Invertebrates , Many species are found in remoter environments smaller species receive less attention than large organism and cataloging these species is a huge task.Most of the world's species remain undiscovered by science.
Biologist classified that 1.7 million plants and animals as 2010 , less than one quarter of total species estimated in the world by the help of new  techniques in molecular biology. They figure out that still over five million species are yet not be found.
The new species like amphibians and reptiles are most undiscovered animals having limited ranges that may inaccessible. Creatures which are smaller and inhabit limited area are more likely to have been overlooked.
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