Quichuana longicauda, Ricarte & Marcos-García & Hancock & Rotheray, 2012

Ricarte, Antonio, Marcos-García, M. Ángeles, Hancock, E. G. & Rotheray, Graham E., 2012, Revision of the New World genus Quichuana Knab, 1913 (Diptera: Syrphidae), including descriptions of 24 new species, Zoological Journal of the Linnean Society (Zool. J. Linn. Soc.) 166 (1), pp. 72-131 : 98-99

QUICHUANA LONGICAUDA RICARTE & HANCOCK SP. NOV.

FIGURES 2 AND 8

Description

Male

Head: Eyes with white hairs, except for the brownish hairs on upper third of the eye; ocellar triangle with black hairs; frontal triangle with long, black hairs centrally and pale hairs laterally; antenna black, except for red arista; basoflagellomere nearly rectangular, round at the apex ( Fig. 2 ); bf = 1.9; face pollinose, with a central, shiny, black stripe, not reaching the antennae, and two lateral stripes slightly narrower than the central stripe (lateral stripes with sparse pollinosity not obscuring the background colour); frontal prominence pollinose ventrally; face with silver, white hairs.

Thorax: Scutum with two pollinose stripes tapering towards the apex, each stripe as wide as half the width of the basoflagellomere; pollinose stripes extending on the anterior two-thirds of the scutum; scutum with long, yellowish white, posteriorly directed hairs, and a few short black hairs above the wings; pleural hairs pale, with some reduced tufts of hairs on PAPT posterodorsally and NP; PC with long, yellowish hairs; scutellum dark brown, with long pale hairs; pro- and mesofemur, tibia, and tarsus dark brown, although tibia and tarsus lighter; metafemur black, with reddish areas apically; metatibia extensively dark brown, red at the very apex; femora and tibiae mainly pale haired; dorsal surface of the apical third of metafemur with short, black, adpressed hairs and spiny black hairs on the ventral surface of the apical third; tarsi with short, black, adpressed hairs dorsally; wings weakly brown pigmented on the surface, anterior to vein R 4+5 (cell C even with lighter pigmentation than that on the rest of the pigmented surface); wing with areas bare of microtrichia on cell R posterior to spurious vein, on most of the basal third of C, most of the basal two-thirds of BM, and most of the basal third of CuP; alula with a semicircular area bare of microtrichia anteriorly; reddish white calypteres with blackish margins; halteres reddish.

Abdomen: Slender and tapering towards the apex; terga black; lateral surface of tergum I with laterally directed hairs; terga with whitish yellow hairs, except for the black hairs on the posterior third of tergum II, posterior two-thirds of tergum III, and posterior third of tergum IV; sterna dark brown.

Genitalia: Similar to that of Q. angustiventris but with superior lobes shorter and more developed on the anterior surface ( Fig. 8 ).

Female

Same as male except eyes with white hairs on the lower half and brown hairs on the upper half; ocellar triangle with whitish yellow hairs; frons with an anteriorly directed chevron of silver pollinosity; frons extensively pale haired; antenna brownish black, narrowly reddish at the apex of pedicel and at the base of basoflagellomere; basoflagellomere slightly wider basally than that in the male; bf ± 2; facial, lateral stripes more faint than those in males because of the presence of denser pollinosity; face with whitish yellow hairs; cells R and R 4+5 pigmented near the vein r–m anteriorly, and on some reduced areas in the cell R centrally; terga with whitish yellow hairs except for a few black hairs on the posterior margin of tergum II, posterior two-thirds of tergum III, and posterior fifth of tergum IV.

Etymology

The noun in apposition ‘ longicauda ’ means ‘long tailed’, and refers to the exceptionally long ‘tail’ of the larva of this species.

Material examined

Holotype ( USNM): 1m reared from larva collected in a bromeliad, Trinidad (19), Lopinot , 22.vii.1998, Gl. Univ. Epdtn /em 5.x.1998 / USNMNH 2050003 .

Paratypes ( HM): TRINIDAD: 1f reared from a larva collected in a bromeliad, Trinidad , Cumuca (3), 28.vii.1998 , Gl. Univ. Epdtn, em 16.xi.1998; 1m, Lopinot (19), larva 22.vii.1998 (ex bromeliad), adult 23.ix.1998; 1f with puparium, Lopinot (17), larva 17.viii.1998 , adult 2.ix.1998; 2f with puparium, Simla, larva 3.vii.1996 (ex Gravisia water tank), det. as Quichuana by EG Hancock 1996; 1f with puparium, Hollis Dam (1), larva 9.vii.1998 (ex bromeliad) , adult 24.vii.1998, Gl. Univ. Epdtn; 1f with puparium, Hollis Dam (1), larva 13.viii.1998 , adult 24.viii.1998; 1f with puparium, Lopinot (19), larva 24.viii.1998 , adult 31.viii.1998; 1f with puparium, Mt. Harris , Phom Road (12), larva 29.vii.1998 (ex bromeliad) , adult 31.viii.1998, Gl. Univ. Epdtn; 1f (partially eaten) with puparium, Lopinot (7), larva 6.vii.1998 (ex paw paw) , adult 28.ix.1998; 1f with puparium, Lopinot (19), adult (?) 29.viii.1998; 1f with puparium, Lopinot, Samaan Tru (1), larva 6.vii.1998 (ex sap run) , adult 12.x.1998, Gl. Univ. Epdtn (loan from USNMNH 2050003 ) .

Range

Trinidad and Surinam (specimens from Menno Reemer).

Taxonomic notes

Small species (9.1 mm, holotype) with slender abdomen; although males of Q. longicauda sp. nov. can be readily separated from males of Q. angustiventris by the absence of a thick mat of yellow hairs obscuring the background colour of the frontal triangle, genitalia are similar in both species; genitalia of Q. longicauda sp. nov. differ from genitalia of Q. angustiventris in having superior lobes shorter and more developed on the anterior surface ( Fig. 8 ); in both males and females of Q. longicauda sp. nov. the basoflagellomere is shorter and wider ( Fig. 2 ) than that in the similar Q. picadoi ( Fig. 75, 76 ), and the wing is more extensively bare of microtrichia than in the latter species.

Figures

Figures 1–2. Quichuana right antennae, lateral inner view: 1, Quichuana amazonica sp. nov., male holotype; 2, Quichuana longicauda sp. nov., female paratype; l, distance from top of basoflagellomere and most prominent point of pedicel; w, width of basoflagellomere at the level of the arista base. Scale bar: 1 mm.

Figures 5–8. Quichuana male genitalia. 5–7, Quichuana angustiventris: 5, hypandrium, lateral view; 6, epandrium, lateral view; 7, left half of epandrium, anterior view. 8, Quichuana longicauda sp. nov., apical part of hypandrium, lateral view. Scale bars: 0.5 mm.

Figures 73–79. Features of the ‘slender’ and ‘robust’ species of Quichuana. 73–76, ‘slender’ species. 73, Quichuana angustiventris, male from Trinidad with attached puparium, overall appearance, dorsal view; scale bar = 2 mm. 74, Quichuana calathea, male from Costa Rica, eye contiguity and vertical triangle; scale bar = 0.5 mm. 75–76, Quichuana picadoi, male: 75, anterior view; 76, lateral view; scale bar = 1 mm. 77–79, ‘robust’ species. 77, Quichuana fasciata, female lectotype, overall appearance, dorsal view; scale bar = 2 mm. 78, Quichuana dissimilis sp. nov., male holotype, eye contiguity and vertical triangle; scale bar = 1 mm. 79, Quichuana atra sp. nov., female, anterior view; scale bar = 1 mm.