Pieza flavitibia, Evenhuis, Neal L., 2002

Evenhuis, Neal L., 2002, Pieza, a new genus of microbombyliids from the New World (Diptera: Mythicomyiidae), Zootaxa 36, pp. 1-28 : 12-13

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https://doi.org/ 10.5281/zenodo.156131

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scientific name

Pieza flavitibia

sp. nov

Pieza flavitibia , sp. nov.

Male. Length: 0.82­1.05 mm. Head. Black. Eyes dichoptic; ocelli forming a narrow triangle; lateral ocellus 1.5 its diameter from inner eye margin; frons slightly longer than wide, depressed medially, yellow from level of median ocellus to antennae, with medial blackish brown spot; antenna black, scape minute; pedicel slightly wider than long; first flagellomere short, ovoid, broadest at or slightly beyond middle, slightly longer than wide; length of second flagellomere equal to width of first flagellomere; face brown, narrowly yellow beneath antennae; proboscis black, projecting beyond oral margin for distance slightly longer than head height; occiput black with sparse black hairs.

Thorax. Mesonotum and scutellum black with small whitish interhumeral triangular mark, lateral margin yellowish black; dorsum of mesonotum and scutellum with minute scattered brassy hairs; pleura predominantly black, propleuron white, anepisternum with upper portion yellow; medial longitudinal yellow stripe present; coxae light brown, femora dark brown to black on basal three­fourths; tibiae and basitarsi yellowish; apical tarsal segments black; halter with stem yellow, knob whitish.

Wing. Hyaline; veins brown; costa ending at one­third distance from vein R 4 + 5 to M 1; vein R 2 + 3 arising at nearly 90 °; cell dm narrowed apically; vein at base of cell m 1 shorter than r­m crossvein.

Abdomen. Dorsum dark brown; tergites V­VII with narrow yellow to yellowish white fasciae on posterior margin of each segment; tergites III­IV with yellow color at extreme lateral margin only; dorsum with scattered yellowish hairs; venter yellow.

Genitalia ( Fig. 8 View FIGURES 7 ­ 8 ). In lateral view with gonocoxite small, rectangular; gonostyli not evident; gonocoxal apodemes narrow at tip of aedeagus, flaring to broad apex, length subequal to aedeagal apodeme; aedeagus with large subtriangular bulb, tapering sharply to small tip; aedeagal apodeme large, axe­shaped, with broad, rectangular lateral vanes viewed ventrally; lateral rami moderately developed, foliate; epandrium narrow, rectangular, pseudo­surstylus small, incurved; cercus anvil­shaped, half size of epandrium, membranous, partially exserted.

Female as in male except as follows: genitalia ( Fig. 15 View FIGURES 14 ­ 16 ) with vaginal furca V­shaped, lateral processes shaped like an inverted “ 2,” medial processes almost meeting medially, apical process not evident; all processes thickly sclerotized; spermathecal reservoir elongate­ellipsoid, slightly angled apically, minute gland hairs subapically in almost complete transverse band, sclerotized apically, sclerotization fading basally; apical spermathecal duct thin, membranous, length about equal to spermathecal reservoir; sperm pump slightly shorter than reservoir and apical duct combined; apical valve very large, flared apically, size subequal to vaginal furca, with transverse striations; basal valve and basal and common ducts not evident.

Types. Holotype male and allotype female from VENEZUELA: Aragua: 2 km N. Ocumare de la Costa, 31.iii– 2.iv. 1981, A.S. Menke & L. Hollenberg in USNM. Paratypes: 4 males, 1 female, topotypic, collected with the types. Three paratypes in USNM, 2 paratypes in BPBM.

Etymology. The specific epithet derives from the Latin “ flavus ” = yellow + tibia, referring to the yellow hind tibia characteristic of this species.

Distribution. Known only from the type locality in northern Venezuela near Caracas.


Smithsonian Institution, National Museum of Natural History


Bishop Museum