Polychaetes of the Suborder Phyllodociformia of the Polar Basin and the Northwestern Part of the Pacific: Families Phyllodocidae, Alciopidae
, Tomopteridae, Typhloscoleicidae, and Lacydoniidae.
Of the 83 families of known polychaetes (Rouse & Pleijel, 2001), only the Tomopteridae, Alciopidae, Lopadorhynchidae, Iospilidae, Typhloscolecidae, and Pontodoridae are exclusively pelagic (Fauchald, 1977; Stop-Bowitz,1981).
These include the work of Apstein (1891), who studied the Alciopidae deposited in the Natural History Museum in Hamburg and described several new species for Chile.
A total of eight species of planktonic polychaetes were determined; seven of these belong to the families Tomopteridae, Iospilidae, Lopadorhynchidae, Typhloscolecidae and one undetermined species belongs to the family Alciopidae.