Pest Fruit Flies of the World – Larvae


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

Plioreocepta poeciloptera (Schrank)

Musca poeciloptera Schrank, Ortalis fulminans Meigen

Asparagus fly. Body length 8.6–10.8mm; elongate, swollen anteriorly. Integument partially sclerotized; sclerotization covering part of caudal segment; sclerotized process(es) on caudal segment present, strongly forked. Caudal ridge absent.

Head. Head of normal shape; cephalic lobes slightly developed, or not developed. Antenna 1-segmented. Stomal organ: primary lobe ?; other peg-sensilla-like structures ?. Stomal region: secondary lobes ?; sclerotized stomal guards absent. Oral ridges present; number of oral ridges 15–19 (usu. 18); margins entire (?). Accessory plates present (in ~6 series); number of accessory plates 100 (ca.+); margins unserrated. Elongate, finger-like lobes arising above mandibles absent (?). Median oral lobe protruding as a pair of flattened, 3- to 4-lobed structures. Labium narrow.

Cephalopharyngeal skeleton. Mandibles: subapical teeth present; tooth smaller than apical tooth, and very stout; with a single ventral tooth (?); base stout, nearly perpendicular to a line from ventral part of base to apex of mandible. Parastomal bars ?. 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 (usu.).

Caudal segment (a8) and anal lobes. Sensilla on caudal segment 10 pairs, with at least 7 pairs visible under dissecting microscope, or 6 or fewer pairs visible (? but check SEM). Dorsal caudal sensilla obvious, sessile or on separate papillae or tubercles (?). Intermediate caudal sensillum I3 absent or visible only with great difficulty (?). Lateral caudal sensillum absent or visible only with great difficulty (?). Intermediate caudal sensilla I1a&b absent or visible only with great difficulty, or obvious, but not on a papilla or tubercle (?). 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 indistinct, retracted into anal slit, or absent; n/a.

Anterior spiracles. Anterior spiracle elevated, margin convex to straight, or not strongly elevated, margin long and convex (?;dorsal lobe almost 2x as long as ventral lobe; tubules lying in a large, broad, eliptical pit). Anterior spiracular tubules 31–47 (~36~, ~White (1988, puparia)); in three or more rows (4 rows if counted front to back; ca. 6 if counted obliquely).

Posterior spiracles. Posterior spiracular area not distinctly set off from caudal segment. Posterior spiracles: slits 1.5–2.5x longer than wide (range estimated, LEC coded 2). Area between posterior spiracles smooth (texture; may have cellular appearance due to subsurface cellular sclerotization).

Host plants. Liliaceae.

Part of plant attacked: stem.

Biogeographic region. Palearctic.

Specimens examined. Based on specimens from Ukraine: Khotski, nr. Pereyaslav-Khm., - Korneyev leg. ex stems Asparagus sp. (n=6, USNM); examined by dissecting microscope by LEC 29.ii.1996.

Sources of data and SEM numbers: 408.

Illustrations. • 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.’.