Full illustrated descriptions are presented of the copepodid stage ofPseudocharopinus narcinae (Pillai),Isobranchia appendiculata Heegaard andBrachiella trichiuri Gnanamuthu. The structure of the copepodid ofP. narcinae is similar to that ofP. dentatus (Wilson). The copepodids of bothI. appendiculata andB. trichiuri are identical with regard to the structure of the second antenna, first maxilla and second maxilla. This structural similarity of the copepodids ofI. appendiculata andB. trichiuri indicate the phylogenetic position of theBrachiella andClavella groups within the family Lernaeopodidae.
The male ofPseudocharopinus narcinae (Pillai) is described and illustrated for the first time. All the other known males of the genusCharopinus Kroyer,Pseudocharopinus Kabata,Schistobrachia Kabata,Dendrapta Kabata andCharopinopsis Yamaguti are compared with that ofPseudocharopinus narcinae.