Soomaspis is a genus of small to average size (about 3 cm or 1.2-inch long) marine arthropods in the Liwiidae Family, that lived during the late Ordovician[1] (early Hirnantian).

[2] Fossil remains of Soomaspis were collected from the Soom Shale Lagerstätte in Western Cape, South Africa.

The dorsal exoskeleton consists of a cephalon, a pygidium and two or three thoracic somites with articulating half-rings, all non-calcified, supposedly of medium convexity.

[1] Soomaspis splendida has been collected from the Soom Shale (early Hirnantian), Keurbos Farm, near Clanwilliam, Cape Province, South Africa.

The Soom Shale is sometimes interfingered with the glacial tillite of the Pakhuis Formation, indicating that Soomaspis lived in the open sea, near the edge of an ice sheet.