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 juglandis Cresson

Body length 7–9mm (range estimated, LEC coded as 8); 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 (LEC); number of sclerotized stomal guards large; ?. Oral ridges present; number of oral ridges 6–8 (range estimated, LEC coded 7). 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 (~Phillips'specimens); 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.

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 a single tubercle (?). Ventral caudal sensilla obvious, on a papilla or tubercle (?).

Anterior spiracles. Anterior spiracle elevated, margin convex to straight. Anterior spiracular tubules 10–12 (range estimated, 11 ~ Phillips 1946); 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 about 4). Dorsal spiracular processes with numerous trunks arising from an elongate base (long processes). Number of dorsal spiracular processes 15–17. Number of ventral spiracular processes 15–17. Number of lateral spiracular processes 7–13. Area between posterior spiracles smooth.

Host plants. Juglandaceae (Juglans (2 spp.)).

Part of plant attacked: fruit.

Biogeographic region. Nearctic.

Specimens examined. Based on descriptions by Phillips (1946) and Steyskal (1973, q.v.).

Sources of data and SEM numbers: 365.

Illustrations. • Cephalopharyngeal skeleton, spiracles, caudal segment.


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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