Penniverpa unispinosa Webb

Webb, Donald W. & Metz, Mark A., 2008, A revision of the New World genus Penniverpa Irwin and Lyneborg (Diptera: Therevidae: Therevinae), Zootaxa 1720, pp. 1-45 : 40-43

Penniverpa unispinosa Webb spec. nov.

( Figs. 73–77 , 88 )

Etymology. Unus (Latin) = one, whole; spina (Latin) = thorn, backbone. This name is used as an adjective.

Diagnosis. The male of Penniverpa unispinosa is similar to P. bradleyi and P. e p i d e m a in lacking setae medially on the posterior margin of sternite 8 (Fig. 7). It differs from P. b r a d l e y i and P. e p i d e m a in possessing macrosetae along the posterior margin of the gonocoxite ( Fig. 73 ), the PVL of the ventral lobe in the form of a broad ventroapical point ( Fig. 74 ), and the VMP positioned apically on the LGP of the gonostylus. It also differs from P. e p i d e m a in having the LGP of the gonostylus linear ( Fig. 74 ). The female of Penniverpa unispinosa is unknown.

Description of holotype MALE. Variation (n=1).

Body length 6.8 mm.

Head. Length 0.80 mm. Ommatidia of equal size. Frons pubescence silver, dense; setae absent. Antenna (flagellum missing) dark brown, scape pubescence gray, dense; scape length 0.16 mm, length/width 1.6, scape/pedicel length 2.0, setae black, short, sparse; pedicel length 0.08 mm, length/width 0.7. Maxillary palpus dark brown; length 0.38 mm, length/width 6.3; setae dark brown. Genal setae white. Occipital setae white, sparse dorsomedially; macrosetae dark brown, extending as single row from lateral end of postocular macrosetae.

Thorax. Macrosetae 3 np, 2 sa. Mesonotum pubescence white, dense; setae dark brown, erect intermixed with white to whitish yellow, appressed setae. Pleuron pubescence gray; setae white on propleuron, anepisternum, katepisternum, laterotergite, and scutellum. Wing. Membrane pale gray; veins brown; length 5.4 mm, width 1.8 mm, length/width 3.0; pterostigma brown, narrow. Halter brown. Legs. Coxal setae white; hind coxa with anterior papillate knob. Femora dark brown, pubescence gray; ventral setae brown on fore– and midfemora, white dorsally; av 1:0:1, pv 0:0:3. Tibiae brown, apex dark brown. Tarsi dark brown.

Abdomen. Reddish brown, pubescence white, dense on posterior half of tergite 1, over all of tergites 2–8; dorsal setae white, elongate, appressed, denser across posterior margin. Terminalia dark brown. Sternite 8 ( Fig. 73 ), setae dark brown, absent medially on posterior margin. Gonocoxite ventral view ( Fig. 73 ), setae dark brown, macrosetae dark brown posteriorly; ventral lobe ( Fig. 74 ), PVL in form of broad ventroapical point. Gonostylus ( Fig. 74 ), LGP oblong, apical setae dark brown, short, VMP elongate, positioned apically, apical setae short. Aedeagus with dorsal apodeme ( Fig. 75 ), anterior margin truncate; ventral apodeme ventral view ( Fig. 76 ), not reaching anterior margin of dorsal apodeme; distiphallus ( Fig. 75 ) narrow basally, tapered posteriorly with dorsal spinous projections, ventral view ( Fig. 76 ) AAP elongate with spinous projections, lateral view ( Fig. 77 ), tapered posteriorly in broad curved.

FEMALE. Unknown.

IMMATURE STAGES. Unknown.

Habitats and phenology. Penniverpa unispinosa was hand-netted in March.

Distribution. Penniverpa unispinosa is known from Mexico (Quintana Roo) ( Fig. 88 ).

Specimens examined. Type specimen. The holotype male of Penniverpa unispinosa Webb [MEI 088464] is labeled " MEXICO, Quintana Roo, Allen Point, Ascension Bay, 17.IV1960, J. F. G. Clarke" [19.74, -87.47] and is deposited in the USNM.

Figures

FIGURE 88. Penniverpa spp., distribution map. chersonesa (asterisk), epidema (open circle), festina (closed circle), insular (closed square), unispinosa (open square).

FIGURES 73 – 77. Penniverpa unispinosa. 73. Sternite 8, hypandrium, gonocoxite ventral view. 74. Gonostylus and ventral lobe dorsal view. 75. Aedeagus dorsal view. 76. Aedeagus ventral view. 77. Aedeagus lateral view. Scale = 0.1 mm.