Toxomerus mosaicus, Borges & Couri, 2009

Borges, Zuleica M. & Couri, Marcia S., 2009, Revision of Toxomerus Macquart, 1855 (Diptera: Syrphidae) from Brazil with synonymic notes, identification key to the species and description of three new species 2179, Zootaxa 2179, pp. 1-72 : 41-42

Toxomerus mosaicus sp. nov

( Figs. 1, 8, 15, 31, 59, 60, 61, 113, 114, 115)

Male. Head: face 1/3 as long as eye width, shiny yellow, sparsely white pollinose and pilose laterally ( Fig. 1); gena brown; frontal triangle yellow, white pilose; vertical triangle narrow, elongate, black, bronze pollinose, black pilose; occiput black, silver pollinose, with thick white pile, with a short row of brownish pile superiorly; antenna yellow to brownish, black pilose, arista brown.

Thorax: postpronotum yellow; proepisternum black, dull pollinose, yellow pilose; supracoxal yellow macula present; scutum black except broadly yellow laterally, bronze pollinose except for greyish pollinose medial vitta, yellow pilose; scutellum brown with yellow margins or all brownish, black pilose; anepisternum black except yellow posterior 1/2, yellow pilose; katepisternum black except dorsal 1/3 yellow, dull, yellow pilose; anepimeron black, yellow dorsomedially; plumula yellow; calypter yellowish with yellowish fringe except brown fringe on dorsal lobe; posterior mesothoracic pleuron (katepimeron, meron, katatergum, anatergum and postscutellum) black; methatoracic pleuron yellow; metasternum brown; halter yellow ( Fig. 8). Legs: pro- and mesolegs yellow except coxae black; yellow pilose except as follow, profemur black pilose on 1/3 dorsoapical, mesofemur black pilose; metacoxa yellow, yellow pilose; metafemur yellow, black pilose; metatibia yellow, yellow and black pilose, metatarsus brown dorsally and yellow ventrally, black pilose dorsally and yellow pilose ventrally. Wing: hyaline, extensively microtrichose; bare only: on basal 1/3 of cell C, basal 1/6 of cell R1, basal 2/3 of cell R and basal 2/3 of cell BM; alula broad, broader than cell Bm appically, microtrichose ( Fig. 15).

Abdomen: 1st tergum black except narrowly yellow basolaterally, yellow pilose; 2nd tergum black except yellow cross medially with not connected transversal strip, yellow pilose; 3rd to 5th tergum black with different shapes of yellow macula, black pilose; sterna yellow, yellow pilose ( Fig. 31). Male genitalia: surstylus almost all with the same width, with long bristles on dorsal surface; postanal process 3/4 as long as surstylus; aedeagus enlarged, proeminent dorsally and ventrally; superior lobe somewhat rectangular, forked dorsally, with erect bristles in distad anterior margin and scattered hairs ( Figs. 59–61).

Female. Similar to male except for normal the frons black, bronze pollinose, black pilose; fronto-orbital plate. black on 1/3 superior and yellow on 2/3 inferior, bronze pollinose, black pilose. Anterior anepisternum bare. Female genitalia: 9th tergum with almost pentagonal black macula basomedially; epiproct reduced; cercus slender; hypoproct with ogive-like shape; 9th sternum with deep median scavation on anterior margin; two spermatecae rounded, with the same size ( Figs. 113–115).

Length: body 8.3–9.5 mm. Wing 6.9–8.3 mm.

Discussion. Toxomerus mosaicus is a large species, morphologically similar to T. undecimpunctatus , both having similar male genitalia, but the new species differs from T. undecimpunctatus in having a longer postanal process and different abdominal pattern, reminding a mosaic. Material of this species was found in various collections identified by Hull as T. fragmentaria Hull , but there is no paper about that.

Etymology: The term mosaicus comes from the Greek word mouseîn that means small pieces with many shapes to form some design. T. mosaicus has some small yellow macula on abdomen reminding the mosaic pieces.

Type material. Holotype. BRAZIL. Santa Catarina: Nova Teutônia , male, VI/1964, F. Plaumann ( USNM) . Paratypes. BRAZIL. Santa Catarina: Nova Teutônia , 2 ♂ & ♀, V/1970, F. Plaumann ( USNM) ; ♀, IV/196_, F. Plaumann ( CNC) ; 4 ♀, V/1970, F. Plaumann ( MZSP) ; ♂, III/1971, F. Plaumann ( MZSP) ; Rio Grande do Sul: Rio Pardinho , ♂, 09/IV/2003, Marcel G. Hermes ( MNRJ) .

Geographical record. Southeastern Brazil.