Phylum coetenterata
Study of coetenterata is called as cindology
Term coetenterata = LEUCKART
characteristics of coetenterata
* These are mostly aquatic or marine habitat animals.
*These species exhibit a tissue level organization .
*Acoelomate (coloum absent) .
*The mouth is enclosed by thin and short tentacle.
*Mouth located on Hypostome present on anterior part of body.
* They are diploblastic animals .
1. Ectoderm
2. Endoderm
*Ectoderm- One layer makes up the cells outside the body .
*Endoderm - the other forms the inner lining of the body.
* The body is radially symmetrical.
* They have cavities in their body.
*The digestion is both intracellular and extracellular.
* Reproduction both asexual (budding), sexual( sex cell) . Eg, Rhizostoma, xenia obelia, velella, Aurelia ,Hydra etc.
Classification of coelenterata
Coelenterates are classified into three different classes.
1 Hydrozoa
2 scyphozoa
3 Anthozoa
HYDROZOA
*These species are mostly marine, but some species is freshwater.
*Body radial symmetrical.
*Found in colonies and few are found solitarily .
* Polyps is dominant form .
*Medusa with vellum ( craspedote) .
* Mesogloea is acellular.
Eg. Hydra, Obelia, Physalia, Bouginvellia,Hydractine etc .
SCYPHOZOA
*All marine .
* All solitarily .
*Radial symmetrical.
*Medusa dominant .
*Medusa without vellum ( acrospedote).
*Mesogloea is cellular thik and fibrous.
Eg. Aurelia( moon jelly ), Cyanae( sun jelly ) etc .
ANTHOZOA
*Thay are found all marine .
*Body symmetrical is biradial .
*Medusa is not present.
Eg . Metridium, Corallium , Heliophara, Tubipora etc.
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