Allocotocera Mik, 1886

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 : 24-25

Allocotocera Mik, 1886

Eurycera Dziedzicki, 1885:166 .

Allocotocera Mik, 1886: 102 .

Euryceras Marshall, 1896: 291 .

DIAGNOSIS: Laterotergites and mediotergite setose. Wing membrane with macrotrichia and with or without microtrichia. Sc 2 preapical or medial. Base of M 3+4 and CuA fork before the base of the fork of M 1 and M 2.

TYPE SPECIES: Eurycera flava Dziedzicki, 1885: 167 [= pulchella (Curtis, 1837)] (by monotypy).

COMMENTS: Another fossil species occurs in Lower Cretaceous Spanish amber ( Blagoderov and Arillo, 2002).

Allocotocera burmitica , new species

Figure 27 , Plate 3C

DIAGNOSIS: Wing membrane with macro­ and microtrichia. Segment M3 2.5Χ length of r­m, 0.3Χ that of M fork. Sc ends at level of RS base; Sc 2 in the apical one­fourth of Sc, distal to midpoint of Sc.

DESCRIPTION: Body length = 2.86 mm; wing length = 2.46 mm. Head: Flagellum 14­segmented, thickened to apex. Flagellomeres almost equal in length, length of the first one 2Χ its width, apical one 5Χ its width. Scape and pedicel subconical, with small apical setae, 2Χ wider than flagellomeres. Eyes pubescent. Two palpomeres seen, cylindrical, length ca. 4Χ the width. Thorax: Scutum irregularly covered with short setae and with strong, long lateral setae. Antepronotum with long setae. Scutellum with two pairs of long setae and several more short ones. Laterotergites and mediotergite with setae. Metepisternum with two short setae posteroventrally.

Wing membrane clear, with macro­ and microtrichia. Costa ends at tip of R 5. Sc meets C beyond RS base. Sc 2 at level of base of section M3. Section of RS1 transverse. R 1 rather short, about 0.7Χ wing length. R 5 curved caudally, not reaching wing apex. Crossvein r­m approximately 2.5Χ as long as section RS1 and 2.5Χ length of section M3. Fork of M 1 and M 2 3.3Χ as long as section M3. Base of M 3+4 and CuA fork slightly before base of section M3. Legs: Hind coxae with long posterior setae. Fore tibiae longer than first tarsomere. Cerci 1­segmented, 2Χ as long as 8th tergite, setose.

MATERIAL: Holotype AMNH B­056, female. Myanmar: Katchin , from amber mines near Myitkyina.

ETYMOLOGY: The species epithet is a reference to the country of origin of the amber.

COMMENTS: The species is very close to A. xavieri , but differs in having a shorter Sc vein and a longer M 1 and M 2 fork.

Figures

Fig. 27. Allocotocera burmitica, n.sp., holotype AMNH B­056, reconstruction of wing venation.