers
echinodermata have a calcareous ____________ suited to fossilization
endoskeleton
are echinodermata motile?
no! they are sessile
what is the symmetry of phylum echinodermata?
adults - penta-radial
larvae - bilateral symmetry
how do echinodermata reproduce?
broadcast spawning - fertilization occurs in open water
what type of system do starfish have?
water vascular
starfish have a circulatory system that does not carry blood, but rather?
water
starfish have a network of hydraulic canal branching into extensions called?
tube feet!
what is the madreporite of a starfish?
allows for water to flow in and out of the vascular system
how does the water vascular system function for starfish?
water comes in through the madreporite, and then pumped into the arms, and then into the tube feet
