Nematomorphs can be confused with nematodes, particularly mermithid worms. Unlike nematomorphs, mermithids do not have a terminal cloaca.

How are nematodes and Nematomorpha alike and different?

Like nematodes, the nematomorphs have only longitudinal muscle and lack segmentation. Unlike nematodes, though, nematomorphs have a terminal cloaca and no functional gut. The similarities between the Nematoda and Nematomorpha are more that just superficial.

Where nematomorphs are found?

They are found in cockroaches, beetles, mantids, crickets, tettigoniids, grasshoppers, arachnids and crustaceans. Nematomorphs affecting insects are terrestrial or freshwater, though marine nematomorphs also occur. Those associated with insects are always associated with water.