Ancala fasciata Fabricus, 1775

Mugasa, Claire M., Villinger, Jandouwe, Gitau, Joseph, Ndungu, Nelly, Marc Ciosi, & Masiga, Daniel, 2018, Morphological re-description and molecular identification of Tabanidae (Diptera) in East Africa, ZooKeys 769, pp. 117-144 : 117

Ancala fasciata Fabricus, 1775 Fig. 3A

Location.

Shores of Lake Victoria, Uganda

Descriprion.

Head. Head as wide as thorax (Suppl. material 2: Figure S1A). Eyes shiny green (in freshly collected specimen), turn black after preservation in ethanol. Eyes separated by narrow brown frons with brown and black short hair. Callus (cs) brown, wide basally and tapering posteriorly to form a spindle-shaped upper callus, reaching midway frons. Scar-like callus at posterior end of frons (Suppl. material 2: Figure S1B). Antennae brown, first antennal segment (scape) is yellowish golden-brown with predominantly white hair and few black hairs that appear as a thorn-like anterior projection as on second segment. Third segment (flagellum) brown, relatively wide, with small white hair and four dark brown annulations. Second segment of the palpus is yellowish white with white recumbent hair, interspersed with few black hairs. Palpus with black tip and black labellum (Suppl. material 2: Figure S1C).

Thorax. Thorax brown with brownish-black patterns and black and golden-brown hair, with light brown median stripe that runs down to posterior end of the mesonotum. Median sublateral stripes (st) light brown; may be obscured and only reach half way of mesonotum. Scutellum yellowish and brown shades (brown with yellow postero-lateral border) with white and black hair. Prominent white hair tuft (hf) below postalar callus at base of wing (Suppl. material 2: Figure S1D). Halteres whitish yellow with a yellow stalk. Wing with typical basicosta and costa covered with short black hair with a longitudinal hairless groove. Wing with brown longitudinal cross band that runs up to discal cell and does not reach hind margin. The discal cell (dc) brown (Suppl. material 2: Figure S1A). Fore tibia differs in the species, “swollen” and black with black hair (Fig. 4A ; Suppl. material 2: Figure S1E). Fore femur is brown with black and white hair, tarsus black with black hair. Hind tibia brown with a darker shade distally and lighter basally. Distally hair predominantly black with few white hair, proximal more white hair. Hind femur brownish yellow or golden yellow with white hair, tarsus dark brown with black hair. Middle leg same as hind leg.

Abdomen. Abdomen yellow with yellow and black hair. Seventh segment pointed (Suppl. material 2: Figure S1A). Ventral surface yellow with yellow hair except on last segment with white and black hair.

Figures

Figure 3. Whole tabanid flies. A Ancala fasciata, discal cell (dc) B Tabanus thoracinus, discal cell (dc), haltare (ht) C Tabanus donaldsoni, distinct R 4 appendix (px) D Tabanus taeniola, median stripe (ms), parafacial hair (pf), antennae (at), labellum (lbl), palpus (lp) E Tabanus taeniola variatus, medial triangles (mt), peri-median bands (pm) F Tabanus gratus, haltares (ht), comma shaped shades (cm) G Tabanus guineensis H Atylotus nigromaculatus, eyes with thin black horizontal line (hl) I Atylotus diurnus, haltares (ht), wing with indistinct appendix (px) J Haematopota duttoni K Haematopota fenestralis, double white streak (ds) L Chrysops distinctipennis, hair tufts (hf), bifurcating band (bf).

Figure 4. Key morphological features of sampled tabanid species. A Ancala fasciata B Tabanus donaldsoni green eyes (in fresh sample) C Tabanus donaldsoni, wing with distinct R 4 appendix (px), indistict hair tuft (hf) D Atylotus nigromaculatus, wing with short, clear appendix on R 4 E Haematopota duttoni, mottled wing with a right angled white thick line (in black circle) between vein A 1 and the wing margin, the R 4 has a long appendix F Haematopota fenestralis, shiny black callus on frons, eyes have bright coloured bands G Chrysops brucei, lateral view of head showing the antenna, black mouth parts and brown legs (partial).