Quichuana nigropilosa Montoya & Ricarte

Montoya, Augusto L., Ricarte, Antonio & Wolff, Marta, 2017, Two new species of Quichuana Knab (Diptera: Syrphidae) from the paramo ecosystems in Colombia, Zootaxa 4244 (3), pp. 390-402 : 396-397

Quichuana nigropilosa Montoya & Ricarte sp. n.

Figures 1 , 4B, 4 D, 6A–D.

Length (n = 1). Body 13.4 mm; wing 11.4 mm.

Diagnosis. Large species (13.4 mm) with a broad black abdomen. The species is characterized by three faint, medial, grayish pollinose vittae on the scutum reaching the posterior margin; pleuron black pilose; wing extensively bare of microtrichia on posterior half; capitulum white; coxae black pilose; terga I–V black pilose, with a shiny black pollinose band on posterior margin.

Description. FEMALE. Head ( Figs 6 A–B). Face black, white pollinose, white pilose; tubercle distinct, with a narrow medial shiny vitta not reaching the antennae and the mouth edge. Gena broad, shiny black. Lunule black; frontal triangle mainly black pilose, except for the golden yellow pile along eye margin. Antennae black, black pilose, basoflagellomere dark brown, round to oval, white pollinose, bf = 1.3; scape black pilose; pedicel golden yellow pilose ventrally, black pilose dorsally; arista orange, bare. Eye yellowish pilose, bare along posterior margin; frontal vertical triangle whitish gray pollinose on anterior corner; ocelli reddish, ocellar triangle black pilose; occiput white pollinose, with a line of long black pile intermixed on dorsal half. Thorax ( Fig. 6 C). Black, scutum with a faint gray-brown pollinosity, with black and yellowish pile intermixed, scutum with three faint, medial, grayish pollinose vittae reaching the posterior margin, this area with black pile; postpronotum, notopleuron and postalar callus with golden yellow and black pile intermixed; posterior anepisternum black pilose dorsally, with some white pile intermixed dorsally; pleuron dull grayish pollinose; katepisternum black pilose; katatergum short brownish pilose; scutellum opaque brownish, shiny black on marginal corner, long black pilose; metasternum black pilose; calypter brown, brown pilose marginally; plumula brown; spiracular fringe brownish; halter pedicel white; capitulum white. Wing ( Figs 4 C, 6C–D). Microtrichose, except for extensive bare areas on posterior half (cells cua1, cup, dm, bm and anal lobe), slightly dark infuscate on anterior margin (cells c, sc, r1, r4+5, dm and bm); tegula and basicosta with black pile, alula bare medially. Legs ( Figs 4 D, 6B). Black, extensively black pilose; coxae and trochanters black, black pilose, pro and mesotrochanter white pilose dorsally; femora black, black pilose, except for the pro and mesofemur golden pilose on anterior edge; metafemur swollen, with long black pile ventrally; tibiae black, black pilose, pro-tibia golden pilose antero-ventrally, meso-tibia white pilose anteroventrally, metatibia extensively with black pile, except for the white pile on anterior and posterior edge; tarsi black, black pilose dorsally, orange pilose ventrally, mesotarsus with rows of ventral black pile. Abdomen ( Fig. 6 C). Black, opaque, without markings, extensively covered with black pile; terga I–V with a posterior shiny black margin; tergum I with a moustache arrangement of sparse black pile; tergum II yellow pilose on basal fourth, black pilose posteriorly; terga III–V extensively black pilose; sterna black, sterna I–V with long golden pile, in addition to some laterally black pile intermixed. MALE. Unknown.

Material examined. HOLOTYPE: female, deposited at the CEUA, and labelled: COLOMBIA: “ Antioquia, Betulia, Vereda El Indio, La Mina , Alto de San José / 6.251447, -76.044872, 3092m, transición / 2013. xii.14-18, C. Henao; J. Cogollo. Leg. ( CEUA 87092 )”. “ Holotype / Quichuana nigropilosa / Montoya & Ricarte 2017”. [red, handwritten except first line].

Distribution. Eastern slope of Cordillera Occidental, Antioquia, Colombia (3092 m. a. s. l.) ( Fig. 1 ).

Etymology. The epithet ‘nigropilosa’ (from the Latin ‘ nigro ’, black, and the Greek ‘ pilos ’, pile) refers to the typical black pile of the body of this singular species.

Taxonomic notes. Although Q. nigropilosa sp. n. is described from a single female, we evidenced that the species differs significantly from Q. citara sp. n., Q. melas and Q. atra (see ‘Taxonomic notes’ under Q. nigropilosa and Table 1). Another important feature is its restricted distribution, which raises the need for further expeditions to neighboring areas of the type locality, in order to increase the knowledge about species distribution, as well as finding male specimens.

Habitat and co-occurrence with other flower fly species. Quichuana nigropilosa sp. n. co-occurs in the paramo de Frontino with the species Argentinomyia browni Fluke , A. luculenta Fluke , A. rex Fluke , Dasysyrphus lotus (Williston) , Fazia fascifrons (Macquart) and Ocyptamus eblis (Hull) .

TABLE]. Morphological đifferences between Quichuana citara sp. n., Q. nigropilosa sp. n., Q. melas Ricarte & Marcos-García anđ Q. atra Ricarte & Marcos-García.

Figures

FIGURE 1. Distribution map of Quichuana citara sp. n., Q. nigropilosa sp. n., Q. cf. fasciata, Q. dolorosa and Q. quixotea in Colombia.

FIGURE 4. A – B. Quichuana citara sp. n., female, paratype (CEUA 87045). A: Detail of wing microtrichia, dorsal view; B: Posterior leg, lateral view. C – D. Quichuana nigropilosa sp. n., female, holotype (CEUA 87092). C: Detail of wing microtrichia, dorsal view; D: Posterior leg, ventral view.

FIGURE 6. Quichuana nigropilosa sp. n., female, holotype (CEUA 87092). A: head, frontal view; B: lateral view; C: abdomen, dorsal view; D: right wing, dorsal view.