Leptognoriste davisi, BLAGODEROV & GRIMALDI, 2004

BLAGODEROV, VLADIMIR & GRIMALDI, DAVID, 2004, Fossil Sciaroidea (Diptera) in Cretaceous Ambers, Exclusive of Cecidomyiidae, Sciaridae, and Keroplatidae, American Museum Novitates 3433 (1), pp. 1-76 : 20

Leptognoriste davisi , new species

Figures 19–22 , Plate 2E

DIAGNOSIS: The base of M 3+4 and CuA fork at level of base of RS. Mouthparts form short proboscis. M 1 reaching wing margin. Ninth tergite small, longer than wider, rectangular.

DESCRIPTION: Body length = 1.94 mm (holotype)/ 1.69 mm (paratype); wing length = 1.26 mm (holotype)/ 1.27 mm (paratype). Head round with protruding ocelli. Ocelli in triangle, lateral separated from medial by ocellus diameter and from eye margin by 2 ocellus diameters. Eyes large, rounded, with light emargination, with large facets. Clypeus narrow, triangular, setose. Palpi 4­segmented, palpomere length ratio 1:2:2:3. Apical palpomere attached preapically. Short proboscis, one­half head height. Wing length equal to abdomen length. Sc produced slightly beyond RS base. R 1 length 1.2Χ r­m. M 2 originates in distal half of wing. Base of M 3+4 and CuA fork at level of RS base. Macrotrichia numerous in basal part of wing. Thorax: Scutum with long lateral, dorsocentral and acrostichal and shorter irregular setae. Anterior parapsidal suture distinct. Antepronotum and proepisternum setose. Anepisternum wider than its height. Proepimeron touches katepisternum slightly below anepisternal suture. Mesepisternum with long anterodorsal process, touching anepisternum. Laterotergites with row of long setae. Mediotergite irregularly setose with short setae. Legs: Coxae with relatively short setae. Hind tibiae with bristles in dorsal row, 1.5Χ longer than femora. Abdomen setose, except first sternite. Abdomen insertion very narrow. Tergite 8 shorter than sternite. Tergite 9 narrow, rectangular with numerous setae at apex. Gonocoxites rather slender. Gonostyli slightly curved.

MATERIAL: Holotype AMNH Bu­126a, male; paratype AMNH Bu­126b, male, in the same piece. Myanmar: Katchin , from amber mines near Myitkyina.

ETYMOLOGY: The species epithet is a patronym for Mr. Jim Davis, who supplied the AMNH with fossiliferous amber from Myanmar.

Figures

Figs. 19–24. Leptognoriste, n.gen. 19. L. davisi, n.sp., holotype AMNH Bu­126a. 20. L. davisi, wing of the holotype. 21. L. davisi, head of the holotype. 22. L. davisi, male genitalia of the holotype. 23. L. microstoma, n.sp., holotype AMNH Bu­429. 24. L. microstoma, male genitalia.