Quichuana dissimilis, 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 : 90-91

QUICHUANA DISSIMILIS RICARTE & ROTHERAY SP. NOV.

FIGURES 38, 39 , AND 78

Description

Male (holotype)

Head: Eye hairs whitish and sparse on the lower half of the eye, and brown and denser towards the upper half; vertical triangle black with white pollinosity on the anterior corner and, on the ocellar triangle, long black hairs; frontal triangle black, with long black hairs except for the line of brownish white hairs on the eye margins; dorsal surface of the frontal triangle brownish near the antennae; antenna with arista red; scape black; pedicel and basoflagellomere blackish red; basoflagellomere oval; bf = 1.1; scape and pedicel with black hairs; ventral surface of the frontal prominence reddish, with white pollinosity below the antennae; black face, with most of the hairs brownish white; face with a bare, central, shiny stripe from the mouth edge to the bottom of the frontal prominence; facial pollinosity white and restricted to a narrow line at the eye margin and a stripe extending from the eye margin to the mouth edge laterally; occiput white pollinose, with white hairs and, on the upper third, scattered black hairs intermixed.

Thorax: Black; scutum with two medial, approximated, greyish pollinose, tapering stripes, faintly reaching the posterior margin of the scutum (the rest of the scutum covered with darker pollinosity); scutum with reddish hairs and, above the wings and the anterior area of the PC, black hairs; NP, PAPT posterodorsally, and PC posteriorly with conspicuous tufts of golden yellow hairs; scutellum brown, nearly black on the lateral corners; scutellum with long red hairs and a few long black hairs intermixed; anterior and posterior spiracles pale; apical half of pro- and mesofemur with red markings; metafemur black, with red markings on the apical third; pro- and mesotibia extensively red; protibia with a blackish ring near the apex; metatibia red on the basal half; tarsi red, except for the darker metatarsomeres 3–5; femora and tibiae with both pale and dark hairs; wing entirely microtrichose, very lightly brown pigmented anteriorly.

Abdomen: Terga II–IV each with red markings laterally and posteriorly; posterior half of tergum II with a band of black hairs reaching the lateral margins; posterior half of tergum III with black hairs medially; tergum I with a moustache arrangement of golden yellow hairs nearly obscuring the background colour of the tergum, with a central gap of a third of the tergum width; sterna black with long pale hairs, except for scattered black hairs on sternum IV.

Genitalia: Hypandrium similar to that in Q. bromeliarum sp. nov. ( Fig. 25 ); base of the surstyli about twice wider than the apex; surstyli gently concave posteriorly and, from mid height, abruptly tapering anteriorly ( Fig. 38 ); inner side of the surstyli with a triangular expansion ( Fig. 39 ).

Female

Unknown. Etymology

The epithet ‘ dissimilis ’ means ‘different’, and refers to the surstyli of the male genitalia, which is a distinctive character of this species with respect to the similar Q. bromeliarum sp. nov.

Material examined

Holotype: 1m with the right leg missing, Typus!/ Bolivia-Mapiri, 9. II.03, Sarampioni 700 m (date and altitude handwritten)/ Coll W Schnuse, 1911-3/ Myiathropa fasciata Sack (handwritten)/ ♂ / Staatl. Museum für Tierkunde, Dresden / USNM ENT 00022385 ( SNSD).

This specimen is labelled as ‘ Typus!’, and was together with the specimen labelled as M. fasciata var. nigriventris (see under Q. boliviana sp. nov.) in the collection SNSD. No published reference to this variety has been found in the literature, and this is therefore a manuscript label. This specimen cannot be part of the type material of the species M. fasciata because this species was described from Peruvian specimens according to Sack (1941).

Range

Bolivia.

Taxonomic notes

Large species (12.9 mm) with broad abdomen, most similar to Q. bromeliarum sp. nov. and Quichuana montana Hull, 1951 . Quichuana dissimilis sp. nov. is readily separated from Q. montana by the shape of the superior lobes ( Figs 25 , 56 ) and surstyli ( Figs 38, 39 , 57 ). For distinguishing characters, see ‘Taxonomic notes’ under Q. bromeliarum sp. nov.

QUICHUANA DOLOROSA HULL, 1946

Figures

Figures 38–39. Quichuana dissimilis sp. nov. male holotype genitalia: 38, epandrium, lateral view; 39, left half of epandrium, anterior view. Scale bar: 1 mm.

Figures 25–27. Quichuana bromeliarum sp. nov. male genitalia: 25, hypandrium, lateral view; 26, epandrium, lateral view; 27, left surstylus, anterior view. Scale bar: 1 mm.

Figures 56–57. Quichuana montana male holotype genitalia, lateral view: 56, hypandrium; 57, epandrium. Scale bar: 1 mm.