It's asymmetrical.
180 degrees
bileteral symmerty
bilaterally symmetry
Grantia compressa was created in 1780.
Porifera. http://en.wikipedia.org/wiki/Grantia
There are many features that distinguish grantia as an animal. The main feature is locomotion which is a key feature for animals.
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Grantia belong to the class Calcarea, a class of marine sponges characterized by their calcareous (calcium carbonate) spicules. They are filter feeders that are commonly found in shallow coastal waters.
upright
they curl up
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