Surimyia reemeri, Carvalho-Filho, Fernando Da Silva, 2014

Carvalho-Filho, Fernando Da Silva, 2014, Description of new species of Surimyia Reemer and Carreramyia Doesburg (Diptera: Syrphidae) from the Brazilian Amazon, Zootaxa 3887 (1), pp. 79-87 : 80-83

Surimyia reemeri sp. n. ( Figs 1–6 )

Diagnosis. Antenna with basoflagellomere longer than scape. Face yellow with a median brown mark. Cercus clubbed. Surstylus long, about twice the length of the cercus. Ejaculatory apodeme T-shaped. Hypandrium triangular. Aedeagus furcate apically.

Description. MALE. Body length 4.3 mm (n = 1). Head ( Figs 1–3 ). Eye red and bare; ocellar triangle shiny black; yellow frons with a brown macula on dorsal eye margin, a brown mark surrounding ocellar triangle that narrows posteriorly and reaches a rounded dark brown mark above antennal fossa; frons with scattered black pile; face yellow with a median, club-like, light brown mark that begins in a rounded light brown mark under antennal fossa; face sparsely covered with pale pile; yellow gena reduced and narrow; post-ocular orbit narrow, yellow with dark mark at middle, grayish-white pollinose; occiput dark, white pilose; vertex with black pile; antenna longer than distance between antennal fossa and anterior oral margin; scape elongated, shorter than basoflagellomere, with black pile on dorsal margin; pedicel black, very short, with short black pile on dorso-anterior margin; basoflagellomere very long, laterally flattened, reddish brown, grayish-white pollinose; arista yellow, pubescent, about as long as 1/3 of the length of the basoflagellomere. Thorax ( Figs 1, 4 ). Scutum with three broad, connected, shining black vittae, remaining part yellow, covered predominantly with scattered golden pile and some black pile; postpronotum yellow, bare; notopleuron black; postalar callus glossy yellow, with black pile; scutellum lightbrown dorsally, yellow laterally and ventrally, covered with semi-erect black pile ( Fig. 4 ); pleuron yellow, except dark on anterior part of anepisternum and katepisternum, basal half of meron, metaepisternum and katatergum, and metaepimerom; anepisternum with black and yellow pile on anterior margin; anepimeron with black pile on posterodorsal corner. Legs. Pro- and mesocoxae yellowish with sparse black pile on posterior margin of anterior surface; metacoxa yellow with a median brown mark, with black pile on ventral surface; trochanters yellowish with black pile; pro- and mesofemora yellow with a median brown mark; metafemur yellow on basal 1/3 and shiny black on distal 2/3, except for a small yellow apical portion; all femora covered with long black pile; pro- and mesotibiae yellow; metatibia yellow on basal 1/4, dark on distal 3/4 with an oblique orange cicatrix; all tibiae with long black pile; all tarsi reddish with golden pile, basotarsomere of hind leg with a dorsal brown spot; pro- and mesobasotarsomere broad and short, hind basotarsomere elongated; tarsal claws black. Wing ( Fig. 6 ). Hyaline; covered with microtrichia except on bc and a small region on basal portion of costal cell, on posterobasal 2/3 of cell r (anterior to vein M), on posteroapical 1/3 of bm, on anterobasal half of cell cup and on a small anterior region of cell dm (posterior to vein M); dorsal and ventral calypter brown; halter whitish except for the light brown stem. Abdomen ( Fig. 5 ). Tergum 1 brown with shiny black posterior margin, with short black and golden pile laterally; terga 2, 3 and 4 yellow with a median continuous black vitta, median vitta on tergum 2 with narrow base and broad apex, median vitta in terga 3 and 4 almost linear; terga 2 and 3 with a large lateral black mark reaching posterior margin, tergum 4 with a laterally tongue-shaped black mark beginning medially, extending laterally and ending close to anterior margin and median vittae; terga covered with appressed black pile; tergum 2 with long black pile laterally and with some long golden pile on anterior margin, covered with short black pile on posterior margin; terga 3 and 4 covered with short black pile; sternum 2 rectangular, bare; sternum 3 rectangular with apressed black pile on posterior half; sternum 4 with large base and narrow apex, wholly covered with black pile. Terminalia ( Figs 7–9 ). Epandrium brown, sub-rectangular. Cercus clubbed with long and fine setae on the club. Surstylus very long, with rounded apex, narrower basally than apically. Hypandrium almost triangular-shaped in lateral. Aedeagus elongated, with furcate apex, composed by a short dorsal process and an even shorter ventral process. Ejaculatory apodeme T-shaped. FEMALE. Unknown.

Type material. Holotype m# labelled as follows: “ Brasil Pará Tucuruí/ Rio Tocantins/ Saúde/ 3 a 5.VI.1984 [White label with printed and handwritten information]”; “Armadilha/ 7m / suspensa [= suspended trap at a height of 7 meters] [White label with printed and handwritten information]”. Specimen in good conditions with abdomen detached and glued on a triangle card pinned with their respective specimen. Terminalia were cleared and stored in a plastic vial pinned with the specimen. The type-locality is “Acampamento Saúde” on the Rio Tocantins (state of Pará), 12 km S of municipality of Jacundá (49.4500W; 4.6166S). 29 years ago, the site was artificially flooded by man.

Geographic distribution. Brazil (Pará).

Etymology. This specific epithet is a noun in apposition in honor of Dr. Menno Reemer, who has contributed substantially to our knowledge of the Syrphidae , mainly on Microdontinae .

Remarks. The terminalia of S. reemeri sp. n. differ substantially from S. rolanderi and S. minutula in having a very long surstylus (about twice the length of the cercus) and hypandrium almost triangular. In S. rolanderi and S. minutula the surstylus is not so long (about the same length as the cercus) and the hypandrium is elongated and curved. The basoflagellomere of the new species is very long (as long as scape) whereas in the other two species it is shorter than the scape. In addition, the black setae of the thorax and abdomen of S. reemeri sp. n. are less prominent as in the other species.

The terminalia of S. reemeri sp. n. is similar to that of Schizoceratomyia barretoi Carrera, Lopes & Lane ( Reemer and Ståhls 2013a: fig. 362) considering shape of surstylus, hypandrium and aedeagus. However, in S. reemeri sp. n. the basoflagellomere is not furcate, a characteristic feature of Schizoceratomyia Carrera, Lopes & Lane.

The new species does not fit any known genus of Microdontinae and it is tentatively assigned to Surimyia , because of the bare postpronotum and T-shaped ejaculatory apodeme. In the following, the diagnosis of the genus Surimyia is redefined to include the new species: antenna with basoflagellomere as long as or shorter than scape; postpronotum bare; wing without appendix of vein R4+5 into cell r4+5; abdomen oval, yellow and black; ejaculatory apodeme sclerotized, T-shaped; hypandrium elongated and curved or short and triangular; aedeagus furcate apically.

Figures

FIGURES 1 – 6. Surimyia reemeri sp. n., male (holotype). 1. Habitus, dorsal view. 2. Head, anterior view. 3. Head, lateral view. 4. Scutellum, oblique view. 5. Abdomen, dorsal view. 6. Wing.

FIGURES 7 – 9. Surimyia reemeri sp. n., male (holotype). 7. Cercus, epandrium and surstylus, lateral view. 8. Hypandrium and associated structures, lateral view. 9. Male terminalia parts, dorsal view. Abbreviations: ae = aedeagus, ce = cercus, ea = ejaculatory apodeme, ep = epandrium, hy = hypandrium, su = surstylus.