Pest Fruit Flies of the World – Larvae

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

Rhagoletis tomatis Foote

Body length 7–10mm; elongate-cylindrical (?). 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 rounded, protuberant (?); number of peg sensilla one; peg sensilla unbranched; other peg-sensilla-like structures ?. Stomal region: secondary lobes absent (?); sclerotized stomal guards present (?); number of sclerotized stomal guards 2–3. Oral ridges present; number of oral ridges 4–5. Elongate, finger-like lobes arising above mandibles absent (?). Median oral lobe ?. 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 with an unusual distribution (T2-A1, ?A2).

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, not bifid apically (?). Intermediate caudal sensillum I2 absent or visible only with great difficulty. Ventral caudal sensilla obvious, on a papilla or tubercle. Anal lobes plainly visible, but not strongly protuberant, or indistinct, retracted into anal slit, or absent (scarcely visible).

Anterior spiracles. Anterior spiracle elevated, margin convex to straight, or elevated, margin concave medially, appearing bilobed (?). Anterior spiracular tubules 18–22; in a single uniform row, or in a single irregular row, or in two rows.

Posterior spiracles. Posterior spiracular area not distinctly set off from caudal segment. Posterior spiracles: slits 2.5–3.5x longer than wide (range estimated, LEC coded approx. 3). Dorsal spiracular processes with a few trunks radiating from a short or semicircular base. Number of dorsal spiracular processes 6–11 (?). Number of ventral spiracular processes 6–11 (?). Number of lateral spiracular processes 6–11 (?). Area between posterior spiracles smooth.

Host plants. Solanaceae.

Part of plant attacked: fruit.

Biogeographic region. Neotropical.

Specimens examined. Based on descriptions by Frias 1986, Frias & Martinez 1991, Frias et al. 1993.

Illustrations. • Cephalopharyngeal skeleton, 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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