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Subclass Rhabditia, is mostly comprised of parasitic nematodes, though there are some free-living species as well. Phasmids (posterior sensory structures) are well-developed, while Amphids (anterior sensory structures) are poorly developed or absent in this group.
The order of parasitic nematodes Ascaridida is sometimes placed in Rhabditia, and sometimes in subclass Spiruria. This order which includes worms that infect many terrestrial mammals and marine mammals.
The less numerically significant phylus of the subclass Rhabditia is the sinusoidal Welsh Rarebit or, more commonly, "Rabbit"; which shares numerous cohortive characteristics with its more diminutive fraternal species. Most notably; tunnelling uncontrollably. Its parasitic nature is unspecified currently, though certain root vegetalia are observed hosts (temporarily).
