The former stay larvae for the rest of their lives and reach sexual maturity at that stage.

1) "The Newt is an amphibian of the Salamandridae family, order Urodela or Caudata, found in North America, Europe, and Asia. Their eggs are laid singly in ponds or slow-moving streams, attached to aquatic plants. This distinguishes them from the free-floating eggs of frogs, that are laid in clumps, or toads, that are laid in strings. The larvae leave the water as a terrestrial form called an eft, returning to the water when mature to live or to breed. The adult form has a lizard-like body and is either aquatic or semi-aquatic." "The oldest form of the name is eft, which is still used for newly metamorphosed juveniles, but according to the Oxford English Dictionary it changed for unknown reasons first to euft and then to ewt. For some time it remained as an ewt, but the "n" from the indefinite article an shifted to form a newt." Source and further information: http://en.wikipedia.org/wiki/Newt 2) "Larval salamanders and newts as well as neotonic salamanders (those that remain aquatic throughout their lives) can be kept in aquatic setups without land. Aquariums ranging from 5 to over a 100 gallons can be used depending on the size and quantity of the individual amphibians being kept. The water should be maintained at a temperature proper for that species. A good filtration system is important as are water changes of 20-50% every one to two weeks at least. Once larval salamanders and newts are nearing the time that they leave the water, an area of land must be provided. Any non-toxic material that floats or acts as a land mass can be used. Gravel, rocks, plastic platforms, etc. can be used. Adult salamanders and newts (efts) that are non-aquatic should be provided with mostly a land area that is kept moist and relatively dark. Sphagnum moss, logs, etc. can be used in a 5-100+ gallon glass aquarium. The cage should be kept moist. Small water dishes are all that are needed except for breeding. Extremes in temperature and high levels of light should be avoided." Source and further information: http://www.fishpondinfo.com/saly.htm