| # Pest fruit flies of the world |

L.E. Carroll, I.M. White, A. Freidberg, A.L. Norrbom, M.J. Dallwitz, and F.C. Thompson

### Dacus petioliformus (May)

Callantra petioliforma May

Body. Body elongate; predominantly black or dark fuscous (fuscous).

Head. Number of frontal bristles one pair (weak), or zero. Number of orbital bristles one pair. Anterior orbital bristle of male normal, unmodified. Posterior orbital bristles reclinate; acuminate. Ocellar bristles absent or minute, like setulae. With both inner and outer vertical bristles. Outer vertical, postvertical and postocellar bristles all acuminate. Postocular bristles acuminate. Genal bristle present. Head higher than long. Male and female head width the same (?). Face shorter than frons; with dark spots in antennal furrows, or with spots on transverse sulcus extended medially, or with a transverse band, or bicolorous, with ventral part black (small elongate black spots connected by a transverse band across ventral margin). Parafacial spot present. Eye elongate, considerably higher than long. Antenna considerably longer than face. Scape, pedicel, and first flagellomere all relatively elongate, first flagellomere much longer than pedicel. First flagellomere longer than face; rounded apically. Arista bare or with hairs distinctly shorter than greatest aristal width. Proboscis short, capitate.

Thorax. Inner scapular bristle present and distinguishable from surrounding vestiture; dark. Outer scapular bristle present and distinguishable from surrounding vestiture; dark. Postpronotal bristle absent. Presutural dorsocentral bristle absent. Presutural supra-alar bristle absent. Postsutural supra-alar bristle present. Acrostichal bristle absent. Postsutural dorsocentral bristle absent. Intra-alar bristle present, well developed, similar to postalar bristle. Intrapostalar bristles absent. Number of scutellar bristles one pair. The single pair of scutellar bristles apical. Anterior notopleural bristle present. Posterior notopleural bristle(s) acuminate. Number of outstanding anepisternal bristles one. Katepisternal bristles absent. Anepisternal bristles dark, brown to black. Long, erect setulae on laterotergite absent. Scutellum densely setulose. Setulae on scutellum short, decumbent; unicolorous, acuminate. Transverse suture with the lateral branches wide apart. Complete sclerotized postcoxal metathoracic bridge present. Scutum fuscous (with longitudinal dark fuscous bands); without a large dark central stripe which broadens basally. Postpronotal lobe entirely pale whitish or yellowish; concolorous with lateral postsutural stripe. Posterior half of notopleuron pale whitish or yellowish. Scutum dorsad of notopleuron of the ground color, not whitish or yellowish. Dark lyre-like pattern on scutum absent. Discrete shiny black spots on scutum absent. Median longitudinal black stripe on scutum present. Number of pale whitish to yellow postsutural stripes one (reduced to a small oval spot within the broader black stripe), or zero. Pale medial postsutural stripe of scutum reduced to a small oval spot. Area bordering scutoscutellar suture medially without dark brown spot, light colored, or without dark brown spot, brown. Discrete pale horizontal stripe along upper anepisternum absent or indistinct. Distinct pale vertical anepisternal stripe extending to notopleuron. Katepisternite with pale yellowish or whitish spot present and distinct. Transverse suture with pale transverse stripe extending medially from notopleuron anterior to suture. Katatergite with pale yellowish or whitish spot present and distinct. Anatergite with pale yellowish or whitish spot present and distinct. Subscutellum uniformly black. Mediotergite uniformly black. Dorsum of scutellum flat or slightly convex, not swollen. Scutellum normal; without a dark and pale pattern (at most a narrow dark basal line); with no isolated dark spots; without black mark; without mark.

Legs. Femora slender. Fore femur with regular bristles; with 3–4 strong black ventral spines; with 1 to 3 posterodorsal and 1 posteroventral rows of bristles only. Mid femur and hind femur without spine-like bristles. Middle leg of male without feathering. Femora all entirely of one color; dark mark on fore femur 100% of length of femur; dark mark on middle femur 100% of length of femur; dark mark on hind femur 100% of length of femur.

Wings. Cell bc microtrichia covering whole cell. Cell c microtrichia covering whole cell. Dense microtrichia at end of vein A1+CuA2 in male present. Dominant wing pattern costal-banded. Wing pattern mostly brownish. Dark longitudinal streaks through basal cells absent. Costal band complete from wing base to beyond R4+5. Apex of costal band not distinctly expanded. Costal band extending below R4+5; all one color. Crossvein r-m covered or mostly covered by broad costal band. Crossvein dm-cu hyaline. Crossveins r-m and dm-cu not both covered by a single crossband. Cell r2+3 apical to r-m entirely infuscated. Anal band present, reaching nearly to wing margin along cell cup extension. Cell r1 and r2+3 without darker spots within the pattern. Intercalary band absent. Subbasal crossband absent. Marginal hyaline area in cell r1 absent or indistinct. Ratio of width of apical band in cell r4+5 to length of r-m 1. Anterior apical band or costal band not extended to vein M. Posterior apical crossband absent. Outstanding costal spine(s) at subcostal break absent. Vein R1 dorsal setation without bare section opposite end of vein Sc. Vein Rs dorsal setation non-setulose. Vein R2+3 generally straight. Anteriorly-directed accessory vein emerging from R2+3 absent. Vein R4+5 dorsal setation dense over at least proximal section; ventral setation present. Distance between crossvein r-m and costa equal to r-m. R-m crossvein on cell dm at or near distal third of cell dm. Cell bm broad, parallel-sided. Vein M distally curved anterad. Cell dm widens apically gradually from base. Posterodistal corner of cell dm approximately a right angle. Cell cup extension or lobe present, vein CuA2 abruptly bent; longer than vein A1+CuA2; with parallel margins.

Abdomen. Abdomen petiolate. Abdominal tergites fused. Abdominal petiole made of 1st tergite only. Abdomen in lateral view arched, dome-like, rather rigid. Abdominal tergite 1 parallel-sided; with a prominent hump laterally. Pecten of dark bristles on tergite 3 of male present. Tergal glands on tergite 5 present. Abdominal tergite 5 normal. 6th tergite of female normally concealed; shorter than 5th. Posterior margin of sternite 5 of male with shallow posterior concavity. Abdominal tergites 3–5 predominantly black. Abdominal tergites with medial dark stripe, usually on T3-T5 (T4-T5), or without medial dark stripe; not brown with medial T-shaped yellow mark; without isolated dark areas on lateral margins of T3-T5; without dark brown transverse bands.

Male terminalia. Posterior lobe of surstylus short or absent.

Female terminalia. Syntergosternite 7 straight; shorter than preabdomen; base without a laterally projecting flap; conical. Ratio of syntergosternite 7 to abdominal tergite 5 0.71. Dorsobasal scales of eversible membrane about as large as other scales (?). Aculeus tip laterally compressed; not fused to main part of aculeus, movable; with minute serration, visible only with compound microscope, or with numerous fine to medium sized serrations. Two sclerotized spermathecae. Spermathecae tight-set coils.

Miscellaneous. Male attractant: none known.

Australasian-Oceanian. Australia (Qld.).

Dacinae. Dacini.

Illustrations. • Habitus male (dorsal), wing. Dacus petioliformus.

We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa. See also Guidelines for using data taken from Web publications.

Cite this publication as: ‘L.E. Carroll, I.M. White, A. Freidberg, A.L. Norrbom, M.J. Dallwitz, and F.C. Thompson. 2002 onwards. Pest fruit flies of the world. Version: 2nd April 2019. delta-intkey.com’.

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