Note
A new species of Protoraphis is described. Protoraphis atlantica sp. nov. differs from the type, P. hustedtiana, in having only a straight apical axis. The ultrastructure of this new species is described and compared with that of Pseudohimantidium pacificum Hustedt & Krasske. As in P. pacificum this new species was found epizoic by means of mucilaginous stalks on marine planktonic copepods. Also, as in P. pacificum, its occurrence was found to be linked to the mating behavior of the copepod hosts.