Figure 1.
Mouthpart habitus of the male.
(A) Anterior view. (B) Posterior view. Inset shows the papilla-like microtrichia on the submentum. ant, antenna; atp, anterior tentorial pit; cd, cardo; ce, compound eye; cly, clypeus; g, gena; gl, galea; lbr, labrum; lc, lacinia; lp, labial palp; m, mentum; mp, maxillary palp; pm, prementum; ppf; palpifer; ppg; palpiger; sg, subgena; sm, submentum; st, stipes. Scale bars = 500 μm.
Figure 2.
Histological transverse sections of the mouthparts of males.
(A) Overview of the sections in both anterior and posterior mouthparts. (B–I) Cross sections of the mouthpart regions for b–i in (A), respectively. ap, anterior pharynx; cd, cardo; cly, clypeus; epi, epipharynx; g, gena; gl, galea; hyp, hypopharynx; lbr, labrum; lc, lacinia; lm, longitudinal muscle; lp, labial palp; m, mentum; md, mandible; mp, maxillary palp; pm, prementum; sg, subgena; sgc, salivary gland canal; sm, submentum; spc, salivary pump chamber; st, stipes. Scale bars: (A) = 1.00 mm; (B–I) = 100 μm.
Figure 3.
Light micrographs of mouthpart components.
(A) Labrum in frontal view, male. (B) Left mandible, female. Arrow shows the condyles. (C) Inner lateral view of right maxillae, male. (D) Posterior lateral view of right maxillae, male; (E) Labium in posterior view, male. cd, cardo; cly, clypeus; gl, galea; lbr, labrum; lc, lacinia; lp1,2, labial palpomere I and II; m, mentum; mp, maxillary palp; pm, prementum; ppf, palpifer; ppg, palpiger; sm, submentum; st, stipes. Scale bars = 200 μm.
Figure 4.
Labrum and epipharynx of male.
(A) Anterior view of labium. Inset is the magnification of one of campaniform sensilla (arrowheads) and tiny pores on the surface (arrows). (B) Posterior view of the mouthpart removing maxillae and labium. Inset shows the much-branched microtrichia along lateral edges. (C) Epipharynx. Inset shows the magnification of one palmate sensillum in rectangle. (D) Median sensilla patch of epipharynx. bs, basiconic sensilla; cdy, condylus; cs, chaetic sensilla; epi, epipharynx; hyp, hypopharynx; md, mandible; ps, palmate sensilla. Scale bars: (A) and (B) = 250 μm; (C) = 100 μm; (D) = 25 μm.
Figure 5.
Labrum and epipharynx of female.
(A) Anterior view of labium. Note the campaniform sensilla (arrowheads) on the surface. (B) Posterior view of the mouthpart removing maxillae and labium. (C) Epipharynx with sensilla on the membranous surface. (D) Median and apical lateral sensilla patches of epipharynx. Arrowheads show the short basiconic sensilla. bs, basiconic sensilla; cdy, condylus; cs, chaetic sensilla; epi, epipharynx; hyp, hypopharynx; md, mandible; ps, palmate sensilla. Scale bars: (A) = 150 μm; (B) and (C) = 200 μm; (D) = 50 μm.
Figure 6.
(A) Anterior view of the left mandible, male. (B) Posterior view of the right mandible, female. (C) Outer-lateral view of the galea, furnished with densely furcate microtrichia laterally and thick spines apically, male. (D) Lacinia in inner posterior view, showing the side between ridges II and III, male. (E) The side between ridges I and II equipped with densely furcated microtrichia, male. (F–H) The third to fifth segments of the maxillary palp, respectively, female. Arrowheads show the campaniform sensilla. bs, basiconic sensilla. cdy, condylus; cs, chaetic sensilla; r1–3, ridge I–III. Scale bars: (A), (D), and (E) = 150 μm; (B) = 200 μm; (C) and (F) = 100 μm; (G) and (H) = 50 μm.
Figure 7.
(A) Anterior view of the mouthparts with the labrum and mandibles removed, female. (B) Magnification of the thick spines on the maxilla apex. Inset shows the cuticular shafts with several pores (arrowheads), male. (C) The first two segments of the maxillary palp. Arrowheads show campaniform sensilla, male. (D) The distal segment of the maxillary palp, showing the two groups of short basiconic sensilla and campaniform sensilla (arrowheads), male. bb, Böhm's bristles; bs, basiconic sensilla; gl, galea; lc, lacinia; lp, labial palp; mp, maxillary palp; r1–2, ridge I–II. Scale bars: (A) = 250 μm; (B) and (C) = 50 μm; (D) = 25 μm.
Figure 8.
(A) Anterior view of the labium. Inset shows palm-like microtrichia in the asterisk region. (B) Posterior view of the labium. Note the campaniform sensilla (arrowheads) on the lateral side of the prementum. (C) Magnification of the labial palpi. Arrowheads show campaniform sensilla on the two segments. (D) The distal segment of the labial palp, noting the membranous concave and two types of campaniform sensilla (arrowheads). bb, Böhm's bristles; bs, basiconic sensilla; cs, chaetic sensilla; lp1, 2, labial palp I and II; m, mentum; pm, prementum; sm, submentum. Scale bars: (A) and (B) = 200 μm; (C) = 100 μm; (D) = 25 μm.