Hypselosyrphus maurus, Reemer, Menno, 2013

Reemer, Menno, 2013, Taxonomic exploration of Neotropical Microdontinae (Diptera: Syrphidae) mimicking stingless bees, Zootaxa 3697 (1), pp. 1-88 : 29-32

Hypselosyrphus maurus spec. nov.

Figs 76–82 , 110 .

Studied type specimens. HOLOTYPE. FRENCH GUYANA. Male. Label 1: " FRENCH GUIANA / Kaw Mountains / 4°32.893'N 52°10.245'W / Leg. V. Soon 29.12.2002. Coll. RMNH.

PARATYPE. FRENCH GUYANA: 1 female, Kaw Road, PK 37, Relais Patawa, N 4°32'42" / W 52°9'9", IX.2008 (malaise trap), leg. O. Morvan, coll. RMNH.

Additionally studied specimens. PERU: 1 female, Madre de Dios, Rio Tambopata, Sachavacayoc Centre, 12°51'S- 69°22'W, malaise trap, 4-10.IX.2009, leg. J.T. Smit, coll. RMNH.

Redescription (based on holotype)

Adult male Body size: 7 mm.

Head. Face occupying 1/5 of head width in frontal view; shining black; long black pilose on lateral ¼, also with some white pile ventrolaterally; grey pollinose on lateral 1/4. Gena hardly developed. Oral cavity directly bordering eye margins; with lateral margins not produced. Frons shining black, dark pilose. Vertex strongly produced, shining black; black pilose. Occiput black; narrow; with anterior row of dorsally orientated short black pile on dorsal 1/2; with posterior row of posteriorly orientated pale pile over entire length; entirely pollinose. Eye entirely with short, pale pile, about as long as ommati diameter. Antennal fossa about as wide as high. Antenna brown; antennal ratio 4:1:4. Basoflagellomere with acute apex; with small sensory pit at half the length of the segment. Arista pale, about as long as basoflagellomere.

Thorax. Black. Scutum densely black pilose, except for medially interrupted transverse fasciae of shorter white pile along suture. Postpronotum and postalar callus black pilose. Scutellum apicomedially sulcate, without calcars; directed upward, making an angle with the scutum of about 30°; black pilose. Anepisternum a little convex, no clear division between anterior and posterior part; anterior part black pilose, posterior part with a few black pile along posterior margin. Anepimeron entirely black pilose. Katepisternum black pilose dorsally; bare ventrally. Katatergum long microtrichose. Anatergum short microtrichose. Other pleurae bare. Calypter dark grey, halter brown with knob blackish.

Wing: hyaline, veins darkened around stigmal crossvein, veins around pterostigma yellow; microtrichose, except on 1st costal cell, basal 1/2 of 2nd costal cell, basal 1/10 of cell r1, entirely on cell br except microtrichose along vena spuria , posterior 1/2 of cell bm, basal 1/3 of cell cup.

Legs: Black, except fore- and middle-tarsi yellow and apical four tarsomeres of hindleg yellow; black pilose, except yellow pilose on apical two tarsomeres. Hind tibia strongly widened, with greatest width at apical 1/3, about 1.5 times as wide as posterior femur at largest width; with strong excavation at cicatrice (lateral view); pilosity about half as long as width of tibia. Hind-basitarsus enlarged; about 1.5 times as wide as apex of metatibia in dorsal view. Coxae and trochanters blackish, with black pile.

Abdomen. More or less oval, wider than thorax, with largest width at posterior 1/3 of tergite 2; blackish brown. Tergite 1 shining, tergite dull except for shining median 1/3, tergite 3 dull except shining along lateral margins, tergite 4 shining. Tergites black bilose, except tergite 1 and posterior and lateral margins of tergite 4 white pilose. Sternite 1 white pilose, other sternites black pilose. Genitalia as in fig. 110.

Female. As male, except for usual sexual dimorphism. In the paratype, the colouration of the wing veins is entirely uniform (not dark around stigmal crossvein and yellow around pterostigma). In the additionally studied female from Peru, however, the colouration of the wing veins is as in the male holotype. These differences are considered to be intraspecific.

Etymology. The specific epithet maurus (Latin for 'dark') refers to the black appearance of this species.

Diagnosis. 7–8 mm. Recognized by the following combination of characters: scutellum sulcate, alula entirely microtrichose, hind tibia brown and black pilose, abdomen black.

Distribution. Known from French Guyana and Peru.

Figures

FIGURES 76 – 84. 76 – 80. Hypselosyrphus maurus male (holotype). 76. habitus dorsal; 77. habitus lateral; 78. head frontal; 79. head lateral; 80. wing. 81 – 82. Hypselosyrphus maurus female (paratype). 81. habitus dorsal; 82. habitus lateral. 83 – 84. Hypselosyrphus pingo female (holotype). 83. habitus dorsal; 84. habitus lateral.

FIGURES 107 – 112. 107. Hypselosyrphus vexillipennis female (holotype), head frontal. 108 – 112. Hypselosyrphus, male genitalia. 108. H. amazonicus (Peru. coll. RMNH); 109. H. anax (holotype); 110. H. maurus (holotype); 111. H. pingo (paratype); 112. H. ulopodus (holotype) (dashed lines indicate missing part in specimen).