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Hydra (genus)

 
Hydra (genus)

 
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Hydra (genus)
 
 
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Hydra is a genus
Genus

A genus is a low-level taxonomic rank used in the classification of living and fossil organisms. The taxonomic ranks are domain , kingdom , phylum, class , order , family , genus, and species....
 of simple fresh-water animals possessing radial symmetry
Symmetry (biology)

Symmetry in biology is the balanced distribution of duplicate body parts or shapes. The body plans of most multicellular organisms exhibit some form of symmetry, either radial symmetry or bilateral symmetry or glide symmetry....
. Hydras are predatory animals belonging to the phylum Cnidaria
Cnidaria

Cnidaria Cnidarians were for a long time grouped with Ctenophores in the phylum Coelenterata, but increasing awareness of their differences caused them to be placed in separate phyla....
 and the class Hydrozoa
Hydrozoa

Hydrozoa are a taxonomic Class of very small, predatory animals which can be solitary or colonial and which mostly live in saltwater. A few genera within this class live in freshwater....
. They can be found in most unpolluted freshwater ponds, lakes and streams in the temperate and tropical regions by gently sweeping a collecting net through weedy areas. They are usually a few millimeters long and are best studied with a microscope
Microscope

A microscope is an Laboratory equipment for viewing objects that are too small to be seen by the naked or unaided eye. The science of investigating small objects using such an instrument is called microscopy....
. Biologists are especially interested in hydras due to their regenerative ability
Regeneration (biology)

In biology, an organism is said to regenerate a lost or damaged part if the part regrows so that the original function is restored.Regenerative capacity is inversely related to complexity: in general, the more complex an animal is the less regeneration it is capable of....
 and because they appear to undergo senescence
Senescence

Senescence encompasses all of the biological processes of a living organism's approaching an advanced age . The word senescence is derived from the Latin word senex, meaning "old man" or "old age" or "advanced in age"....
 (aging) very slowly, if at all.








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Encyclopedia


Hydra is a genus
Genus

A genus is a low-level taxonomic rank used in the classification of living and fossil organisms. The taxonomic ranks are domain , kingdom , phylum, class , order , family , genus, and species....
 of simple fresh-water animals possessing radial symmetry
Symmetry (biology)

Symmetry in biology is the balanced distribution of duplicate body parts or shapes. The body plans of most multicellular organisms exhibit some form of symmetry, either radial symmetry or bilateral symmetry or glide symmetry....
. Hydras are predatory animals belonging to the phylum Cnidaria
Cnidaria

Cnidaria Cnidarians were for a long time grouped with Ctenophores in the phylum Coelenterata, but increasing awareness of their differences caused them to be placed in separate phyla....
 and the class Hydrozoa
Hydrozoa

Hydrozoa are a taxonomic Class of very small, predatory animals which can be solitary or colonial and which mostly live in saltwater. A few genera within this class live in freshwater....
. They can be found in most unpolluted freshwater ponds, lakes and streams in the temperate and tropical regions by gently sweeping a collecting net through weedy areas. They are usually a few millimeters long and are best studied with a microscope
Microscope

A microscope is an Laboratory equipment for viewing objects that are too small to be seen by the naked or unaided eye. The science of investigating small objects using such an instrument is called microscopy....
. Biologists are especially interested in hydras due to their regenerative ability
Regeneration (biology)

In biology, an organism is said to regenerate a lost or damaged part if the part regrows so that the original function is restored.Regenerative capacity is inversely related to complexity: in general, the more complex an animal is the less regeneration it is capable of....
 and because they appear to undergo senescence
Senescence

Senescence encompasses all of the biological processes of a living organism's approaching an advanced age . The word senescence is derived from the Latin word senex, meaning "old man" or "old age" or "advanced in age"....
 (aging) very slowly, if at all.

Morphology