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What is a calcisponge?
A calcisponge is any of a group of marine sponges containing calcareous spicules - spicules which resemble calcium carbonate.
What is calcareous epidermal spicules?
Calcareous epidermal spicules are small, needle-like structures made of calcium carbonate that are found in the epidermis of certain marine invertebrates such as sponges. They provide structural support and protection to the organism.
What is the main difference between the classes Hexactinellida Calcarea and Demospongiae?
In calcarea spicules are calcareous, in hexactinellida spicules are silicious and hexa radiated, in demospongiae spicules are absent but spongin fibres are present. that's why demosponges are used as bathroom sponges
What sponges have a skeleton?
Sponges don't have skeletons! They are invertebrates which means the creature doesn't have a backbone, but in this case, it doesn't have a skeleton! (I think this is right, I apologize if it isn't)
What are the functions of spicules in sponges?
Spicules provide structural support.
Why would spongin and spicules discourage predators from eating sponges?
spongin and spicules are the sponges body support and defence
The skeletons of sponges are composed of?
spicules
What are the subgrops of sponges?
calcarea - have calcite spicules, often have calcite exoskeletons glass sponges - silica spicules, no exoskeleton demosponges - silica spicules, may have exoskeleton, made of aragonite if present
What is a calcareous sponge?
A calcareous sponge is any of a variety of sponge of the class Calcarea, with skeletons composed of spicules of calcium carbonate.
What type of animal has cells an osculum and spicules?
Sponges have collar cells, osculum, and spicules.
What class do Grantia belong to?
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.
What kind of animals have collar cells an osculum an spicules?
Sponges have collar cells, osculum, and spicules.
