Medium- or small-sized Rhynchokarlingiidae (1–3 mm long) with two cuticular hooks in male copulatory apparatus. Hooks of extremely variable form and size, resembling knives, daggers, claws, etc; but they always triangular- or cone-shaped (not sack-shaped), with more or less developed, often bent, sharp distal tips. Hook length in each pair either equal or different. Bulbus muscle wall either non-homogeneously developed, with paired thickenings or knob-shaped structures, or without them, homogeneous. Penis with normally developed papilla.
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