Pest Fruit Flies of the World – Larvae


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

Bactrocera minax (Enderlein)

Polistomimetes minax Enderlein, Mellesis citri Chen

Chinese citrus fly. Body length 13–15mm; slender, elongate, tapering anteriorly (?). Integument unsclerotized, entirely whitish to yellowish. Caudal ridge present (?; need SEM). Mature larvae able to jump (check notes).

Head. Head of normal shape; cephalic lobes moderately developed. Antenna 2-segmented. Stomal organ: primary lobe small, round; number of peg sensilla two (small), or none apparent; peg sensilla unbranched; other peg-sensilla-like structures absent. Stomal region: secondary lobes present, medial ones elongate, like oral ridges (elongate preoral lobes, appearing similar to small oral ridges); margins of secondary lobes all entire; sclerotized stomal guards absent (?). Oral ridges present; number of oral ridges 16–18; margins entire (long, stout, unserrated). Accessory plates present (numerous, small, shell-shaped, interlocking with oral ridges along outer margin); number of accessory plates numerous; margins unserrated (?). Elongate, finger-like lobes arising above mandibles absent. Median oral lobe absent or not protruding. Labium broad.

Cephalopharyngeal skeleton. Mandibles: subapical teeth absent (?); 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 concave medially, appearing bilobed. Anterior spiracular tubules 17–19; 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 2.5–3x longer than wide (about). Dorsal spiracular processes with numerous trunks arising from a short or semicircular base (medium processes). Number of dorsal spiracular processes 9–16. Number of ventral spiracular processes 9–16. Number of lateral spiracular processes 4–9. Area between posterior spiracles smooth.

Host plants. Rutaceae.

Part of plant attacked: fruit.

Biogeographic region. Oriental.

Specimens examined. Based on description by White and Elson-Harris (1992; Bhutan: ex Citrus sp.).

Sources of data and SEM numbers: 258SEM.

Illustrations. • Cephalopharyngeal skeleton, spiracles, habitus.

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.’.