Most of the free-living Nematoda has a vermiform body shape, turning to fine on the extremities, the head and the tail.
However some nematodes present different shapes.
Fusiform: typical for the sub-order Desmoscolecina
"S" format: typical for the family Draconematidae.
Another curiosity about this family is the larger region anteriorly which looks like a head but in fact is the pharyngeal region.
“з” format (epsilon): typical for the family Epsilonematidae
Different body shapes indicate special patterns of locomotion as can be seen in the figure:
Concerning the size, free-living nematodes varies from 82μm (Greffiella minutum) up to some centimeters (some spp. of Enoplida).
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