Mesorhaga villanuevi, Bickel, Daniel J., 2007

Bickel, Daniel J., 2007, The Mesoamerican Mesorhaga (Diptera: Dolichopodidae), with a taxonomic conspectus of the New World fauna, Zootaxa 1411, pp. 47-67 : 66

Mesorhaga villanuevi n. sp. ( Fig. 2 d)

Type material. Holotype, ɗ, Costa Rica: GUANACASTE, P.N. Guanacaste, Est. Pitilla, 9 km S of Santa Cecilia, 700 m, L N 330200 380200, v.1995, L.P. Rios ( INBIO); paratypes, 2 ɗ, same, but vi.1994 and viii.1994 ( INBIO).

Additional material. Costa Rica: ɗ, PUNTARENAS, P.N. Manuel Antonio, Quepos, 80 m, v.1991, R. Zuñiga, ( INBIO); LIMON, ɗ, Sur de Iriquois, 300 m, 23.v.1987, P. Hanson ( INBIO). ALUJUELA, ɗ, San Mateo, Higuito, P. Schild ( USNM).

Description. Male: body length: 3.4 – 3.6 mm; wing: 3.3 x 1.3 mm.

Head: 2–3 strong postvertical setae present, in line with the postoculars; proclinate vertical present on lateral frons; vertex, frons, face, and clypeus metallic blue-green; palp and proboscis dark brown; antenna black; 1st flagellomere subrectangular; arista dorsal, about as long as head height; postcranium with abundant pale white setae ventrally.

Thorax: metallic green with bronze reflections; setae black; pleura with some grey pruinosity; ac present as irregular row of 5–7 setae; lateral scutellar setae about one quarter length of medians.

Legs: all coxae and trochanters black; femora black with yellow knees; tibiae and basitarsi I and II yellow; distal tarsomeres I and II and all tarsus III dark brown; CI and CII with black anterior hairs, CIII with black lateral seta; femora with long whitish ventral setae. I: 4.0; 4.0; 2.7/ 1.0/ 0.5/ 0.4/ 0.4; basitarsus I unusually long, longer than four distal tarsomeres combined. II: 4.6; 5.2; 3.3/ 1.2/ 1.0/ 0.4/ 0.4; TII with offset ad-pd setal pair at 1/5, ad at 2/3, and 2 short ventral setae. III: 5.5; 6.2; 2.5/ 2.1/ 1.5/ 0.7/ 0.6; TIII with some short dorsal setae.

Wing: hyaline; M with strong bend almost at 1/2 between m-cu crossvein and wing apex; CuAx ratio: 0.9; lower calypter pale yellow, with black rim and fan of black setae; halter with yellowish stalk and pale yellow club.

Abdomen: metallic blue-green with bronze reflections, covered with short dark setae dorsally and pale setae ventrally; dark bronze-brown bands on tergal overlap of segments 2–5; tergum 1 with posterolateral long, black setae; terga 6–8 black; hypopygium ( Fig. 2 d) dark brown; phallus and hypandrium elongate; epandrial lobes elongate with subapical seta, strong curved seta at midlength; surstylus with setae as figured; cercus curved and distally expanded, clavate, group of distal setae, and outer subapical notch.

Female: unknown.

Remarks. Mesorhaga villanuevi is known from lower elevations (coast to 700 m), on both the Pacific and Caribbean slopes of Costa Rica.

Mesorhaga villanuevi is named in honor of Dr. Julio Rodríguez Villanueva for his exceptional career in teaching, research, and academic administration, which has contributed remarkably to Spanish scientific progress, and for his support of INBio’s mission in both Spain and Costa Rica.

Figures

FIGURE 2. Mesorhaga adunca Van Duzee a. hypopygium, left lateral. M. falciunguis n. sp.: b. hypopygium, left lateral; c. male distal tarsus I, posterior. M. villanuevi n. sp.: d. hypopygium, left lateral.