Description
provided by Zookeys
AMNH NJ-1862 (holotype): Body length 1.0 cm, wing length 8.0 mm. Most of left lateral view and some of dorsal, right lateral, and frontal view of face observable. Specimen apparently female. Head: Eyes bare, large, not dichoptic, no differentiation of facets nor apparent color patterns. Details of frons and face not entirely observable (e.g., presence of frontal callus and subcallus unlikely; development of ocelli not discernable). Antenna with scape and pedicel not observable but apparently short (not projected); flagellomere I apically narrowed to 0.5 × basal width, with 3 faint annuli; remaining 6 flagellomeres stylate, tapered apicad, articles of approximately equal lengths [best seen in frontal view]. Proboscis robust, palps barely discernable (but apparently short, length 0.4 × that of proboscis), labellum well developed; entire proboscis fairly long, length = 0.75 × depth of head. Thorax: Standard proportions for Tabanidae; legs without discernable spurs (although apices of hind tibiae not observable). Metathoracic spiracle also not observable [e.g., presence of postspiracular scale]. Wing: Completely hyaline, no patterning. Base of R2–5 nearly perpendicular to R1, not at a sharp, acute angle. Fork of R4–5 widely divergent and encompassing entire wing tip, base of R4 perpendicular to R5, then strongly and concavely curved to meet C; base of R4 without a small appendix. M1, M2, M3 nearly parallel; M3 and CuA1 convergent (not parallel); CuA1 and A1 meeting just before wing margin. A2 extended nearly to wing margin; alula very large. Abdomen: Details (e.g., segmentation of cerci) not observable.
Specimen. AMNH NJ-1081 (paratype): Thorax + abdomen length 8.2 mm, wing length 8.5 mm (from base of basicosta to wing tip). Wing: Basicosta present as a thick, scale-like lobe at base of vein C. C thickened proximally, circumambient. Short crossvein h present, where costal thickening is narrowed. Sc long, 0.6 × length of wing, straight and parallel to vein C. Veins R and base of R1 also straight, parallel, and close to Sc; apices of Sc and R1 diverging apically. Dark, heavily sclerotized pterostigma covers and surrounds R1, vein C, and extends to tip of R2+3. R2+3 straight, turned slightly upward at apex. Stem of R4 and R5 straight, base of R4 nearly perpendicular to this stem, then curved upward and meeting C anterior to tip of wing; R5 nearly in line with stem of R4+R5. Cell d large, length ca. 2.7 × the width; with veins M1, M2 and M3 each deriving directly from apical wall of cell. M veins slightly divergent, long; M1 slightly longer than cell d, M3 ca. 0.6 × length of cell d. Crossveins r-m and m-cu in line with each other. Veins CuA2 and A1 meet slightly before wing margin, forming long, complete cua cell with very short vein CuA2+A1. Vein A2 well developed, concave to A1, evanescent apically; anal lobe and anal cell well developed. Alula present but partially obscure. Abdomen: Short, broad, tergites short, typical of tabanids.
- license
- cc-by-3.0
- copyright
- David A. Grimaldi, Antonio Arillo, Jeffrey M. Cumming, Martin Hauser
- bibliographic citation
- Grimaldi D, Arillo A, Cumming J, Hauser M (2011) Brachyceran Diptera (Insecta) in Cretaceous ambers, Part IV, Significant New Orthorrhaphous Taxa ZooKeys 148: 293–332
- author
- David A. Grimaldi
- author
- Antonio Arillo
- author
- Jeffrey M. Cumming
- author
- Martin Hauser