question:  Why was each inhabitant of the moon-town only referred to as their specific species rather than a distinct name?
context: EVERYTHING IT HAD WAS IN THE GARDEN BY R. A. LAFFERTY [Transcriber's Note: This etext was produced from Worlds of If Science Fiction, March 1961. Not only would there be life traces on that little moon, but it would be a lively place. As though there were but one city, if that is its form. But this might be so varied or so unfamiliar that often both the machine and the designer of it were puzzled as to how to read the results. It was for this reason that Glaser used that model no more, but built others more amenable. And it was for this reason also that the owners of Little Probe had acquired the original machine so cheaply. On Earth it had read Positive on a number of crack-pots, including Waxey Sax, a jazz tootler who could not even read music. But it had also read Positive on ninety per cent of the acknowledged superior minds of the Earth. In space it had been a sound guide to the unusual intelligences encountered. Yet on Suzuki-Mi it had read Positive on a two-inch-long worm, only one of them out of billions. He then narrowed to a smaller area (apparently one individual, though this could not be certain) and got very definite action. So among the intelligences there was at least one that might be extraordinary, though possibly in a crackpot way. Dawn did not come to the moon-town. The Little Probe hovered stationary in the light and the moon-town came up under the dawn. "Not a building, not two sticks or stones placed together. And those two ... why, they could well be Earth-people. And one could only wish that all people were like them. There was a man and a woman, and they were clothed either in very bright garments or in no garments at all, but only in a very bright light. It was water, but water that excelled, cool and with all its original bubbles like the first water ever made. I don't understand that light that surrounds them.
output:  There was only one of each, therefore, they were called by their species.
options:  They were all distinct by their light, and only needed to be referred to as their species.  The population was much too large to name each creature.  The humans of moon-town felt no need to waste time in naming each living creature as they died off too quickly.  There was only one of each, therefore, they were called by their species.