[4] The 5th edition of Fishes of the World classifies this taxon in the family Aracanidae which is in the suborder Ostracioidea within the order Tetraodontiformes.

The specific name unistriata', means one stripe", an allusion to the dark strip running from the eye to the tail.

[6] Capropygia has a deep body is short and has a circular profile and a rather hexagonal cross section, with rdges on the back and belly and on the upper and lower flanks.

The mouth has fleshy lips aotha single row of cloely set curved teeth in each jaw.

There is a single dorsal fin, with 12 soft rays, located far back on the body and has a short base.