Trigonometopus lourdesae, Lima & Silva, 2015

Lima, Ângela Maria Alves de & Silva, Vera Cristina, 2015, Four new Neotropical species of Trigonometopus Macquart, 1835 (Diptera, Lauxaniidae), Papéis Avulsos de Zoologia (São Paulo) 55 (9), pp. 131-142 : 137

Trigonometopus lourdesae sp. nov.

( Fig. 3 )

Diagnosis: Brownish yellow body. Postocellar setae cruciate; 1 genal seta; arista inserted pre-basally; antennal scape longer than pedicel. Dorsocentral setae arranjed 0+3. Wing infuscated, with paler anterior margin. Female sternite 8 reduced; hypoproct and epiproct present; 3 spermathecae; cercus well developed.

Description: Male: Head ( Figs. 3A, 3B, 3C ): Rounded vertex, brown; posterior edge of vertex distinctly concave from dorsal view; ocellar triangle placed slightly anterior of vertex, well raised, brown. Frons rectangular, longer than wide; brown, with an anterior median yellow stripe; flat in profile; proclinate setulae from anterior margin to mid way between anterior and posterior fronto-orbital setae; anterior margin, in dorsal view, straight. Face yellow, with brown, median, narrow, stripe, and a thin brown ocular margin till the lower supravibrissal setae (more evident in female paratype); in profile, almost flat; bare; lower facial margin wider; facial length approximately 3 times its upper width. Eye oval, longer than wide, brown. Parafacial yellow, narrow. Gena brownish. Occiput brownish. Antenna yellowish brown, insert- ed in a facial depression: scape longer than pedicel; first flagellomere triangular to oval, with rounded apex; arista pubescent, inserted submedially. Chaetotaxy: outer vertical seta divergent, ½ length of inner vertical seta, reclined; ocellar setae proclinate, ⅓ length of postocellar setae; postocellar setae cruciate; both anterior fronto-orbital seta and posterior fronto-orbital seta reclinate, anterior seta ¾ length posterior seta; 1 genal seta; supravibrissal setae long, reaching base of face; occipital setae in two rows. Thorax: Scutum flat; brown, with paler longitudinal stripes; pleural region brown, postponotal lobe yellowish and continuing to wing base; scutellum triangular, flat, brown. Chaetotaxy: dorsocentral setae 0+3 (anterior seta close to suture); 1 postpronotal seta; 2 notopleural setae; prescutellar acrostichal seta absent; 2 rows of acrostichal hairs; intra-alar seta absent; presutural supra-alar setae absent; 1 postsutural supra-alar setae; 1 postalar seta; 1 anepisternal seta; 1 katepisternal seta; 1 proepisternal seta; 2 scutellar setae, apical pair paralel. Legs: Yellowish brown. Chaetotaxy: fore coxa with 2 anterior apical setae; fore femur with one posterodorsal, one posteroventral and one posterior rows of setae; fore tibia with 2 apical setae: 1 dorsal and 1 ventral; mid coxa with 1 row of apical setae; mid tibia with 2 apical setae: 1 dorsal and 1 ventral; hind coxa with 1 apical seta; hind femur with 1 strong anterodorsal seta; hind tibia with 2 small apical ventral spine. Wing ( Fig. 3D ): Infuscated, with paler anterior margin; Sc, R 1 and R 2+3 light brown; costa sapromyziform; crossvein r-m located before midpoint of discal medial cell; crossvein dm-cu located in midpoint of cell r 4+5; longitudinal veins parallel; vein A 1 short, ending halfway to wing margin. Halter yellow. Abdomen: Brown. Terminalia: Epandrium ( Fig. 3H ) almost oval. Surstylus fused to epandrium. Hypandrium ( Fig. 3I ) as an almost complete ring around phallus base; well sclerotized; with median projections with lateral expansions, arrow shaped. Phallus ( Fig. 3I ) reduced, pear shaped; phallapodeme hourglass shaped. Cercus wide, rounded. Female ( Figs. 3E, 3F ): As males, except for terminalia not telescoped; sternite 8 reduced. Hypoproct and epiproct present. Cercus long. Terminalia: Spermathecae with configuration 1+2, tubular, common duct very short ( Fig. 3G ).

Etymology: This species is named after Maria de Lourdes Alves de Lima, sister of the first author, who has greatly incentived her to complete her scientific research training.

Type material: Holotype: male; Brazil: Mato Grosso [do Sul]. Nioaque , ii.1937 ( MZUSP) . Paratype: Brazil: Mato Grosso [do Sul]. Nioaque , ii.1937, 1 female ( MZUSP). Corumbá, BEP [Base de Estudos do Pantanal, Universidade Federal do Mato Grosso do Sul] – transição Ciliar / Paratudal, 19°34’20,09”S, 57°00’57,09”W, Malaise 2, 14-29.ix.2012, Lamas , Nihei & eq. col., 1 male ( MZUSP) .

Comments: Abdomens of holotype and the paratype from Nioaque were dissected and stored in vials with glycerin and pinned with the specimens. It was very interesting to find in Corumbá, in the State of Mato Grosso do Sul, additional specimens of this species more than 70 years after the first specimens were collected at a locality to the southeast in the same state.

Figures

FIGURE 3: Trigonometopus lourdesae sp. nov. (A) Head, lateral view. (B) Head, dorsal view. (C) Head, frontal view. (D) Wing. (E) Female abdomen, lateral view. (F) Female abdomen, ventral view. (G) Spermathecae. (H) Male terminalia, lateral view. (I) Male terminalia, ventral view.