Mongolodiscus Egyngolia is a genus of very small sized trilobites, that lived during the Lower Cambrian (Atdabanian to Botomian) in what are today the Russia Federation (Siberian Platform, Dzhagdy Mountains), Mongolia, and South Australia.

Like other Agnostida the body of Egyngolia is diminutive, the headshield (or cephalon) and tailshield (or pygidium) are of approximately same size, with 3 thoracic segments in-between.

For a member of the Yukoniidae family central raised area of the cephalon or (glabella) is relatively wide.

The palpebral lobes are short but prominently raised, and the librigenae tiny.

The border is narrow and usually carries six pairs of small marginal tubercles.