Sclerotised hard parts of dactylogyrus chinensis Lim, 1987, D.lineatus Lim, 1987, D.occelatus Lim, 1987, D.hemiramphodonus Lim, 1987, D.scleropagus Lim, 1987, D.spatulatus Lim, 1987, and D.labiobardi Lim, 1987 - Lim, S.L.H. (1987)