Stipulosina, 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 : 262

Key to the species of Stipulosina

1) Eye height less than 3× genal height ( Fig. 15c ). Hind tibia with some enlarged dorsal setae on distal half; hind femur similar in color to hind tibia and weakly swollen, about twice the diameter of the tibia ( Fig. 15a ). Surstylus with a single long curved lobe with three stout preapical setae ( Fig. 16a )................ Stipulosina curvistylus new species, known only from one male.

- Eye height greater than 4× genal height ( Figs. 6c , 9c , 12c ). Hind tibia with only uniformly small dorsal setae; hind femur darker than hind tibia and conspicuously swollen, at least 3× the diameter of the hind tibia ( Figs. 6a , 9a , 12a ). Surstylus either broad and densely setose ( Figs. 7a , 10a ) or slender and deeply bifid ( Fig. 13a ), never curved with stout preapical setae.......... 2

2) Proximal posterodorsal mid tibial seta small, 0.6× the length of anterodorsal seta at same level ( Fig. 12e ). Cercus reduced to posteroventral corner of epandrium but with conspicuously thick setae ( Figs 13a, c ). Subepandrial plate broad, triangular or T-shaped ( Fig. 13c ). Surstylus deeply cleft, U-shaped ( Fig. 13d ), with two long, narrow, sparsely setose ventral lobes............................................................................. Stipulosina ceroptistylus new species.

- Proximal posterodorsal mid tibial seta large, 0.75× the length of anterodorsal seta at same level ( Figs. 6e , 9e ). Cercus separate, elongate and setose ( Figs. 7c , 10d ). Subepandrial plate somewhat X-shaped ( Figs. 7c , 10d ). Surstylus bilobed but not deeply cleft, but, densely setose at apices ( Figs. 7a, b , 10a, b )........................................................ 3

3) Male cercus longer than surstylus, setae at apex of cercus much longer than surstylar setae ( Fig. 7a ). Lateral margins of female T8 dilated, conspicuously longer than dorsal part of sclerite ( Fig. 9c )............... Stipulosina amphibarba new species.

- Male surstylus longer than cercus, setae on ventral margin of surstylus longer than setae on cercus ( Figs. 10a, e ). Lateral margins of female T8 only slightly dilated, not conspicuously longer than dorsal part of sclerite ( Fig. 11c )...................................................................................... Stipulosina barbistylus new species.

Figures

FIGURES 6a–e. Stipulosina amphibarba sp. n. male habitus. 6a, lateral; 6b, dorsal; 6c, head; 6d, wing against white background; 6e, mid tibia dorsal.

FIGURES 7a–d. Stipulosina amphibarba sp. n. male abdomen. 7a, terminalia left ventrolateral; 7b, terminalia ventral; 7c, epandrium posterior; 7d, phallus and associated structures left dorsolateral.

FIGURES 9a–e. Stipulosina barbistylus sp. n. male habitus. 9a, lateral; 9b, dorsal; 9c, head; 9d, wing displaying WIPs against black background; 9e, mid tibia dorsal.

FIGURES 10a–g. Stipulosina barbistylus sp. n. male abdomen. 10a, terminalia left ventrolateral; 10b, surstyli ventrolateral, with setosity of outer lobe omitted to show inner lobe structure obstructed in 10a; 10c, terminalia ventral; 10d, epandrium posterior; 10e, epandrium lateral; 10f, phallus and associated structures left ventrolateral; 10g, phallus and associated structures left dorsolateral. Note: left cercus is absent in 10a, 10c, 10d and 10e. The cercus was missing (broken off) from the lone specimen at the time of illustration (before the 2019 collection).

FIGURES 11a–d. Stipulosina barbistylus sp. n. female abdomen. 11a, terminalia dorsal; 11b, terminalia ventral; 11c, terminalia lateral; 11d, spermathecae.

FIGURES 12a–e. Stipulosina ceroptistylus sp. n. male habitus. 12a, lateral; 12b, dorsal; 12c, head; 12d, wing against white background; 12e, mid tibia dorsal.

FIGURES 13a–f. Stipulosina ceroptistylus sp. n. male abdomen. 13a, terminalia left ventrolateral; 13b, terminalia ventral; 13c, epandrium posterior; 13d, epandrium lateral; 13e, phallus and associated structures left ventrolateral; 13f, phallus and associated structures left dorsolateral.

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.