Paratrizygia albidens, Oliveira, Sarah Siqueira & Amorim, Dalton De Souza, 2010

Oliveira, Sarah Siqueira & Amorim, Dalton De Souza, 2010, Four new species of Paratrizygia Tonnoir from the Brazilian Atlantic Forest (Diptera, Mycetophilidae, Sciophilinae), Zootaxa 2629, pp. 29-46 : 40-43

Paratrizygia albidens , sp. nov.

( Figs. 6 , 12 , 13 )

Diagnosis. Apical projections of gonocoxite thin, hook-shaped at apex. Gonostyle weakly sclerotized, elongated, not strongly curved, with a single apical spine. Aedeagus with a medial projection at base directed ventrally.

Material examined. Holotype ɗ, BRAZIL, State of São Paulo, Sertãozinho, Estação Ecológica Augusto Ruschi, Malaise trap, 21°08’ S, 47°59’ W, 30.xii.2009 – 19.i.2010, V.C. Silva & D.S. Amorim cols. (BIOTA- FAPESP). Paratypes 1 Ψ, same data as holotype, 1 ɗ, same data as holotype, but 15.xi–01.xii.2009; 1ɗ, State of São Paulo, Matão, 28.vi.2007, Malaise trap, F.B. Noll col. (BIOTA-FAPESP); 1 ɗ, State of Paraná, Ponta Grossa, Parque Estadual de Vila Velha, Res. IAPAR, Malaise trap, 25°14’09” S, 50°00’17” W, 08.xii.1986, PROFAUPAR.

Description. Male. Head. Vertex brown, with scattered setae. Three ocelli, mid ocellus slightly more ventral in position than lateral ones. Occiput brown. Eyes setose. Scape and pedicel yellow, with longer setae apically along apical margin; 14 brownish flagellomeres, almost twice longer than wide, with scattered setae and a short apical neck. Front and clypeus brown, covered with short setae; labella yellow; maxillary palpus yellow, five palpomeres, basal palpomere very small, apical ones increasingly longer, last palpomere more than twice penultimate. Thorax. Scutum and scutellum brown. Pleural sclerites brown. Pleural membrane yellow. Scutum moderately arched, covered with scattered small setae and stronger supra-alar, dorsocentral and acrostical. Scutellum with four scutellar bristles of slightly different sizes and many setulae. Pronotum densely setose, with some stronger setae. Anepisternum with some stronger setae and many setulae; katepisternum more or less squared ventrally. Mesepimeron reaching ventral margin of thorax, devoid of setae. Laterotergite only slightly projected, with 6–9 setae of different sizes, suture separating from mediotergite incomplete dorsally. Mediotergite slightly curved on profile, ventral half with a pair of patches with some longer setae and some setulae. Haltere whitish yellow, with a few setae on pedicel and more densely setose on knob. Coxae whitish yellow, femora, tibiae and tarsi yellow. Mid and hind first tarsomere more than twice the length of second tarsomere; mid and hind tibiae and tarsi with erect darker short bristles along almost entirely length, those on hind tibia more or less aligned dorsally and laterally. Tibial spurs 1:2:2, about twice the length of tibial width at apex, internal spurs shorter. Tarsal claws with a larger apical tooth and a smaller, more basal one. Wing ( Fig. 6 ). Length, 1.6 mm, width 0.6 mm. Membrane homogenously light brown, no maculation; membrane densely covered with microtrichia on all cells, macrotrichia densely distributed, less so in the basal cells. Sc complete, ending in C just before base of Rs, setose, well sclerotized. C ending before wing apex, extending about a third the distance between R5 and M1. First sector of Rs almost transverse, devoid of setae, about as long as r-m. R1 relatively long, reaching C on apical third of wing; R5 reaching C quite before wing margin, well sclerotized; r-m almost longitudinal, well sclerotized, setose. M1+2 unforked; a loose vein between medial and cubital inforked veins (possibly M4); CuA complete, well sclerotized. A1 incomplete, not produce on the apical half. All apical veins with dorsal macrotrichia. Abdomen. Abdomen brown, setose, slender. T8 short and wide, S8 slender, longer than wide, rounded apically. Terminalia brown, conspicuous, quite elongate. Terminalia ( Fig. 12 ). Gonocoxite setose, elongate, fused to each other only at ventral margin, with apical extensions tapering towards apex, apically curved inwards; gonostyle elongated, thin at base, wider mid way to apex, more or less gently curved, acute apically, with a single apical spine, weakly sclerotized; aedeagus slightly sclerotized, pointed at apex, with a medial projection at base directed ventrally; T9 long, setose, with four characteristic regular rows of spines at a apical fold facing ventrally; cerci not medially fused, weakly sclerotized, covered with setulae.

Female. As the male, except. Wing length 1.6 mm, width 0.6 mm. R1 eleven times the r-m length. Antennal flagellomeres not as elongate as the male, near each other. Terminalia ( Fig. 13 ). Terminalia yellow. Spermathecae not visible (but maybe present). S8 separated from S7 by a large membranous area, a pair of apical gonapophyses separated by a apical medial suture; T8 wide, twice length of T9, with setae only laterally; S9 (genital fork) without an anterior medial extension; T9 wide and short, setae emerging from digitiform projections along apical margin; S10 membranous, with microtrichia; T10 not visible, maybe fused to T9; Ce1 slightly more than 2.5 times Ce2 length, covered with microtrichia and few scattered setae; Ce2 ovoid, covered with microtrichia and few setulae.

Etymology. The species name is feminine, derived from the Latin words albus, for white, and dens, for tooth, referring to the single apical whitish tooth of the gonostyle.

Comments. In alcohol specimens, the gonocoxites are sometimes further apart from each other, so the medial incision is wider, differing from the slide mounted specimen drawn, where the apical extensions of the gonocoxite are nearly parallel. This may also apply to the other species.

Figures

FIGURE 12. Paratrizygia albidens, sp. nov. Male terminalia, ventral view. Holotype. Scale 0.1 mm.

FIGURE 13. Paratrizygia albidens, sp. nov. Female terminalia, lateral view. Paratype. Scale 0.1 mm.

FIGURES 3 – 6. Wings of Paratrizygia. 3. P. balbii, sp. nov. Holotype. 4. P. alvesi, sp. nov. Holotype. 5. P. c a m a rg o i, sp. nov. Holotype. 6. P. albidens, sp. nov. Holotype. Scale 0.25 mm.