Prosphaerosyllis battiri is a species belonging to the phylum Annelida, a group known as the segmented worms.

[a] Prosphaerosyllis battiri is a species characterized by having only partially fused palps, an unretracted prostomium on its peristomium or showing only slight retraction, the shape of its dorsal cirri and its arrangement of papillae, being numerous anteriorly while less numerous posteriorly.

The palps are short, fused along their entire length except for a terminal notch, which possesses papillae.

The species dorsum and ventrum are covered by large papillae, forming between 3 and 4 rows, giving it a rough appearance.

Posterior parapodia have 4 compound chaetae each, with blades measuring approximately 4.5 μm in length.