ABSTRACT
The maturation division follows the pattern of the first, i.e., the dyads separate into monads. As with most cuticular ornamentations spines are commonly seen among Secementea, sometimes among Chromadoria, and very rarely in Enoplia. Phylogenies have been proposed on the basis of amphid aperture morphology. Two differing processes of molting are reported for nematodes. In nematodes it is true that a part of the skeleton support system is provided by the liquid-filled pseudocoelom as well as the enteron but such a hydrostatic skeleton alone does not explain the diversity of movement exhibited by nematodes. The proctodeum in males is complicated by the secondary sexual organs and will be discussed with the reproductive system. Other illustrations of sexual dimorphism among nematodes include atrophy of the male feeding apparatus, notable differentiation of cuticular ornamentation or sense organs, and the degeneration of the female into a reproductive sac or the prolapse and growth of the reproductive system independent of the female body.
