Fig. 2
From: Diuronotus aspetos (Gastrotricha): new morphological data and description of the spermatozoon
Cuticular armature and furca. a, b Dorsal view showing the scales on the head and the trunk. c Detail of the ventral scales (arrows) in the interciliary field in the trunk region. d Dorsal posterior end, with the primary tubes. e Dorsal posterior end, showing the secondary tubes (light microscopy). f Reconstruction of the whole secondary tube: scales shape and arrangement and the free apex (asterisk) are visible (SEM). g, h Close-up of the dorsal posterior end showing the primary and the secondary tube of one furcal branch (g light microscopy; h SEM). Note the very thin scales (arrow) tightly adhering to the primary tube and its free apex (asterisk). i, j TEM images showing the duo-gland adhesive system (arrows) of the furcal tubes. pt Primary tube, st secondary tube. Scale bars a–e, g = 16 μm; f, h = 8 μm; i, j = 3 μm