Figure 21 in A Heterolepidoderma and Halichaetoderma gen. nov. (Gastrotricha: Chaetonotidae) riddle: integrative taxonomy and phylogeny of six new freshwater species from Central Europe

Figure 21. Halichaetoderma fluviatile sp. nov. A, dorsal overview showing the keel pattern. B, C, head and neck dorsal scales are very narrowly to broadly rectangular. D, H, dorsal scales are roughly hexagonal to obdeltoid with rounded edges in the upper and central trunk region (D), while broadly oblong with a truncated rear end in the posterior trunk region (H). E, mouth and under-mouth region. Grey dots represent basal bodies of cephalic sensory cilia, while grey areas the ventral ciliary bands. F, internal morphology. G, ventral overview. I, upper-furcal ventral central scales are narrowly oblong with a truncated posterior end. J, posterior sensory bristle scale is double-keeled and cordiform. car, clavate anterior region; ceph, cephalion; crp, central rectangular patch; ct, cuticular teeth; das, differentiated anterior section of intestine; epi, epipleurae; hs, hypostomium; hyp, hypopleurae; int, intestine; ph, pharynx; sc, sensory cilia; vcb, ventral ciliary bands. Scale bar = 30 µm.