Echinoderms - additional information Flashcards
How many living echinoderm species are there?
6500
Echinoderms are restricted to what types of environments?
Marine
Describe the symmetry of echinoderms.
Penta-radial symmetry
What does the water-vascular system function in?
Locomotion, feeding, respiration, chemosensation, excretion
Class Echinoidea
Body is ________/____-like with movable ______ the function in ______
- Rigid ________ called the test
- some echinoids have ________ ________ symmetry, superimposed on the dominant _______ symmetry
globular/disk-like spines - protection exoskeleton secondary bilateral radial
Subclass Asteroidea
- includes sea stars
- Some are predators on ________, ________, _______
- Gaseous exchange occurs through the _____ _____ and ______ _______
- The skeleton is made up of ________ ossicles
oysters, clams, barnacles
tube feet, dermal branchiae
calcareous
Asteroidea
- Around the bases of the spines are finger-like, grayish sacs called ______ _______ which serve as _______ and _________ organs.
- Around the spines and on the sea star’s surface are tiny pincer-like _________ that keep the body surface free of ______ and small _________
dermal branchiae
respiratory, excretory
pedicellariae
debris, organisms
Echinoderm plates are composed of what?
Calcium carbonate
Describe the coelom of echinoderms and mouth thing.
Enterocoelous deuterostomes.
the larvae of echinoderms have what symmetry?
Bilateral symmetry
although some sea stars are carnivores, other feed on what?
detritus, mud
the enterocoelom of sea stars is ________.
ciliated
what does class ophiluroidea lack that asteroidea has?
pedicellariae and hepatic ceca
the madreporite of the sea cucumber is located ________.
internally
