Hydra History

Hydra History


* Leuwenhoek discovered it. Linneus named it. Trembley gave its detail.

* Hydra name is given on the basis of power of regeneration (story is based on 9 headed aquatic serpent Hydra)


* Solitary, during budding appear as colonial. Free living.

* Well feed up hydra is dull while starved hydra is more active.

* Present in fresh water & stagnent and cold water. Prefer winter season.

* Generally attached to some base as Hydrilla plant, back of Tortoise.

* If hydra is in bottom, tentales are towards surface due to more O2.

* If hydra is on surface tentacles are towards bottom to get more food.

* If hydra is in middle of pond, it is obliquly placed. Anterior end is toward bottom.

* If we touch any moving hydra it becomes round.


* It is combination of hydra and zoochlorella.

* Hydra gets O2  from algae. Algae gets CO2 and shelter from hydra.

* Algae is shifted from one generation to another generation by bud (favourable condition) or ovum (in unfavourable condition).

Note :- Algae less hydra can be achieved by putting it at low temp or dark or deficiency of Co or in .5% glycerol solution.

According to evolution commensalism, mutalism, symbiosis, parasitism are arranged in ascending order.                           


* Karona                                      = Cilliate,

* Trichordina                              =  Cilliate,

* Hydramoeba hydrexena       =  Sarcodina,

* Microstomum                         =  Platehelminthes.


* Protohydra,

* Microhydra.


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