Clausocaris is an extinct genus of Thylacocephalan containing the single species Clausocaris lithographica from the Late Jurassic (Tithonian) aged Solnhofen Limestone in Germany.

[1] It was originally named Clausia by Oppenheim in 1888, but was later changed to Clausocaris.

The morphology suggests a lifestyle of a mobile or ambush oceanic predator.

[2] Fossils have shown a carapace covering the bulk of its body, with compound eyes, possible gills, and also "raptorial appendages" controlled by "substantial striated muscles".

[2]