Sluiter (1882) formed the species epithet as 'spinosus' in the original description, but an adjectival change of ending to 'spinosa' is mandatorily required for gender agreement. Contemporaries, for example Selenka (1885:4), soon used Sternaspis spinosa.
Selenka, Emil. (1885). Report on the Gephyrea collected by H.M.S. Challenger during the years 1873–76. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the Years 1873–1876. Zoology. 13 (part 36): 1–25, plates I–IV. available online athttps://www.biodiversitylibrary.org/item/16315#page/461/mode/1up