Fleet of Worlds series of novels (a subset of Niven's Known Space future history). The Gw'oth resemble starfish and inhabit the ocean under the ice of their home world, the moon Jm'ho. When linked together – using a vestigial talent that few Gw'oth retain – they can form a powerful biological computer. One such instance is named Ol't'ro. Ol't'ro is composed of 16 Gw'oth individuals who link themselves together into a 'meld' or ensemble mind called a Gw'otesht. Ol't'ro is featured prominently throughout the Fleet of Worlds series. Ol't'ro's ultimate fate is unknown after Fate of Worlds. Whether Ol't'ro died in the explosion of planets or somehow escaped is left unanswered. Ol't'ro had just solved the mystery of Type II hyperspatial travel so it is possible but unknown that the Gw'otesht managed to escape in that fashion. Jotoki The Jotoki (singular Jotok) are a fictional alien race, first described in the novelette "The Survivor" by Donald Kingsbury, in Man-Kzin Wars IV. Jotoki resemble large, spindly starfish. They have a torochord (ring-shaped) instead of a notochord, with five "self-sections" (apparently semi-independent brains) that operate the Jotok's body cooperatively. The Jotoki begin life as small aquatic swimmers, most of which are eaten by predators; in time, five of the survivors will merge to form one collective organism, which grows into an arboreal adolescent form; its tails become arms, and its fins differentiate into fingers. When it grows large enough, the Jotok imprints itself on an adult (if one is available) and enters a stage of rapid learning and brain growth. A Jotok who desires a family can simply go into the wilderness and "harvest" an adolescent of the proper age (a property that Kzin slavers later exploit). Unimprinted adult Jotoki are considered feral, and regarded as little more than animals. Since the five subunits that make up one Jotok individual are not necessarily genetically related, reproduction does not require sex; a Jotok can simply find a pond and deposit its offspring to begin the cycle again. Before their enslavement, Jotoki operated in groups called "clanpods", as part of their former planet-wide tradeweb. Details of this arrangement are not known. Jotok technological specialties included gravity polarizers, linguistics and biotechnology. They had the ability to force-grow clones to adulthood. The Jotoki were also experts at trade. Their interstellar trade empire was quite developed for its time, but after Kzinti were used as mercenaries for