Calycomyza platyptera (Thomson, 1869)

Agromyza platyptera Thomson, 1869: 608 .

Phytobia (Calycomyza) platyptera, Frick, 1952: 395

Calycomyza platyptera, Spencer, 1981: 307 .

Diagnosis. Wing length 1.5–2 mm. Fronto-orbital plate predominantly yellowish, darkened to upper fronto-orbital seta; face black in upper half, yellowish below; pedicel brown; legs brown; calypter yellowish, fringe yellowish. Aedeagus (Fig. 878 and 879 in Spencer & Steyskal 1986): basiphallus slightly sclerotized; mesophallus elongated, wider basally; reniform sclerite present between mesophallus and distiphallus; distiphallus short, forming two lobes and with paired distal processes.

Host-plants. Asteraceae— Ambrosia artemisiifolia L., Arctium sp., Artemisia douglasiana Besser, Artemisia ludoviciana Nutt., Artemisia vulgaris L., Bidens Pilosa L., Baccharis salicifolia (Ruiz & Pav.) Pers., Erigeron sp., Erigeron canadensis L., Gamochaeta pensylvanica (Willd.) Cabrera, Grindelia squarrosa (Pursh) Dunal, Helianthus annuus L., Helianthus exilis A. Gray, Heterotheca grandiflora Nutt., Iva frutescens L., Mikania micrantha Kunth, Mikania scandens (L.) Willd., Silphium laciniatum L., Silphium perfoliatum L., Solidago caesia L., Soli- dago tortifolia Elliot., Symphyotrichum simmondsii (Small) G.L. Nesom, Xanthium strumarium L., Zinnia elegans (Jacq.) .

Distribution. Argentina, Brazil, Canada, Cuba, Ecuador, Guadeloupe, Jamaica, USA.

Material examined. BRAZIL, Pará state, Belém: Campus de Pesquisa do Museu Paraense Emílio Goeldi, 1º26′56.3″S, 48º26′43.2″W, 21-IX-1991, M.C. Esposito [collector], ex leaf of Zinnia elegans (4 ♂); same location, 21-IX-1991, M.C. Esposito [collector], ex leaf of Zinnia elegans (3 ♀) .

Comments. Calycomyza platyptera has already been associated to 19 genera of host-plants belonging to the Asteraceae family (Benavent-Corai et al. 2005; Eiseman & Lonsdale 2018), forming blotches on the surface of the leaf. The yellowish fronto-orbital plate, white calypter and fringe, legs completely brown and the tubular aedeagus are helpful to distinguish C. platyptera from many others species of Calycomyza . Among species of this genus with a tubular aedeagus, especially that mining Asteraceae, C. platyptera has an aedeagus similar to C. obscura Spencer, C. promissa (Frick), C. minor (Spencer) e C. solidaginis (Kaltenbach), distinguished by the sclerotized extensions present apically in the distiphallus. This set of characteristics are useful to distinguish C playtera from others species of Calycomyza .