Eoptychopterina postica, Liu, Luxi, Shih, Chungkun & Ren, Dong, 2012

Liu, Luxi, Shih, Chungkun & Ren, Dong, 2012, Two new species of Ptychopteridae and Trichoceridae from the Middle Jurassic of northeastern China (Insecta: Diptera: Nematocera), Zootaxa 3501, pp. 55-62 : 56-59

Eoptychopterina postica sp. nov.

( Figs. 1 , 2 )

Diagnosis: Crossvein m-m between M2 and M3+4; The apical part of R3 curving anteriorly; length of R4 and R5 4.5 times as long as dR4+5.

Description: Body: A well-preserved male adult of ventral view, body stout. Head round and significantly narrower than thorax. The left antenna preserved, short, with 11 segments. The right antenna is not preserved, instead a partial leg is preserved extending anteriorly from the left side of the head. Eyes large, ommatidia clearly visible. Thorax subovoid. Abdomen length 5.9 mm, width 2.8 mm with eight visible segments. Male genitalia with harpagones preserved. Head and body fuscous.

Wing: Membrane densely pubescent, especially anteriorly and apically, both wings with distinctly darker area along Costa, M-stem and R3 and transparent spot area at discal cell and its surroundings ( Fig. 1 A). Wings longer than body. The right wing (length 14.7 mm, width 5.8 mm) longer and narrower than the left wing (length 13.7 mm, width 6.5 mm; see Discussion), about 2.5 and 2.1 times as long as wide respectively. Sc long, nearly threefifths of the wing length, and terminating at C proximal to furcation of R4+5. Stem R thick and strong; Rs strongly bent in its two-thirds toward medial veins; R1 long and with a slight bend at R2, dR1 nearly five times as long as R2; R3 longer than R2+3, and shorter than R4, The apical part of R3 curving anteriorly. R4+5 bent at r-m, r-m longer than bR4+5, dR4+5 two times as long as bR4+5; R4+5 ramified symmetrically, R4 as long as R5, R4 and R5 4.5 times as long as dR4+5. Stem vein M weak, M with three branches; dM1+2 slightly longer than bM1+2; M1 smoothly curved at base, and obviously longer than M2; Crossvein m-m connecting M2 and M3+4. CuA distinctly bent at m-cu, and straight beyond it. A1 strongly curved to wing margin ( Fig. 1 A, B, and C).

Material: Holotype, male, CNU-DIP-NN2011001, A well-preserved body with wings ( Fig. 1 ); Paratype, CNU-DIP-NN2011002 p/c ( Fig. 2 ).

Etymology: The species name refers to crossvein m-m slightly distal to M1+2 forking.

Remarks: This new species resembles Eoptychopterina camura Lukashevich, Coram et Jarzembowski, 2001 , and Eoptychopterina elenae Ren et Krzemiński, 2002 but can be easily distinguished from the former in having larger body; longer Sc (three-fifths as long as the wing length); dR4+5 twice as long as bR4+5 and position of m-m between M2 and M3+4 and from the latter in the apical part of R3 curving anteriorly; length of R4 and R5 shorter (length of R4 and R5 4.5 times as long as dR4+5) and the position of m-m. It differs from Eoptychopterina antica Hao, Ren et Shih, 2009 mainly in wing densely pubescent; length of R4 and R5 4.5 times as long as dR4+5; crossvein m-m connecting M2 and M3+4 and the apical part of R3 curving anteriorly.

Figures

FIGURE 1. Eoptychopterina postica sp. nov., holotype, CNU-DIP-NN 2011001. A. Photograph, habitus; B-C. Line drawing; B. Habitus; C. Left wing. Scale bars = 2 mm.

FIGURE 2. Eoptychopterina postica sp. nov., paratype, CNU-DIP-NN 2011002 p / c, photographs. A. Habitus of part; B. Habitus of counterpart. Scale bars = 2 mm.