The Sonnetina
This form is a shortened version of the Sonnet. It contains just 10 lines, and is comprised of two quatrains and a couplet. The couplet can be placed either after the two quatrains, or between them. As it is a shortened Sonnet I think the longer lines of pentameter should prevail. If the variation of the closing quatrain is used, the volta appears after the couplet, which acts as a kind of middle ground between the two quatrains. The rhyme scheme for the quatrains can be envelope or alternating (a,b,b,a, or a,b,a,b,) or they can be unrhymed.