Fig. 5

SEM micrographs of the ventral surface topography of adult Phyllodistomum macrocotyle. a Forebody of an unrelaxed worm, note the genital pore and randomly distributed papillae along the ventro-lateral surface. b Oral sucker showing two surrounding rings of tegument bearing surface papillae in a definite pattern. c Posterior extremity of the worm, note the pore of Laurer’s canal and the posterior notch. d Entire body of a relaxed worm. e Ventral sucker showing two surrounding rings of tegument bearing papillae in a definite pattern. f Button-like surface papillae, note the surrounding small, irregular surface elevations. g Region of the ventral sucker margin showing papillae within sucker cavity. Abbreviations: abp, apical papillae on border of sucker rim; cp, papillae within sucker cavity; fb, forebody; ft, frontal tubercle; ftp, papillae adjacent to frontal tubercle; gp, genital pore; hb, hindbody; ie, irregular elvations; ir, inner ring (rim) of oral sucker; la, pore of Laurer’s canal; lbp, lateral papillae on border of sucker rim; mrp, papillae on inner margin of sucker rim; or, outer ring of the oral and ventral suckers; os, oral sucker; p, papillae; pbp, posterior papillae on border of sucker rim; plp, postero-lateral papillae on outer ring of ventral sucker; pn, posterior notch; por, papillae on outer ring; rp, papillae on outer border of rim ventral sucker; sc, sucker cavity; tf, transverse tegumental folds; vs, ventral sucker