Hypselosyrphus amazonicus Reemer, 2013

Reemer, Menno, 2013, Taxonomic exploration of Neotropical Microdontinae (Diptera: Syrphidae) mimicking stingless bees, Zootaxa 3697 (1), pp. 1-88 : 23-25

Hypselosyrphus amazonicus Reemer, 2013

Figs 58–66 , 108 .

Hypselosyrphus amazonicus Reemer , in Reemer & Ståhls 2013: 132. Replacement name. Microdon (Ubristes) scutellaris Shannon, 1927: 20 . Preoccupied by Schummel (1842).

Studied type specimens. HOLOTYPE. BRAZIL. Female. Label 1 (small, round, red-bordered): " Holotype "; label 2: "Amazon. 6653"; label 3: " Microdon Ubristes scutellaris Snn.". Leg.: H.W. Bates (Shannon 1927), coll. BMNH.

Aditionally studied specimens: PERU: 1 male, Madre de Dios, Rio Tambopata, Sachavacayoc Centre, 12°51'S – 69°22'W, mal. trap 26–28.X.2008, leg. J.T. Smit, coll. RMNH.

Redescription (based on holotype)

Adult female Body size: 8 mm.

Head. Face occupying 1/5 of head width in frontal view; black; entirely with long white pilosity, with lateral 1/ 4 along eye margins white pollinose. Gena hardly developed. Oral cavity directly bordering eye margins; with lateral margins not produced. Frons black; white pilose. Vertex more or less convex, dull black; white pilose anteriorly, black pilose posteriorly; ocellar triangle not elevated compared to rest of vertex. Occiput black; very narrow, barely visible in lateral view; with anterior row of dorsally orientated black pile on dorsal 1/3; with posterior row of posteriorly orientated pale pile on ventral 2/3. Eye entirely with short, pale pile, a little longer than ommati diameter. Antennal fossa about as wide as high. Antenna yellow; antennal ratio 4:1:? (basoflagellomeres missing in holotype; Shannon 1927 gives an antennal ratio of 1:0.25:1).

Thorax. Dark brown. Scutum densely black pilose, except for a few white pile along transverse suture. Postpronotum and postalar callus black pilose. Scutellum equilaterally triangular, with posterior corner quite blunt; directed upward, making an angle with the scutum of about 40°; paler brown than scutum; long black pilose anteriorly and dorsally, long pale pilose posteroventrally. Anepisternum a little convex, no clear division between anterior and posterior part; anterior part black pilose, posterior part bare. Anepimeron entirely black pilose. Katepisternum black pilose dorsally; with a few pile ventrally. Katatergum long microtrichose. Anatergum short microtrichose. Other pleurae bare. Calypter grey, halter yellowish.

Wing: hyaline, subtly tinged with brown; with vague, dark transverse fascia on anterior half just before middle of wing, and with vague, whitish transverse fascia just after middle of wing. Microtrichose, except for most of cell br (except for traces of microtrichia along vena spuria ), posterobasal 1/2 of cell bm, anterobasal 2/5 of cell cup, and on basomedian 1/2 of alula.

Legs: Blackish brown, except for whitish yellow last three tarsomeres of front- and hindlegs (mid-tibia and - tarsus missing in holotype); black pilose, except pale pilose on pale tarsomeres. Hind-tibia with greatest width apically of middle; about as wide as hind femur; with strong excavation at cicatrice (lateral view); pilosity about as long as width of tibia. Hind-basitarsus enlarged; about twice as wide as tibia in dorsal view. Coxae and trochanters brownish black, with black pile.

Abdomen. Oval, 1.5 times as wide as thorax, with largest width at tergite 3 (which only slightly narrows posteriorly). Yellowish brown; with wide dark lateral margins, dark posterior margins of tergites 2, 3 and 4, and a narrow median vitta; tergite 5 yellow with dark median vitta. All sternites yellow and yellow pilose.

Male. As female. The studied male is darker in overall colouration than the female holotype, but possibly the holotype has lost some of its colour over time.

Diagnosis. This is the only known species of Hypselosyrphus with a triangular scutellum.

Notes. The name Microdon scutellaris Shannon, 1927 is a junior primary homonym of Microdon scutellaris Schummel, 1842 . In such cases it is a good custom to name the species after the person who described it first. In this case however, the name shanonni is preoccupied too by Curran (1940), so another name was chosen: amazonicus , referring to the apparent distribution of the species. This name was introduced by Reemer in Reemer and Ståhls (2013a).

Distribution. Known from Brazil and Peru.

Figures

FIGURES 55 – 62. 55 – 57. Ceratophya, male genitalia. 55. C. notata (holotype); 56. C. panamensis (holotype); 57. C. scolopus (holotype). 58 – 62. Hypselosyrphus amazonicus male (Peru, coll. RMNH). 58. habitus dorsal; 59. habitus lateral; 60. head frontal; 61. head lateral; 62. wing.

FIGURES 63 – 71. 63 – 66. Hypselosyrphus amazonicus female (holotype). 63. habitus dorsal; 64. habitus lateral; 65. scutellum; 66. wing. 67. Hypselosyrphus anax male (holotype), habitus dorsal. Photo: American Museum of Natural History. 68 – 69. Hypselosyrphus corbiculipes female (holotype). 68. habitus dorsal; 69. habitus lateral. 70 – 71. Hypselosyrphus helvus female (holotype). 70. habitus dorsal; 71. 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).