Question

species with very restricted distribution over relatively small range is called

Answer 1

Species with very restricted distribution over relatively small area is called endemism.

Answer 2

The correct answer is endemic species.  

The endemic species refers to the animals and plants, which prevail only in the single geographical area. The species can be endemic to small or large regions of the Earth, some are endemic to a part of the continent, to a specific continent, and others to a solitary island.  

Generally, a region, which comprises endemic species is isolated in some manner so that the species possess difficulty in dispersing to other regions, or it has unusual environmental features to which endemic species are adapted specifically. The phenomenon is known as endemism.