biology

Topics: Species, Animal, Binomial nomenclature Pages: 3 (1443 words) Published: October 15, 2014
Animal Diversity
The number of animal varieties familiar to us is vast as the animal world is diverse. Each distinct variety or type of animals is recognized by scientist as a species. Animals of most species are free-living forms but of others are parasitic in bodies of other animals or even plants. 

According to their habitats animals are divided into the following types     Aquatic animals :- They live in water . Animals living in sea water are called marine & those live in river,ponds,streams,etc are called as fresh water. Aquatic are of different types like-     Zooplankton :- Passively floating in water 

    Nanoplankton – Extremely small plankton.
    Nekton – the aggregate of actively swimming aquatic organism in a body of water able to move independly of water currents is called nekton     Benthos – those animals found living on the sea bottom     Littoral – Animals living in intertidal zone of sea-coast are called littoral     Neritic – pelagic forms that live in coastal waters where the sea bottom is upto about 200 mt deep are called neritic     Lentic – of the fresh water that inhabits standing water      Lotic – Forms that inhabit running fresh water

    Neuston – a collective term used for organisim which rest on the surface of an aquatic ecosystem.     Anadromous – marine fishes that migrate from sea water to river water      Catadromous – Those fish that migrates from river to sea      Euryhaline – Fishes that migrate between fresh ,estuaries & salt water have a wide salinity tolerance .      Stenohaline – these fishes have a only narrow range of salinity tolerance      Terrestrial animals:- They live on lands and are of different types.     Cursorial – they run fast ,eg- Kangroo,dog , horse,etc     Fossorial – They live in burrowing/underground , e.g- earthworm , rabbit ,etc     Arborial – they live on trees , e.g bats, monkeys, etc     Scansorial – They climb walls , rocks,etc e.g. wall lizards , flying squirrel.     Volant or Aerial or...
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