Trigonometopus boraceiensis, 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 : 135-137

Trigonometopus boraceiensis sp. nov.

( Figs. 2 A-I)

Diagnosis: Brownish yellow integument. Ocellar seta absent; postocellar setae cruciate. Antennal scape as long as pedicel. Thorax dark brown, with yellow stripes. Wing infuscated slightly brownish with dark brown median stripe. Female abdomen without modified sternites; 3 rounded spermathecae; epiproct present as a slender belt. Male terminalia: epandrium rectangular; surstylus rounded, articulated with epandrium.

Description: Male: Head ( Figs. 2A, 2B, 2C ): Rounded vertex, yellow; posterior edge of vertex distinctly concave from dorsal view; ocellar triangle placed slightly anterior of vertex, strongly raised, dark brown. Frons rectangular, two times longer than wide; yellow; flat in profile; proclinate setulae in anterior margin densely present to half way to vertex, including base of anterior fronto-orbital seta; anterior margin, in dorsal view, straight; lunule exposed. Face yellow, bare; lower facial margin wide; facial length almost four times its upper width. Eye oval, longer than high, brownish. Parafacial brownish yellow, and yellow between eye and face; narrow. Gena brown, with short setulae. Occiput yellowish brown. Antenna yellowish brown, inserted in a facial depression: scape as long as pedicel; first flagellomere rounded; arista pubescent, inserted submedially at first flagellomere. Chaetotaxy: outer vertical seta divergent, ½ length of inner vertical seta, reclined; ocellar seta absent; postocellar setae cruciate; both anterior fronto-orbital seta and posterior frontoorbital seta reclinate, anterior seta ¾ length posterior seta; 3 genal setae; supravibrissal setae reaching base of face; occipital setae in two rows. Thorax: Scutum flat; dark brown, with one wider medial and two narrow yellow stripes; pleural region light brown, postpronotal lobe with a yellow spot, katepisternum dark brown; scutellum triangular, rounded apex, flat, brownish with yellow central stripe; anepisternum haired, brownish spotted; katepisternum haired. 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; 1 presutural supra-alar seta; 1 postalar seta; 1 anepisternal seta; 1 katepisternal seta; 2 scutellar setae, apical pair divergent. Legs: Brownish yellow. Chaetotaxy: fore coxa with 2 apical setae; fore femur with one posterodorsal, one posteroventral and one posterior rows of setae; fore tibia with 2 apical setae: 1 anterior and 1 posterodorsal; mid coxa with 2 strong basal setae and 1 row of apical setae; mid femur with 1 short and strong posterior seta; mid tibia with 2 apical setae: 1 anterodorsal and 1 ventral; hind coxa with 1 apical seta; hind femur with 1 anterodorsal seta; hind tibia with 1 apical anteroventral spine. Wing ( Fig. 2D ): Infuscated slightly brownish with dark brown median stripe; anterior margin withish till apex of R 2+3 and with brown stripe from R 4+5 till CuA 2 +A 1; Sc and R1 paler than the other veins; costa sapromyziform; crossvein r-m located before midpoint of discal medial cell; crossvein dm-cu located at midpoint of cell r 4+5; longitudinal veins parallel; vein A 1 short, ending halfway to wing margin. Halter brownish yellow. Abdomen: Dark brown, lateral and central regions yellowish. Terminalia: Epan- drium ( Figs. 2H, 2I ) rectangular. Surstylus articulated with epandrium; rounded. Hypandrium as an almost complete ring around phallus base; with long medial projection; phallapodeme as a long tube; phallus not seen. Female ( Figs. 2E, 2F ): As males, except for the following features: sternites not modified. Epiproct present as a slender belt. Cercus long. Terminalia: With 1+2 spermathecae configuration, rounded, with short ducts ( Fig. 2G ).

Etymology: The specific epithet boraceiensis is a homage to the type-locality, “Estação Biológica de Boracéia”, where the holotype was collected. To be treated as a noun in apposition.

Type material: Holotype: male; Brazil: São Paulo. Salesópolis , 14.viii.1947, E. Rabello & Trav. F. & J. Lane col. ( MZUSP) . Paratype: 1 female, Brazil: Santa Catarina. Seara, Nova Teutônia , ix.1967, F. Plaumann col. ( MZUSP) .

Comments: The abdomen of both types was dissected and stored in vials in glycerin, pinned with the specimens.

Figures

FIGURE 2: Trigonometopus boraceiensis 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.