WoRMS note details
"Sternaspis spinosa Sluiter, 1882 has been in doubt ever since the original description because it was described and illustrated with long palp-like appendages; however, this type of appendage has not been reported for any other species ..."
Sendall, Kelly; Salazar-Vallejo, Sergio. 2013. Revision of Sternaspis Otto, 1821 (Polychaeta, Sternaspidae). ZooKeys 286(0): 1-74