Pest Fruit Flies of the World – Larvae
Trypeta incompleta Becker
Body length 6–8mm (range estimated, LEC coded as 6.8–7.2); elongate-cylindrical (?). Integument unsclerotized, entirely whitish to yellowish. Caudal ridge absent. Mature larvae unable to jump.
Head. Head of normal shape; cephalic lobes slightly developed. Antenna 2-segmented. Stomal organ: primary lobe rounded, protuberant; number of peg sensilla one; peg sensilla unbranched (?); other peg-sensilla-like structures absent. Stomal region: secondary lobes absent; sclerotized stomal guards present; number of sclerotized stomal guards 3–4 (?). Oral ridges present; number of oral ridges 3–5 (range estimated, LEC coded 4); margins dentate (long, sharply pointed teeth). Accessory plates absent (?). Elongate, finger-like lobes arising above mandibles absent. Median oral lobe absent or not protruding. Labium broad (?).
Cephalopharyngeal skeleton. Mandibles: subapical teeth absent; base stout, nearly perpendicular to a line from ventral part of base to apex of mandible. Parastomal bars elongate, free from hypopharyngeal sclerite. Dental sclerites apparently absent, not visible in lateral view.
Spinules and creeping welts. Dorsal spinules on segments T1-A6 (?), or with an unusual distribution (?).
Caudal segment (a8) and anal lobes. Sensilla on caudal segment 10 pairs, with at least 7 pairs visible under dissecting microscope.
Anterior spiracles. Anterior spiracle elevated, margin convex to straight. Anterior spiracular tubules 15–18; 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 3.5–4.5x longer than wide (range estimated, LEC coded 4). Dorsal spiracular processes with only 1 or 2 trunks. Number of dorsal spiracular processes 1 (generally), or 2. Number of ventral spiracular processes 1 (generally), or 2. Number of lateral spiracular processes 1 (generally), or 2. Dorsal and ventral spiracular processes: average number of tips 1–2 (?). Dorsal and ventral spiracular processes: ratio of number of tips to number of trunks 0.75–1.5 (range estimated, LEC coded 1). Area between posterior spiracles with a cellular or rugose appearance (?, LEC coded "U").
Host plants. Rhamnaceae (Ziziphus jujuba, Z. spinachristi).
Part of plant attacked: fruit.
Biogeographic region. Palearctic.
Specimens examined. Based on description by Kandybina (1965; 1977).
Sources of data and SEM numbers: 282.
Illustrations. • Cephalopharyngeal skeleton, anterior spiracle. • Posterior spiracle. • Head (anteroventral), habitus (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. http://delta-intkey.com’.