Feeding
what type of vascular system do echinoderms posses?
A coelomic water vascular system
How many arms do sea stars have?
5 arms
What does "derm" mean?
Skin
It was said that echinoderms evolved from bilateral to radial symmetry organisms. What bilateral organisms does this evolved from?
Larva (such as sea cucumbers)
What are the uses of water vascular system?
Nutrient circulation, gas exchange, locomotion
what different colors can a sea star be?
blue, orange, red, purple, pink, white
What does "Echino" mean?
Spiny
What type of feeders are Sea Urchins?
Grazers
When did Echinoderms evolve?
Around 540 Million years ago
Why are echinoderms grouped together?
They are deuterostomes - grow radially
What is unique about a sea star's arms?
They can be regrown
About how many species of Echinoderms exist?
7,000
How do filter feeders feed?
Absorb nutrients by taking in water
What did echinoderms evolve from?
evolved from bilaterally symmetric animals
What is the difference when we say bilateral symmetry to radial symmetry?
Bilateral symmetry is where the parts are two identical reflected halves. While radial symmetry is that the body parts are arranged around a central axis.
what is the length of a sea stars life span?
up to 35 years in the wild
How many different classes are Echinoderms separated into?
21 different classes
How do Sea Stars feed?
how do echinoderms reproduce?
external fertilization - eggs and sperm are freely discharged into water
how does a echinoderms vascular system work?
Water circulates through and facilitates gaseous exchange, nutrition, predation, and locomotion
how many species of sea stars exist?
2,000 species
What organism is considered different from other echinoderms? Why?
Sea cucumber since it doesn't have spine as other echinoderms. Instead, it has soft leathery skin.