FIGURE 2 in Bridging the gap between chewing and sucking in the hemipteroid insects: new insights from Cretaceous amber

FIGURE 2. Key head structures of Mydiognathus eviohlhoffae (a–c) and Neotrogla aurora (d). (a) Head. Dotted gray lines indicate alignment of mouthpart structures against the labrum (Lr) or lacinia (Lc, only for galea: Ga) (Acl: anteclypeus; At: antenna; ATP: anterior tentorial pit; Ca: cardo; E: eye; ES: epistomal suture; FGR: frontogenal suture; Fr: frons; Ga: galea; Ge: gena; Lc: lacinia; LiP: labial palpus; Lr: labrum; Md: mandible; MxP: maxillary palpus; Oc: ocellus; Pcl: postclypeus; Pf: palpifer; Pg: paraglossa; St: stipes). (b) Head, magnified. White arrowheads indicate the internally expanded lacinial base. (c) Tip of the mouth, magnified. (d) Antennal flagellum of Neotrogla aurora (Psocodea: Trogiomorpha: Prionoglarididae), showing the rupturing mechanism observed in extant Psocodea.