Mycomya bifida Freeman, 1951

Omad, Guillermo, Pessacq, Pablo & Anjos-Santos, Danielle, 2017, A new species of Mycomya Rondani (Diptera, Mycetophilidae, Mycomyinae) from Argentinean Patagonia, Zootaxa 4363 (3), pp. 445-450 : 448-449

Mycomya bifida Freeman

Mycomyia bifida Freeman 1951: 34 , fig. 18, plate IV (male and female, figures of male hypopygium in sternal view, type locality:

Correntoso lake, Argentina, Neuquén Province, about 40°44’11’’S, 71°40’28’’ W). Oliveira & Amorim 2014: 27 (catalogue). Diagnosis: Mycomya bifida can be separated by other species of Mycomya by the presence of a short mid-coxal spur about half as long as coxa, branched; outer branch with a black brush of bristles apically, inner branch slender, with a few hairs apically. Combs present at apices of hind tibiae only.

Male redescription. ( Fig. 8–9 ). Head. Mouthparts yellow, first two segments of labial palps short, last segment longer than remaining ones. Frons and posterior part of the head brown, vertex light brown. Antenna light brown; pedicel slightly conical, scape rounded, first flagellomere 2x longer than pedicel ( Fig. 8 ).

Thorax ( Fig. 8 ). Light brown with the exception of mesepimerom, wich is yellowish on ventral and dorsal margin. Pronotum with three long bristles and a few small setae; proepimerom, proepisternum, anepisternum and mesepimerom bare; katepisternum light brown on the dorsal half, darkening to dark brown on the ventral half, bare; scutum dark brown on its middle, yellowish to light brown on lateral margin, covered with small setae and a few bristles close to its anterior margin. Scutellum light brown on the dorsal half, turning yellowish on the ventral half, with four strong setae. Legs yellow. Coxa two with a process on the base ( Freeman, 1951, fig. 78), nearly triangular, ending in a small dark bump covered with microtrichia, with two strong spines near apex.

Abdomen. Genitalia ( Fig. 9 dorsal view; ventral view by Freeman, 1951, Fig. 18). Aedeagus long, same length as parameres, with truncate apex. Parameres thin, black, strongly sclerotized. Gonocoxite wide at base, 3 times longer than gonostylus, with small setae on its surface; gonostylus smaller than gonocoxite, with globular base, tapering towards apex. Tergite one to five dark brown dorsally, turning light brown on the sides; tergite six and seven dark brown, last tergites yellowish; sternites light brown, tergite 9 yellowish; tergite 10 brownish, covered with small setae with processus nearly triangular, ending in a thin, long appendage with two or three short lateral setae on each side of the apex and two long bristles on the base ( Fig. 9 ). Cercus wide, similar in shape to boxing glove, with wide rounded apex with two dorsal and two ventral lateral lobes on outer margin ( Fig. 9 ).

Material examined. ARGENTINA: Chubut, Baggilt Lake , state protected area (43°16’S, 71°41’W), hand net, 13.II.2015, Omad, leg. 2 ♂. CIEMEP.

Distribution. Nothofagus forest of western Chubut and Río Negro provinces (Baguilt, Correntoso and Nahel Huapi lakes, Argentina), and eastern of X Region (Casa Pangue, Chile) in the Subandean Patagonia province (Subantarctic subregion, Andean region).

Comments: This is the first record of the species in Chubut province.

Figures

FIGURE 8–9. Mycomya bifida male. 8: Head and thorax, lateral view. 9: genitalia, dorsal view. Abbreviations: ce = cercus; tg = tergite.