Protragoneura platycera, 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 : 52

Protragoneura platycera , new species

Figures 73–75 , Plate 7D

DIAGNOSIS: As for genus.

DESCRIPTION: Body length = 2.49 mm (holotype)/ 2.39 mm (paratype); wing length = 1.63 mm (holotype)/ 1.93 mm (paratype). Head ovate, with row of long erect setae behind eye margin. Scape and pedicel subconical, with numerous apical setae, both black. Flagellum compressed laterally, flagellomeres transverse, widths 1.5–2.5Χ length, densely covered with short trichia. Clypeus setose. Three palpomeres seen; antepenultimate one swollen, obovate, length 2Χ width. Penultimate one attached to antepenultimate palpomere preapically; length 4Χ width, knoblike. Apical palpomere long and narrow. Length ratio 1:1.7:2.5. Thorax: Scutum densely covered with short erect trichia, bearing some setae laterally. Antepronotum and proepisternum with long strong setae. Anepisternum with deep cleft. Katepisternum without distinct excavation on anterior margin. Laterotergites, mediotergite bare. Metepisternum with few short trichia ventrally. Wing membrane with macrotrichia in distal and posterior part. Sc extremely short, free. All longitudinal veins except R base with setae. M3 reduced, can be traced by setae only. M 1 base reduced. Base of M 3+4 and CuA fork weakened. Small radial cell length 7Χ width. Halters dark, with few short setae. Legs: Coxae and femora dark, densely setose, tibiae and tarsi yellowish. Hind tibiae with numerous posterior bristles. Tibial spurs 4Χ tibial diameter. Abdomen with 6 visible segments, 7th and 8th very short, retracted. Tergite 9 oval, short, covering the base of gonocoxites. Gonocoxites fused at base, massive, narrowing to apex in distal half. Gonostyli with long ventral lobe bearing a comb of short, knoblike setae; a somewhat shorter, dorsal, bare lobe and internal wide lobe with a row of curved bristles.

MATERIAL: Holotype AMNH Bu­135, male; paratype AMNH Bu­1076, male. Myanmar: Katchin , from amber mines near Myitkyina.

ETYMOLOGY: The species epithet is derived from platy (Greek πλα´ τυs, broad) and cerus (Greek κéραs, horn), in reference to the compressed antennae.

Figures

Figs. 73–75. Protragoneura platycera, n.sp. 73. Holotype AMNH Bu­135. 74. Male genitalia laterodorsally. 75. Male genitalia lateroventrally.