Trigonometopus MACQUART 1835
Creators: name: Lima, Ângela Maria Alves de
name: Silva, Vera Cristina
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Lauxaniidae
Trigonometopus

description: 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.
description: Published as part of Lima, Ângela Maria Alves de & Silva, Vera Cristina, 2015, Four new Neotropical species of Trigonometopus Macquart, 1835 (Diptera, Lauxaniidae), pp. 131-142 in Papéis Avulsos de Zoologia (São Paulo) (São Paulo) 55 (9) on page 133, DOI: 10.1590/0031-1049.2015.55.09, http://zenodo.org/record/4656507