FIGURES 168–178 in A comparison of external and internal maxilla and mandible morphology of water bugs (Hemiptera: Heteroptera: Nepomorpha)

FIGURES 168–178. The shapes of the apices of the maxillae, the shape of the mandibular file, and the shape of the rupturing device on the maxillae in the Aphelocheiridae: 168–169. Aphelocheirus aestivalis, 168. The left mandibular file with eight spines (the file is divided into four short (sph) and four longer spines (spl), the shape of the maxillary apices (left and right), right maxilla with short bristles (brvex), dorso-lateral view; 169. The shape of the bundles of the mandibular and maxillary stylets; 170–172. Aphelocheirus variegatus, 170. The right and left mandibular file with eight spines: four short (sph) and four longer spines (spl), ventral view; 171. The apex of the left maxilla is wide, apex of the right maxilla is straight; 172. The rupturing device (brvex) is visible, when maxillae are open, apex of the left maxilla is wide; the right apex is straight; Naucoridae: Cheirochelinae: 173–175. Cheirochela feana, 173. The left maxillary apex is wide, the right is straight, dorsal view; 174. The right mandibular file with two blunt pegs (bp), one short spine (sph), and ten long spines (bristles) (spl), which forming a structure to collar—like; 175. The ventral rupturing device (brvex) with stiff bristles, the apex of the right maxilla is straight, but the left one is wide and curved; the right mandibular file (two blunt peg distinctly visible); 176 –178. Gestroiella limnocoroides, 176. The apex of the left maxilla is slightly curved, the apex of the right maxilla is straight, the rupturing device (brvex) with more a flexible bristles; 177. The right mandibular file with two blunt pegs (bp), one short spine (sph), and eleven long spines (bristles) (spl); 178. The shapes of apices of the maxillae (the right apex is straight, and the left is curved), the dorsal row of bristles (brdex) is visible.