Solitary zooids: up to 95 mm long (Salpa aspera). Test ridges longitudinal and serrated; bearing stronger echinae on the posterior half. MI to MIII fused or contiguous in the mid-dorsal region; MVIII and MIX converging but not contiguous in the mid-dorsal region.
Aggregate zooids: up to 60 mm long, excluding projections (Salpa aspera 1). Both anterior and posterior projections echinate; posterior projection with a cut off or bifid appearance. MI to MIV strongly fused in the mid-dorsal region; MIV and MV converging but not fused laterally.