FIGURES 234–245 in A comparison of external and internal maxilla and mandible morphology of water bugs (Hemiptera: Heteroptera: Nepomorpha)

FIGURES 234–245. 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 Helotrephidae: Helotrephinae; 234–237. Helotrephes semiglobosus, 234. The left maxilla a clearly protruding; 235. The left mandibular file with one to four blunt pegs (bp), five to eight short spines (sph), nine nodule (no), ten to eleven long spines (spl), 12–18 nodules (no); 236. The apex of the left maxilla is lancet-shape (lobe, los), dorsal view; 237. The right maxilla is narrow and lancet-shape (lobe, los),ventral view; 238–239. Hydrotrephes visayasinensis, 238. The apex of the left maxilla is narrow and lancet-shape (lobe, los), dorsal view; 239. The left mandibular file with four blunt pegs (bp), four short spines (sph), one nodule (no), two long spines (spl), seven nodules (no); 240–244. Hydrotrephes balnearius; 240. The left apex of the maxilla is narrow and lancet-shape (lobe, los), the apex of the right is narrow, dorsal view; 241. Maxillae more protrude than the mandibles; 242. The right apex of the maxilla is lancet-shape (lobe, los) on the ventral side; 243. Short bristles on the inner side of the right maxilla (brvin); 244. The right mandibular file with three blunt pegs (bp), four short spines (sph), one nodule (no), two long spines (spl), seven nodules (no); 245. Tiphotrephes indicus, The right mandibular file with four blunt pegs (bp), three short spines (sph), one nodule (no), two long spines (spl), seven nodules (no).