Carimersa is an extinct genus of artiopodan arthropod known from the Silurian Coalbrookdale Formation of Herefordshire, England.

The second and third head appendages are uniramous and have basipods (basal segments) modified into spined gnathobases (used to process food).

The last two head appendages and the trunk limbs are biramous, and have robust endopods that bear spines, with the exopods being flap-like and reinforced by a rod-like structure.

The presence of associated shelly microfossils of radiolarians and gastropods suggests that it may have been a microdurophagous predator, using the spines on its limb endopods to capture prey and move it towards the mouth, where it would be processed by the gnathobases on the second and third head appendages before being ingested.

[1] Carimersa has been placed as a member of Vicissicaudata within Artiopoda, more closely related to Aglaspidida, Kodymirus and Eozetetes than to Cheloniellida, Sidneyia or Emeraldella.