Trigonometopus, MACQUART, 1835

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 : 133

Key for the Neotropical species of Trigonometopus

1. Body grey; wing with brown bands ( Fig. 1D ); ocellar setae longer than posterior fronto-orbital seta ( Fig. 1A ) ............................................................................................... T. assisensis Lima & Silva , sp. nov.

— Body brownish or yellowish; wing unspotted or with stripes; ocellar setae no longer than posterior frontoorbital seta or absent ...............................................................................................................................2

2. Wing membrane with milky costal margin extending to apex of vein R 4+5 ................. T. albocostatus Hendel

— Wing membrane without milky costal margin ...........................................................................................3

3. Presutural dorsocentral seta present............................................................................................................4

— Presutural dorsocentral seta absent .............................................................................................................7

4. Wing hyaline; pleural region dark; prescutellar acrostichal setae tiny; dorsocentral setae 1+2 ....................... ....................................................................................................................... T. immaculipennis Malloch

— Wing infuscated, sometimes spotted; pleural region pale; prescutellar acrostichal setae well developed; dorsocentral setae variable ............................................................................................................................5

5. Wing membrane with two dark spots along the apical section of vein R 4+5; dark spots at both ends of dm-cu crossvein ( Fig. 4D )..................................................................................................................................6

— Wing without spots .............................................................................................. T. rotundicornis Williston

6. Wing infuscated at costal and anterior margins.......................................... T. mariae Lima & Silva , sp. nov.

— Anterior margin of wing not infuscated ............................................................... T. punctipennis Coquillett

7. Ocellar seta present....................................................................................................................................8

— Ocellar seta absent .....................................................................................................................................9

8. Wing hyaline; pleura yellow; apical scutellar setae with setigerous spot ............................. T. albifrons Knab

— Wing infuscated ( Fig. 3D ); pleura brownish; apical scutellar setae without setigerous spot .......................... ............................................................................................................ T. lourdesae Lima & Silva , sp. nov.

9. Genal margin with dark stripe; postocellar setae convergent; apex of first flagellomere almost triangular ..... ............................................................................................................................... T. angustipennis Knab

— Genal margin not darkened ( Fig. 2A ); postocellar setae cruciate ( Figs. 2B‒C ); apex of first flagellomere rounded ........................................................................................... T. boraceiensis Lima & Silva , sp. nov.

Figures

FIGURE 1: Trigonometopus assisensis sp. nov. (A) Head, lateral view. (B) Head, dorsal view. (C) Head, frontal view. (D) Wing. (E) Female abdomen, ventral view. (F) Female abdomen, lateral view. (G) Spermathecae and genital chamber. (H) Male terminalia, lateral view. (J) Male terminalia, ventral view.

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.

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.

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.