Pest Fruit Flies of the World – Larvae
Trypeta cingulata Loew
Eastern cherry fruit fly, Cherry fruit fly. Body length 5.5–9.5mm (range estimated, LEC coded as small - medium); elongate-cylindrical (?). 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 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 1 (small, blunt). Oral ridges present; number of oral ridges 3–7 (LEC; 4–6~Kandybina); margins entire (?). 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-A7.
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. Anal lobes simple, or grooved.
Anterior spiracles. Anterior spiracle elevated, margin convex to straight. Anterior spiracular tubules 21–31 (~Blanc & Keifer; 12–15~Benjamin 1934 (part, incl. indifferens) ~Foote et al. 1992; note: in slide mounted material it's easy to under-count); in two rows (Blanc & Keifer 1955; LEC).
Posterior spiracles. Posterior spiracular area not distinctly set off from caudal segment. Posterior spiracles: slits 3.7–4.7x longer than wide (range estimated, mean 4.2 ~Blanc & Keifer). Area between posterior spiracles smooth.
Host plants. Rosaceae (Prunus serotina (primary native host) and 6 other spp.).
Part of plant attacked: fruit.
Biogeographic region. Nearctic.
Specimens examined. LEC has examined more than 200 specimens from "Germantown, N.Y., Perry Orchard, reared from cherries, det. A. Stone (NMNH); and "Sutton's Bay Mich. det. C. T. Greene (n=~12, NMNH), all of which lack subapical teeth on the mandible and are heavily sclerotized, as also shown in figures by Frick et al. (1954), Blanc & Keifer (1955), Kandybina (1977), and Peterson (1960). From this I draw the following conclusions about the identity of Phillips' specimens, all of which I have examined as well. Phillips specimens (Acad. Sci. Phila.) labeled "Rhagoletis cingulata" are a mix of R. cingulata & R. fausta. The R. cingulata (all teneral, C.U. lot 400, sub 2, (n=6) and sub 3, (n=1) [other specimens from this lot are listed as from "Ithaca, N.Y."]) are all either teneral, or represented only by posterior spiracles or puparium without cephalopharyngeal skeleton (CPS); those with CPS agree with NMNH specimens in lacking subapical teeth on the mandible; The R. fausta (misidentified as R. cingulata) (Ithaca N.Y, 16 July 1929 (n=7)), had the mandibles and spiracles well sclerotized, with a well developed subapical tooth on the lateral side of the mandible, and 2 large stout stomal guards. These were the source of her figures of the CPS and spiracles of "R. cingulata"; the identity of her figures of the caudal segment is unknown at this time.
Sources of data and SEM numbers: as coded by LEC 7.v.96.
Illustrations. • Anterior spiracle. • Mandible.
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’.