FIGURE 1 in Contribution to the morphological description of the marine leech, Ozobranchus margoi (Apáthy) (Rhynchobdellida: Ozobranchidae) by using combined histology, micro-CT and SEM

FIGURE 1. Ozobranchus margoi (Apáthy, 1890) scanning electron micrographs. A, ventral view showing the anterior (as) and posterior sucker (ps). B, dorsal view showing the gills (g) and the typical external annulation (an). C, morphology of the gills (g). Each pair of gills arising from a single biannulate somite of the urosome composed of (a 1 + a 2)> a 3, with a basal stalk (bs) dividing in secondary branches (sb) whence single filaments (f) are departing. D, ventral lateral view of the anterior sucker showing the atrium (a) extruded through the genital aperture (ga). E, ventral view of the branchiate segment showing the approximate position of the genital aperture (ga). F, occasionally a longitudinal canal was observed running the external surface of the filament (lc).