Echinodermata Classes Flashcards
What are the classes?
Asteroidea, Echinoidea, Holothuroidea, Ophiuroidea, Crinoidea
What does Asteroidea mean?
Star form
Asteroidea characteristics?
star shaped
What organisms are in Asteroidea?
sea stars, bat stars, sun stars
What does Echinoidea mean?
spiny form
Echinoidea characteristics?
more or less globular or disc shaped with no arms
What organisms are in Echinoidea?
Sea urchins, sand dollars
What does Holothuroidea mean?
cucumber form
Holothuroidea characteristics?
cucumber shaped with no arms
-spine absent
-circumoral tentacles
What organisms are in Holothuroidea?
sea cucumbers
What does Ophiuroidea mean?
snake tail
Ophiuroidea characteristics?
star shaped with arms sharply marked off from central disc
What organisms are in Ophiuroidea?
Brittle Stars & Basket Stars
What does Crinoidea mean?
Lily form
Crinoidea characteristics?
five arms branching at base