Mydiognathus, Yoshizawa, Kazunori & Lienhard, Charles, 2016

Yoshizawa, Kazunori & Lienhard, Charles, 2016, Bridging the gap between chewing and sucking in the hemipteroid insects: new insights from Cretaceous amber, Zootaxa 4079 (2), pp. 229-245 : 231

Mydiognathus n. gen.

( Figs 1 , 2 a–c, 3a–c)

Type species. Mydiognathus eviohlhoffae Yoshizawa & Lienhard n. sp.

Etymology. Named after elongated mandibles (mydion: small forceps in Greek; gnathos: jaw in Greek).

Diagnosis. This new genus is a representative of Insecta, Neoptera, Paraneoptera, and a member of the family Archipsyllidae Handlirsch, 1906 (= sister clade to Condylognatha). It can be distinguished clearly from the other genera of this family ( Archipsylla Handlirsch, 1906 , Archipsyllodes Vishniakova, 1976 , Archipsyllopsis Vishniakova, 1976 and Psocopsylla Özdikmen, 2009 [= Eopsylla Vishniakova, 1976 , not Eopsylla Argyropulo, 1946 ; see Özdikmen, 2009]) by the following wing venation characters ( Figs 1 a,b, 3a) ( Vishniakova 1976; Huang et al. 2008): Sc in forewing with only two sections (near wing base and at the base of pterostigma) in Mydiognathus whereas an additional section proximally of the pterostigma between wing margin and R 1 in the other genera; basal Cua cross vein (or Cua itself in the sense of Nel et al. 2012) in forewing forked from R+M in Mydiognathus whereas from M in the other genera; areola postica (ap) in forewing strongly constricted proximally in Mydiognathus whereas broadest at the base in the other genera; ap absent in hindwing of Mydiognathus whereas present in the other genera as far as known. Apart from these differences, wing venational and other morphological characters are in good agreement with the features previously described for the family, justifying the placement of Mydiognathus in the Archipsyllidae . For detailed morphological information see the description of the type species.

Figures

FIGURE 1. Photographs of Mydiognathus eviohlhoffae. (a) Habitus, right view. (b) Habitus, left view. (c) Head. (d) Connection between first (top) and second antennal flagellomeres. (e) Right hind tarsus, ventral view.

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.