what pattern of coelom is found in animal kingdom ??
Answers
Answer:
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Explanation:
Acoelomate: Coelom is absent. The blastocoel is completely occupied by mesoderm. ...
Pseudocoelomate: True coelom is not present. The blastocoel is partly filled by mesodermal cells. [Here, psuedo means false-feet]
Eucoelomate: Animals that have a true coelom.
Answer:
. Acoelomate:
Coelom is absent. The blastocoel is completely occupied by mesoderm. E.g. Porifera, Coelenterata and Flatworms (Platyhelminthes). There is only spongocoel or coelenteron present.
2. Pseudocoelomate:
True coelom is not present. The blastocoel is partly filled by mesodermal cells. The body cavity is lined by mesoderm only towards the body wall and mesoderm is not present towards the gut. E.g. Roundworms (Aschelminthes)
3. Eucoelomate:
Animals that have a true coelom. The coelom is lined by mesoderm on both the sides, towards the body wall and towards the gut. The blastocoel present in the gastrula gets completely replaced by a true coelom. The body organs are suspended in the coelom by mesenteries. E.g. from the phylum Annelida to Chordata.
Eucoelomates are further divided into Protostomes and Deuterostomes on the basis of different embryonic development. The process of coelom formation in protostomes and deuterostomes is different. The coelom is categorised into two types on the basis of formation, namely, Schizocoelom and Enterocoelom.
Schizocoelom- Protostomes Eneterocoelom- Deuterostomes
Schizocoelom: It is present in the protostomes. The body cavity or coelom originates from the splitting of the mesoderm. One part attaches to ectoderm and the other surrounds the endoderm. The space between them develops into the coelom. The blastopore forms the mouth. Examples of schizocoelous animals are Annelida, Arthropoda and Mollusca. In Arthropoda and Mollusca the coelom is filled by blood and is known as Haemocoel.
Enterocoelom: It is present in the deuterostomes. The coelom is formed from the fusion of the internal outgrowths of the archenteron, that pinches off and fuses together to form coelom lined by mesoderm. Examples of enterocoelous animals are Echinodermates and Chordates.
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