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If you look at an echinoderm such as a sea urchin or a sand dollar, you will see that the shell is covered in a pattern (of ambulacral and interambulacral areas) with 5 fold symmetry. A starfish has 5 arms and if you imagine a starfish folding its arms up and over its back until the tips meet, then you will see it begins to resemble a sea urchin, the two are clearly related and have a common ancient ancestor.
What else can I help you with?
What is a starfish's reproduction?
A starfish can reproduce by mating with another starfish or asexually. Asexual reproduction is usually done after a starfish experiences dismemberment. The dismembered arm can grow into a whole new starfish.
Is a starfish an herbivore?
No, a starfish is not an herbivore. Starfish are carnivorous animals that feed primarily on mollusks, crustaceans, and other small marine creatures. They use their tube feet to pry open the shells of their prey.
The ventral surface of a starfish is called?
the ventral surface of a starfish is called oral You Jerk.
Is a starfish a sessile or freemoving animal?
A starfish is a free-moving animal. It can use its tube feet to move slowly along the ocean floor.
Do starfish have scales?
No, starfish do not have scales. They have a hard, calcareous exoskeleton composed of tiny plates called ossicles. These ossicles provide structure and protection to the starfish's body.
What types of starfish are there in New Zealand?
there are cusion starfish, reef starfish, spiny starfish and fire brick starfish in new zealand.
What types of different starfish are there What is the scientific name for a starfish?
It is called toilet water.
Do starfish die?
Yes they can
Is a starfish an animal plankton?
Sure, starfish larvae are planktonic. Adult starfish are not.
Who were starfish ancestors?
Starfish Ancestors
What are spiny starfish?
they are starfish that is spiny
What is a Caribbean starfish?
a starfish from the carribean?
Which starfish is the biggest?
sunflower starfish
What is a bridal starfish?
it is a starfish which is married
What is the predator of the starfish?
Sharks, fish and manta rays are predators of the starfish. Larger starfish also prey on and attack smaller starfish.
What is the offering for Poseidon in poptropica?
The starfish that is on his face in the museum.
Is there such as a poisonous starfish?
There are many starfish that are poisonous, such as the Crown of Thorns starfish, the sun star starfish, the spiny sun star starfish and the leather star starfish. Starfish have sharp spikes that are covered with a thin, venomous skin, which can cause swelling, nausea and vomiting once it is on your skin.
