Stipulosina curvistylus Yau & Marshall, 2021

Yau, Tiffany & Marshall, Stephen A., 2021, Stipulosina new genus (Diptera: Sphaeroceridae: Limosininae) from bamboo (Chusquea scandens stipules in Ecuador, Zootaxa 5072 (3), pp. 255-277 : 273

Stipulosina curvistylus Yau & Marshall n. sp.

( Figs. 15a–e , 16a–f )

Description, holotype male (left mid leg missing): Body length 2.3 mm. General color pale brown, femora and tibiae similarly pigmented. Eye height 2.5× genal height. Mid tibia with an anterodorsal seta at basal quarter and an anterodorsal, dorsal and posterodorsal setae at distal 3/4 (proximal anterodorsal area obscured on unique type). Wing veins yellowish brown, third costal sector 0.8× second costal sector.

Abdomen: Sternite 5 dominated by a prominent trifid posteromedial area made up of a dark, broadly diamondshaped central piece flanked by very broad processes divided into inner and outer surfaces; inner surface densely microtrichose distally and basally with an inward pointed lobe anteroventrally bumpy and apically with a large, stout seta; length anterior to trifid posteromedial area 0.3× length of S4. Epandrium with two very large lateroventral setae. Cercus convex and rounded, with one long and several shorter setae. Subepandrial sclerite broad and well sclerotized. Surstylus comprising a single strongly curved lobe with three short, very stout preapical anterior setae. Basiphallus broadly cylindrical; distiphallus very short and quadrate, ventrally curved, forked, and pointy, dorsally perpendicularly bent then bilobed; apex with a finely spiculate membranous ventral surface. Postgonite stout, dark, sinuate, more or less parallel sided, bilobed apically.

Etymology: The specific name refers to the strongly curved surstylus.

Type material: Holotype (♂, QCAZ): ECUADOR: Napo: SierrAzul Lodge , 14 km W Cosanga, 2200 m, 0°40’55”S, 77°56’9”W, in bamboo stipules, 10.v.2002, S.A. Marshall debu00195563.

Figures

FIGURES 15a–e. Stipulosina curvistylus sp. n. male habitus. 15a, lateral; 15b, dorsal; 15c, head; 15d, wing against white background; 15e, wing displaying WIPs against black background.

FIGURES 16a–f. Stipulosina curvistylus sp. n. male abdomen. 16a, terminalia left ventrolateral; 16b, terminalia ventral; 16c, epandrium posterior; 16d, epandrium lateral; 16e, phallus and associated structures left ventrolateral; 16f, phallus and associated structures left dorsolateral.