The species
Malacoceros jirkovi Sikorski, 1992 is transferred to
Spio Fabricius, 1785 in the light of new data (listed below). The description of this species is given for the first time in English. About 30 years of the study of polychaetous material from the economic zone of Norway has eventually shown there to be nine species belonging to
Spio inhabiting this area:
S. filicornis (Müller, 1776) [including
S. malmgreni Sikorski, 2001 as a junior synonym],
S. mecznikovianus Claparede, 1868,
S. decoratus Bobretzky, 1871,
S. arctica Söderström, 1920,
S. armata Thulin, 1957,
S. goniocephala Thulin, 1957,
S. jirkovi (Sikorski, 1992), newly described
S. symphyta Meißner, Bick et Bastrop, 2011 and
S. arndti Meißner, Bick et Bastrop, 2011. The species
S. theeli Söderström, 1920 and
S. tzetlini Sikorski, 2001 which might be obtained in the adjacent areas (the Barents and White Seas) are also mentioned to fulfill the list of Arctic fauna.
