-, meaning 'true' or 'genuine', followed by the name of the genus Spio
Fabricius, 1785, type of the family Spionide Grube, 1850, and probably it intended to highlight the closeness between the two genera: "Body as in
Spio [...]. Bristles as in
Spio" (McIntosh, 1915: 176).
Not stated. The name of the genus is composed by the prefix