Pest Fruit Flies of the World – Larvae
Trypeta ludens Loew, Anastrepha lathana Stone
Mexican fruit fly. Body length 5.8–11.1mm (7.5–12.0~Steck data); stout, elongate, tapering anteriorly. Integument unsclerotized, entirely whitish to yellowish. Caudal ridge absent. Mature larvae unable to jump.
Head. Head of normal shape; cephalic lobes moderately developed. Antenna 2-segmented. Stomal organ: primary lobe large, elongate-rounded; number of peg sensilla three; peg sensilla unbranched; other peg-sensilla-like structures absent. Stomal region: secondary lobes absent; sclerotized stomal guards absent (?). Oral ridges present; number of oral ridges 11–17 (12–16~Steck data); margins entire (or slightly undulant). Accessory plates present (small, interlocking with outer edges of oral ridges). 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-T3, or T1-A1.
Caudal segment (a8) and anal lobes. Sensilla on caudal segment 10 pairs, with at least 7 pairs visible under dissecting microscope. Intermediate caudal sensillum I2 obvious. Intermediate caudal sensilla I1a&b and I2 on separate papillae or tubercles. 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; bifid (1/2/?; usually distinctly).
Anterior spiracles. Anterior spiracle elevated, margin concave medially, appearing bilobed. Anterior spiracular tubules 12–21 (13–22~Steck data); in a single irregular row.
Posterior spiracles. Posterior spiracular area not distinctly set off from caudal segment. Posterior spiracles: slits 3.1–4.6x longer than wide (~Steck data; about 3.5~WEH). Dorsal spiracular processes with numerous trunks arising from a short or semicircular base (medium processes). Number of dorsal spiracular processes 6–13. Number of ventral spiracular processes 6–13. Number of lateral spiracular processes 4–7. Dorsal and ventral spiracular processes: average number of tips 17–28 (~Steck data). Dorsal and ventral spiracular processes: ratio of number of tips to number of trunks 1.5–3.5 (~Steck data). Area between posterior spiracles smooth.
Host plants. Anacardiaceae, Annonaceae, Caricaceae, Clusiaceae, Ebenaceae, Fabaceae, Lauraceae, Myrtaceae, Passifloraceae, Punicaceae, Rosaceae, Rubiaceae, Rutaceae, Sapotaceae.
Part of plant attacked: fruit, single seed (including achene; see also capitulum) (native host).
Biogeographic region. Nearctic, Neotropical.
Specimens examined. Based on description by Carroll & Wharton (1989 and unpublished data; ex culture (n=30, TAMU); Chiapas (n=?, progeny of single females).
Sources of data and SEM numbers: 141.
Illustrations. • Cephalopharyngeal skeleton (lateral & dorsal). • Spiracles. • Head (anteroventral) SEM. • Stomal organ SEM. • Head (lateral) SEM. • Anterior spiracle SEM. • Caudal segment (posterior) SEM. • Caudal segment (lateral) SEM. • Anal lobes SEM.
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’.