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Nematode Taxonomist have great difficulties determining an accurate phylogeny that shows a logical pattern of evolution.
Many of the nematode species are remarkably similar morpholorically speaking.
The one part of Nematode Taxonomists can focus on is mouth parts and mouth functions.
Convergent evolution seems to be the best current explanation of why all nematodes are so similar.
"Most Nematodes depend on a hydraulic skeleton for locomotion,
and its poor development in these Nematodes may well be a primative feature" (Nicholas, 1984).
"The origin of the tube-shaped guy through fusion of the lateral blastopore lips, and the
development of the ventral nerve cord along the fusion line unequivocally defined the
nematodes as protostomias"(Nielsen, 1996).
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Basics