Pest Fruit Flies of the World – Larvae


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

Dacus axanus (Hering)

Callantra axana Hering, Callantra auricoma May

Body length 9–10.5mm (+?); slender, elongate, tapering anteriorly (?). Integument unsclerotized, entirely whitish to yellowish. Caudal ridge present. Mature larvae able to jump (?).

Head. Head of normal shape; cephalic lobes well developed, or moderately developed. Antenna 2-segmented. Stomal organ: primary lobe small, round; peg sensilla unbranched; other peg-sensilla-like structures absent. Stomal region: secondary lobes present, medial ones elongate, like oral ridges (those closest to mouth opening resembling small oral ridges); margins of secondary lobes more than one lobe with serrate margins; sclerotized stomal guards absent (?). Oral ridges present; number of oral ridges 17–21 (very long); margins scalloped (long, deeply serrated, parallel-sided, bluntly rounded teeth). Accessory plates present (numerous, long); number of accessory plates numerous; margins serrated (deeply serrated; ?). Elongate, finger-like lobes arising above mandibles absent. Median oral lobe absent or not protruding. Labium broad.

Cephalopharyngeal skeleton. Mandibles: subapical teeth present; tooth much smaller than apical tooth, and delicate (well developed); with a single ventral tooth; base elongate, forming a more oblique angle. Parastomal bars elongate, free from hypopharyngeal sclerite. Dental sclerites present, posterior to mandibles.

Spinules and creeping welts. Dorsal spinules on segments T1-T3.

Caudal segment (a8) and anal lobes. Sensilla on caudal segment 10 pairs, with at least 7 pairs visible under dissecting microscope (?). Ventral caudal sensilla absent or visible only with great difficulty, or obvious, but not on a papilla or tubercle (?). Anal lobes plainly visible, but not strongly protuberant; simple.

Anterior spiracles. Anterior spiracle elevated, margin convex to straight. Anterior spiracular tubules 19–21; in a single uniform row, or in a single irregular row (?).

Posterior spiracles. Posterior spiracular area not distinctly set off from caudal segment. Posterior spiracles: slits 2–3x longer than wide (range estimated, LEC coded about 2.5). Dorsal spiracular processes with numerous trunks arising from an elongate base (short processes). Number of dorsal spiracular processes 12–16. Number of ventral spiracular processes 12–16. Number of lateral spiracular processes 5–9. Area between posterior spiracles smooth.

Host plants. Cucurbitaceae.

Part of plant attacked: fruit.

Biogeographic region. Australasian-Oceanian.

Specimens examined. Based on description by White and Elson-Harris (1992; Australia: Queensland).

Sources of data and SEM numbers: 315SEM.

Illustrations. • Cephalopharyngeal skeleton (lateral).

Cite this publication as: ‘L.E. Carroll, A.L. Norrbom, M.J. Dallwitz, and F.C. Thompson. 2004 onwards. Pest fruit flies of the world – larvae. Version: 8th December 2006.’.