Phthinia freemani, Oliveira, Sarah Siqueira & Amorim, Dalton De Souza, 2010

Oliveira, Sarah Siqueira & Amorim, Dalton De Souza, 2010, The genus Phthinia Winnertz (Diptera, Mycetophilidae) in the Neotropical region, with the first records from Brazil, Zootaxa 2350, pp. 22-34 : 28-29

Phthinia freemani , sp.n.

( Figs. 3 , 7 )

Diagnosis. Sc reaching C close to the origin of Rs; first sector of Rs clearly oblique; M1+2 about as long as r-m; ventral margin of gonocoxite with a short, incurved, setose projection; gonostyle digitiform, slender towards apex.

Material examined. Holotype. 3, CHILE, Chiloé, Dalcahue, 42°22’45.5”S 73°38’50.1”W, iv.1968 (L. E. Peña col.). Paratypes. 2 3, same data as holotype.

Description. Male. Head. Vertex brownish, setose; three ocelli present, in a triangular arrangement, the lateral large, near eye margin, the middle one small; occiput brown; eyes setose. Scape and pedicel rounded, yellow, with distal setae, pedicel larger than scape; 14 flagellomeres brownish, with scattered setae, with no distal neck, flagellomeres in contact with each other, the first very long, approximately twice the length of the other ones. Front and clypeus yellow, setose; labella yellow, setose; four palpomeres increasing in length to apex, yellow, setose; palpomeres one and two rounded and small, three and four long. Thorax. Thorax predominantly yellowish. Pronotum yellow, setose. Scutum highly arched, setose, yellow with three longitudinal bands, thick and brown; scutellum yellow, setose, with two long central bristles. Pleural membrane yellow. Mediotergite brownish, setose lateraly. Laterotergite brownish, nude. Halter with a yellow pedicel and a brown knob, setose. Legs. Legs yellow, long and slenders; tarsomere one anterior approximately twice the length of the tibiae. Tibial spurs 1:2:2, approximately as long as the tibial width at apex. Wing ( Fig. 3 ). Length, 3.6 mm. Width, 1.2 mm. Membrane hyaline, densely covered with macrotrichia, microtrichia also present. C extending about a third of the distance between R5 and M1, ending at wing apex; Sc complete, reaching C just basal to origin of Rs; sc-r present, basal; R1 long, reaching C at about distal fifth of wing; first sector of Rs oblique, almost half the length of r-m; r-m about as long as M1+2; medial fork complete, M1 sinuous apically, slightly depressed before apex; cubital fork complete, M4 originating just beyond M1+2 fork, about a third of length of first sector of CuA; apex of CuA strongly arched towards base; A1 ending far from wing margin, before origin of M4. Abdomen. Abdomen brownish, setose, long and slender. Terminalia ( Fig. 7 ). Terminalia brownish. Distal margin of syngonocoxite almost reaching base of gonostyles, gonocoxite distal extension curved inward ventrally, not extending beyond apex of gonostyle, inner margin of gonocoxite with a blade slightly projecting inwards; gonostyle digitiform, with some long setae, not bifid or strongly sclerotized; tegmen with a pair of short distal projections; aedeagus not strongly sclerotized; sternite 10 present, bilobed, with setae distally on each lobe; tergite 9 with a pair of lateral lobes connected mesally; cercus lobose. Female. Unknown.

Etymology. Feminine. The species is named in honor to the British entomologist Paul Freeman, who authored the major review on the temperate South American Mycetophilidae s.l.

Comments. This species seems to be close to P. f u rc a t a Freeman and to P. parafurcata , sp.n. It can be separated from both by it tapered gonostylus, and from the latter species by lacking the distal lateral extensions of the tergite 9 and for not having a dorsal projection in the gonocoxite.

Figures

FIGURE 7. Male terminalia of Phthinia freemani, sp. n., dorsal view. Paratype. Abbreviations: Ce, cercus; Gc, gonocoxite; Gs, gonostylus; S 10, sternite 10; T 9, tergite 9; Tg, tegmen.

FIGURES 1 – 4. Wings of Phthinia. 1. P. t h ere s a e, sp. n. Holotype. 2. P. urubici, sp. n. Paratype. 3. P. freemani, sp. n. Paratype. 4. P. parafurcata, sp. n. Paratype. Scale: 0.5 mm.