Trigonometopus mariae, 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 : 138-140

Trigonometopus mariae sp. nov.

( Fig. 4 )

Diagnosis: Yellowish brown species, darker at the dorsal side. Anterior margin of frons almost straight, in dorsal view. Postocellar setae cruciate. Antennal scape as long as pedicel. Dorsocentral setae arranged 1+3; presutural supra-alar seta present. Wing hyaline, infuscated at costal margin, spotted at both end of crossvein dm-cu, two spots along R 4+5 near its apex. Female sternite 8 reduced to a small plate; epiproct present; 3 spermathecae; cercus papilate.

Description: Male: Head ( Figs. 4A, 4B, 4C ): Rounded vertex, brownish yellow; ocellar triangle placed slightly anterior of vertex, slightly raised, brown. Frons rectangular, narrow, at least three times longer than wide; brown; flat in profile; anterior margin strongly covered with proclinate setulae to half way to vertex, and sparsely covered with proclinate setulae until base of posterior fronto-orbital seta; anterior margin, in dorsal view, almost straight. Face yellowish brown, bare; in profile, straight; lower facial margin narrow. Lunule exposed. Eye oval, longer than high, brownish. Parafacial brownish yellow, narrow. Gena brownish yellow, with short setulae. Occiput brown. Antenna brownish yellow, inserted in a facial depression: scape as long as pedicel; first flagellomere oval; arista pubescent, inserted dorsomedially. Chaetotaxy: outer vertical seta divergent, ⅔ length of inner vertical seta, reclined; ocellar seta proclinate; postocellar setae cruciate, ocellar setae ⅔ lengh postocellar setae; anterior and posterior fronto-orbital setae reclinate, anterior seta ⅔ length posterior seta; no genal seta; supravibrissal setae very long, reaching base of face; occipi- tal setae in two rows. Thorax: Scutum flat; brownish yellow, and darker at lateral margins; pleural region brownish yellow; scutellum triangular, rounded apex, flat, brown with yellow central stripe. Chaetotaxy: dorsocentral setae 1+3 (anterior seta close to suture); 1 postpronotal seta; 2 notopleural setae; 2 prescutellar acrostichal setae; 4 rows of acrostichal hairs; intra-alar seta absent; 1 presutural and 1 postsutural supra-alar setae; 1 postalar seta; 1 anepisternal seta; 1 proepisternal seta; 2 katepisternal setae; 2 scutellar setae. Legs: yellow, fore apical tarsomeres darker. Chaetotaxy: fore coxa with 3 apical setae; fore femur with one posterodorsal, one posteroventral and one dorsal rows of setae; fore tibia with 2 apical setae: 1 anterodorsal and 1 ventral; mid coxa with 2 basal setae and 1 apical setae; mid femur with 1 anterior row of setae, 1 apical posterodorsal seta, 1 apical posterior seta; mid tibia with 2 apical setae: 1 anterodorsal and 1 anteroventral; hind coxa with 2 apical setae: 1 anterior and 1 lateral; hind femur thickened, with 1 strong anterodorsal seta; hind tibia with 1 apical anterodorsal spine, 1 ventral spine. Wing ( Fig. 4D ): Hyaline, infuscated at costal margin, spotted at both end of crossvein dm-cu, two spots along R 4+5 near its apex; costa sapromyziform; crossvein r-m located in the midpoint of discal medial cell; crossvein dm-cu located before midpoint of cell r 4+5; longitudinal veins parallel; vein A 1 short, not reaching wing margin. Halter brownish yellow. Abdomen: Brown, with yellow stripes at the anterior margin of the tergites that become paler in each segment toward abdominal apex, which is yellow. Terminalia ( Figs. 4H, 4I ): Epandrium trapezoid, with rounded margins; surstylus rounded, fused to epandrium; hypandrium as an almost complete ring, strongly sclerotized, with paired median sharp projections; phallapodeme Y-shaped, strongly sclerotized; phallus not seen; cercus big, papilate. Female: As males, except for sternite 8 reduced to a small plate. Terminalia not telescopic ( Figs. 4E, 4F, 4G ): Hypoproct and epiproct present; genital chamber as a long tube, posterior apex forming a large bag; dorsal wall with the opening of the spermathecal ducts. Spermathecae with configuration 1+2; ducts of paired spermathecae short until commom duct ( Fig. 4G ). Cercus small, papilate.

Distribution: Brazil.

Etymology: This species is named after Maria Alves de Lima, mother of the first author, for her continuous support to AMAL.

Type material: Holotype: female: Brazil: Santa Catarina. Seara, Nova Teutônia , ix.1962, F. Plaumann col. ( MZUSP) . Paratype: Brazil: Pará. Belém , 25.iv.1965, F. Pirelli & H.S. Lopes col., 1 male ( MZUSP) .

Comments: Abdomens dissected and stored in vials with glycerin and pinned with the specimens.This species is similar to T. punctipennis , differing by the frons being longer (1,5 times longer than wide in T. punctipennis ), brown (brown with yellow central stripe in T. punctipennis ), first flagellomere oval (pointed apically in T. punctipennis ), scutum brownish yellow, darker at lateral margins (brownish yellow with central gray dorsocentral vittae through entire length and dark brown laterally in T. punctipennis ), wing infuscated at costal margin (infuscated at cell bm and base of basal radial cell and r-m spotted in T. punctipennis ).

Figures

FIGURE 4: Trigonometopus mariae 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 and genital chamber. (H) Male terminalia, lateral view. (I) Male terminalia, ventral view.