Figure 31 in A Heterolepidoderma and Halichaetoderma gen. nov. (Gastrotricha: Chaetonotidae) riddle: integrative taxonomy and phylogeny of six new freshwater species from Central Europe

Figure 31. Halichaetoderma hexagonale sp. nov. A, detail showing the pharynx reinforcements. Note the well-developed cephalion with a free posterior edge. B, ventrolateral view of the head, showing the mouth and the narrowly oblong scales with a posterior truncated end. The mouth ring is oval, approximately 6.3 μm in the largest diameter, and located ventroterminally at U1–U3. C, trunk dorsal scales are hexagonal with more or less rounded edges. They are keeled, partially overlap, and adhere to the basal cuticle layer along most or all of their perimeter. This dominant scale type covers the main trunk portion from approximately U35 till almost U87. D, dorsal view of the head, showing the epipleurae and the narrowly oblong scales with a posterior truncated end. E, dorsal view of the posterior trunk region, showing hexagonal scales and a big very broadly cordiform scale (arrowhead). ceph, cephalion; epi, epipleurae; m, mouth; phr, pharynx reinforcements. Scale bars = 5 µm (E), 10 µm (A, C, D), 15 µm (B).