Harris: The copepod genus Porcellidium 
99 
Figure 21. Porce/loidessciitatns (Claus, 1889) comb. nov. Female: (A) adult*; (B) genital double-somite; (C, D) genital opening, superficial 
and deep focus; (E) caudal rami; (F) cephalosome border; Fi focus in plane of hyaline membrane; F 2 focus above membrane showing 
cuticular ridges; F 3 dorsal focus showing dorsal pits (d. pits, hy.m. hyaline membrane; hy.so. hyaline sense organ; o.mg.d. opening of 
marginal gland duct); (G) appearance of border showing false striations; (H) diagrammatic section through cephalosome border {mg. 
marginal gland); (I) dorsal cuticular ridges on cephalosome. * Drawing of specimen from Ireland. Scale bar: A = 0.45 mm. B = 0.23 mm. 
C, D = 0.1 mm. E = 0.14 mm. F = 0.07 mm. 
