Phthinia parafurcata, 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 : 30-31

Phthinia parafurcata , sp.n.

( Figs. 4 , 8 )

Diagnosis. Sc reaching C close to the origin of Rs; first sector of Rs clearly oblique; r-m shorter than M1+2; tergite 9 with long distal lateral projections; apical margin of gonocoxite ventrally with a short, setose projection dorsally with a blade-like, bare projection, both of them projected inward; gonostyle digitiform, with two spine-like setae.

Material examined. Holotype. 3, CHILE, Chiloé, Dalcahue, 42°22’45.5”S 73°38’50.1”W, iv.1968 (L. E. Peña col.). Paratypes. 12 3, same data as holotype; 1 3, idem, except i.1962.

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 yellow. Pronotum setose. Scutum highly arched, setose; scutellum yellow, setose, with two long central bristles. Pleural membrane yellow. Mediotergite setose lateraly. Laterotergite 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. Wings ( Fig. 4 ). Length, 3.0 mm. Width, 1.1 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, about half the length of r-m; r-m shorter than M1+2; medial fork complete, M1 sinuous apically, slightly depressed before apex; cubital fork complete, M4 originating opposite to fork of M1+2, 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, running quite apart from first sector of CuA. Abdomen. Abdomen brownish, setose, long and slender. Terminalia ( Fig. 8 ). Terminalia yellow. Distal margin of syngonocoxite short; gonocoxite with a mesal constriction, a ventral distal projection curved inwards, not extending distally to the apex of the gonostyle, besides a dorsal, blade-like projection also curved inwards; gonostyle digitiform, with two slender spine-like setae; tegmen rectangular, translucent distally; aedeagus not strongly sclerotized; tergite 9 with a pair of long distal projections laterally, mesally connected; cercus bilobed. Female. Unknown.

Etymology. Feminine. This species was named considering its similarity to Phthinia furcata Freeman, 1951 .

Comments. This species seems to be close to P. f u rc a t a and P. freemani , sp. n., as can be seen by the ventral digitiform distal projection of the gonocoxite. It differs from P. freemani , sp. n. in bearing an additional dorsal, blade-like projection of the gonocoxite and by the long distal lateral projections of the tergite 9, which seem to be present in P. f u rc a t a, but are much shorter. The wing of this species has r-m shorter than in P. freemani sp.n., and has A1 more distant from CuA along its course than most other species.

Figures

FIGURE 8. Male terminalia of Phthinia parafurcata, sp. n., dorsal view. Paratype. Abbreviations: Ce, cercus; dGcdp, dorsal gonocoxite distal projection; Gc, gonocoxite; Gs, gonostylus; T 9, tergite 9; Tg, tegmen; vGcdp, ventral gonocoxite distal projection.

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.