There are many features that distinguish grantia as an animal. The main feature is locomotion which is a key feature for animals.
Spicules are tiny structures of hard crystal that give the sponge it's shape. There are many different types of spicules, some examples are; acanthostyles, stongyles, and anatriaenes.
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Hexactinellida, Calcarea, Demospongiae, andSclerospongiaeTechnically, however, the Sclerospongiae are not considered sponges. They are very similar, but they are not the same. Like bats and birds who have both evolved the ability to fly but are not the same types of animals, Slerospongiae have evolved and became very similar to sponges, but they are not sponges.
The major function of spicule is to provide structural support to the organisms. Spicules also play other roles and one of the roles is to provide deterrence from predators that might attack.
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.
Yes, they are called spicules, not pores or spiracles as many people think.
Spicules are tiny structures of hard crystal that give the sponge it's shape. There are many different types of spicules, some examples are; acanthostyles, stongyles, and anatriaenes.
Spicules provide structural support.
It's asymmetrical.
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.
Cnidarians do not have spicules. Spicules are commonly found in sponges and it is a simply a skeleton which has very tiny splinters that look like needles.
Spicules, like our skeleton, give the sponge structure. Without spicules, Sponge Bob would be Sponge Blob.
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