The Trichosomoididae, as most nematodes, have an elongate body, vermiform and covered with a cuticle.

There is often a cuticular ornamentation in form of cephalic vesicles or bosses.

The Trichosomoididae are small, with sometimes a marked sexual dimorphism, the female being larger than the male.

In some cases, the male lives permanently or penetrates deeply in the female uterus.

[2] Nematodes of the family Trichosomoididae are all parasites[2] of various tissues (mucosa, paracloacal glands, cornea, musculature, swimbladder wall) and even bones of fishes and mammals.