Chasmataspis is a genus of chasmataspidid, a group of extinct aquatic chelicerate arthropods.

[3] Just like other chasmataspidids, the body of Chasmataspis compose of a prosoma and a 13-segmented opisthosoma, with the latter subdivided into a 4-segmented preabdomen and a 9-segmented postabdomen.

[4] Dorsal to the carapace were pairs of ridges, lateral eyes and median ocelli.

[4] Chasmataspis characterized by a semicircular carapace (prosomal dorsal shield) with pointed genal spines and preabdomen with fused body segments.

[4] Rows of tubercles and spines run through the axial and lateral regions of opisthosoma.