Usually arises as a consequence of geographical isolation within a species

Usage examples of subspecies.

She wanted Batty to find She Who Leaps High again, and create a new subspecies of bat.

Valmoril, a subspecies of humanity that had spread through the isolated Corithi Cluster, living secluded there for so long that by now they could only interbreed with other races by pretreating sperm and eggs with enzymes.

The bewildered consul found himself being educated in the descending order of family, subfamily, genus, species and subspecies.

Level upon level of freight depots and warehouse and repair facilities were linked by gaudy old thoroughfares that spanned the globe, bridging canyons that reached from the upper strata, swarming with life, to the glowing depths where several forms of subspecies thrived on the refuse that fell continuously from the towering heights.

These meerkats were most definitely a subspecies that had specialized in a fascinating and surprising way.

Valmoril, a subspecies of humanity that had spread through the isolated Corithi Cluster, living secluded there for so long that by now they could only interbreed with other races by pretreating sperm and eggs with enzymes.

That is, cattle were domesticated independently in India and western Eurasia, within the last 10,000 years, starting with wild Indian and western Eurasian cattle subspecies that had diverged hundreds of thousands of years earlier.

Occasionally Spock would say, “I read a denser concentration of hydroplankton,” or Boyce would say, “There’s a subspecies of filter-fish here,” and when we passed near a kraken or a moon they would grow busy for a few minutes scanning that, but as time passed it became clear there was little new to discover.

But Maati was a messenger, not some kind of a subspecies to be ordered to do busy work because the viizaar felt like exercising her authority.

The limestone appeared in all the hues I'd seen in the city, zebra-striping the landscape in distinctly ungeological patterns, governed by the diffusion of different subspecies of lithophilic bacteria.

Toss in Imposters, Dick's account of a human scientist hunted by aliens, one of whom has usurped his place, a film that several A-list scriptwriters tried unsuccessfully to doctor and which since has been yanked from distribution, and you will gather that Dick's immediate cinematic future is to consist of megablasts of brightly hued, hack-writer-generated meadow muffin, augmented by great glorioso dollops of Flatulaphonic sound, aimed at an undiscerning popcorn- feeding subspecies that can be found grazing the multiplexes with its young, living proof that Dick's first major theme still has relevance in contemporary society.

These expeditions are called hunting, and on feast-days the more athletic citizens urge their horses about the stony deserts in search of a more or less fabulous creature said to resemble a hare and blaze away at the very few things that move, usually a dingy, inedible passerine which I take to be a dwarvish subspecies of Sturnus horridus.