Pest Fruit Flies of the World – Larvae

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

Anastrepha bistrigata Bezzi

Body length 6–9.6mm; stout, elongate, tapering anteriorly (?). Integument unsclerotized, entirely whitish to yellowish. Caudal ridge absent. Mature larvae unable to jump.

Head. Head of normal shape. Antenna 2-segmented. Stomal organ: primary lobe large, elongate-rounded (?); other peg-sensilla-like structures ?. Stomal region: secondary lobes absent (?); sclerotized stomal guards absent (?). Oral ridges present; number of oral ridges 7–10 (usu. 8–10). 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-A2, or T1-A3, or T1-A4, or T1-A5.

Caudal segment (a8) and anal lobes. Sensilla on caudal segment 10 pairs, with at least 7 pairs visible under dissecting microscope. Dorsal caudal sensilla obvious, sessile or on separate papillae or tubercles. Intermediate caudal sensillum I3 obvious, but not on a papilla or tubercle. Lateral caudal sensillum obvious, but not on a papilla or tubercle. Intermediate caudal sensilla I1a&b obvious, on a single papilla or tubercle, bifid apically. 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 (2 pits, 1 papilla). Anal lobes plainly visible, but not strongly protuberant; simple, or bifid (occ.usu.).

Anterior spiracles. Anterior spiracle elevated, margin concave medially, appearing bilobed. Anterior spiracular tubules 13–20 (usu. 14–17); in a single irregular row.

Posterior spiracles. Posterior spiracular area not distinctly set off from caudal segment. Posterior spiracles: average length of dorsal and ventral rimae 96–130µm; slits 3.3–4.4x longer than wide (3.5–4.2~datasheets). Dorsal spiracular processes with numerous trunks arising from a short or semicircular base (long processes). Number of dorsal spiracular processes 14–26 (usu. 16–20). Number of ventral spiracular processes 11–20 (usu. 11–19; 14–21~datasheets (check)). Number of lateral spiracular processes 6–14 (SPII:6–8; SPIII:10–14). Basal width of spiracular processes 19–55µm (SPI:29–55;SPIV:19–48). Dorsal and ventral spiracular processes: average number of tips 23–35 (Steck data). Dorsal and ventral spiracular processes: ratio of number of tips to number of trunks 0.8–2.7 (Steck data). Area between posterior spiracles smooth (?).

Linear discriminant functions. Anastrepha striata vs. A. bistrigata: C = 23.5log(BAS) – 0.75(ANS) – 0.63(TRK) – 15: C less than 0.

Host plants. Myrtaceae.

Part of plant attacked: fruit.

Biogeographic region. Neotropical.

Specimens examined. Based on description by Steck & Malavasi (1988; Brazil: University of Sao Paulo, ex culture, n=23).

Sources of data and SEM numbers: 131.

Illustrations. • Cephalopharyngeal skeleton, caudal segment (posterior). • Spiracles.


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’.

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