identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
1A156AB1C55F508F840731350D0314F5.text	1A156AB1C55F508F840731350D0314F5.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Ubristes mirabilissimus Reemer & Mengual 2026	<div><p>Ubristes mirabilissimus sp. nov.</p><p>Figs 1 A, 2 B, 3 B, 5 –11</p><p>Diagnosis.</p><p>Body length: 12–14 mm (n = 3). Two species of Ubristes with a black abdomen are known: Ubristes flavitibia and U. mirabilissimus sp. nov. These species differ most notably in the length of the abdomen: about as long as or slightly longer than length of head and thorax together in U. flavitibia, approximately 1.5 times as long in U. mirabilissimus sp. nov. In addition, U. mirabilissimus sp. nov. is the only known species of the genus without posterior appendix on vein R 4 + 5. The male genitalia are similar to those of U. flavitibia and U. jaguarinus (the only other species of which the males are known), but differ from U. flavitibia in the more triangular cercus in lateral view (more rounded in U. flavitibia), and from U. jaguarinus in the shape of the surstylus, which is not constricted at the base (constricted in U. jaguarinus).</p><p>Description.</p><p>Male. Body size: 12.5 mm. Head. Face occupying 1 / 2 of head width in frontal view; blackish except for pair of large, triangular, dark yellowish maculae running from antennal fossa to eye margins, gradually widening; white pilose, except black pilose along oral margin. Gena black, black pilose. Oral cavity with lateral margins produced below ventral eye margin. Frons and vertex black; black pilose, except for small patches of golden yellow pile at anterior part of frons and behind ocelli. Occiput black; black pilose dorsally, black and white pilose ventrally. Eye very sparsely and short pilose, with pili about as long as an ommatidium’s diameter, appearing bare under low magnification. Antennal fossa about as wide as high. Antenna brown, scape somewhat paler than postpedicel; antennal ratio approx. 4: 1: 4; postpedicel parallel-sided with narrowly rounded apex, with sensory pit located at 2 / 3 from base. Arista slender, about 3 / 4 of length of postpedicel. Thorax. Postpronotum black; black pilose. Scutum black; black pilose, except for anterolateral patches of golden yellow pile, and V-shaped figure of golden yellow pile posteromedially (only visible in hind view due to orientation of pile). Postalar callus black; black pilose anteriorly, golden yellow pilose posteriorly. Scutellum without calcars; golden yellow pilose, except for a few scattered black pile. Pleuron brownish, except anterior part of anepisternum and katatergum blackish. Anterior and posterior part of anepisternum divided by a weak sulcus; anterior part black pilose, posterior part black pilose along posterior margin. Anepimeron yellow pilose on dorsal half. Katatergum and anatergum long and short black microtrichose, respectively. Katepisternum dorsally long black pilose, ventrally with a few long black pile. Katepimeron bare. Metasternum posteriorly white pilose. Mediotergum shiny black. Calypter grey. Halter with pale brown stem and black knob. Wing. Dark brown in cell c and basal half of cells sc and r 1, pale brown in other parts. Microtrichose, except bare on following parts: basally in cell r 1 along vein Rs, along anterior and posterior margins of cell br, along anterior margin of cell bm, and entirely bare on alula. Legs. Femora and tibiae dark brown, but apices of femora and apical 1 / 3 of tibiae yellowish brown, most notably on metatibia. Femora black pilose. Protibia black pilose, with longest pile somewhat longer than width of tibia. Mesotibia with long erect black pile, with longest pile more than twice as long as width of tibia. Metatibia black pilose, except white pilose dorsally on basal half, and golden yellow pilose dorsally on apical half, with longest pile almost twice as long as maximum width of tibia. Tarsi yellowish brown, paler towards apex; black pilose. Coxae and trochanters brown to blackish; black pilose. Abdomen. Entirely blackish brown. Tergite 1 black pilose laterally, pale pilose submedially. Tergite 2 with pair of large lateral tubercles, with long mixed black and golden yellow pile; other parts of tergite short golden yellow pilose. Tergite 3 short golden yellow pilose, except short black pilose along lateral margins. Tergite 4 short black pilose, except short pale pilose on large posteromedian part. Tergite 1 bare, other tergites long black pilose. Genitalia as in Fig. 11.</p><p>Type material.</p><p>Holotype # m #. Ecuador • Label 1: “ ECUADOR: Napo Prov., Grand // Selva lodge environs, Campo // <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-77.550964&amp;materialsCitation.latitude=-1.107615" title="Search Plazi for locations around (long -77.550964/lat -1.107615)">Cocha Community, loop trail,</a> // 1.107615°S 77.550967°W, // 590 m., 12. Sep. 2023, hand-net // Leg.: X. Mengual ”; label 2: “ ZFMK -DIP 00103449 ” [with QR-Code]; label 3: “ Ubristes spec. nov. // det. M. Reemer 2024 // Specimen code MR 1648 ”; label 4 [red]: “ HOLOTYPE // Ubristes // mirabilissimus Reemer &amp; Mengual ”; coll. INABIO. GB: PX 894625.</p><p>Paratypes. Ecuador • same data as holotype (1 # m #, ZFMK; ZFMK -DIP-00103450, GB: PX 894626); Napo Prov., <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-77.544464&amp;materialsCitation.latitude=-1.098032" title="Search Plazi for locations around (long -77.544464/lat -1.098032)">Grand Selva Lodge, forest trail</a>, 1.098032°S, 77.544467°W, 500 m., 4. Sep. 2024, Leg.: X. Mengual (1 # m #, ZFMK; ZFMK -DIP-00109772, GB: PX 894627) .</p><p>Additionally studied specimens.</p><p>Ecuador • 1 # m #; Napo, Muyuna, near Tena; 11. IV. 1976; alt. 500 m; leg. M. Cooper; coll. NHMUK .</p><p>Etymology.</p><p>The specific epithet is a superlative form of the Latin word mirabilis, an adjective which means ‘ wonderful’ or ‘ strange’. This name was chosen because the authors believe that this is the most wonderful species of Ubristes known so far. Specific epithet to be treated as adjective.</p><p>Habitat and flying behaviour.</p><p>Type material was collected along a trail in lowland, Amazonian rainforest (Figs 15, 16). Individuals were flying very low, close to the ground, with an erratic, zig-zag-like flight. Their flight was not the typical flight of most hoverflies.</p><p>Distribution.</p><p>This species is known from two localities in Napo, a northern province in the Amazon part of Ecuador. The distance between these localities is approximately 35 kilometers.</p><p>DNA barcoding.</p><p>Holotype and paratype males were successfully sequenced, and the three DNA barcodes are identical. These are the first molecular data for the genus Ubristes . A quick comparison with other sequences using BLAST (https://blast.ncbi.nlm.nih.gov/Blast.cgi) showed that the U. mirabilissimus sequences had less than 85 % similarity to other microdontine genera.</p></div>	https://treatment.plazi.org/id/1A156AB1C55F508F840731350D0314F5	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Reemer, Menno;Mengual, Ximo	Reemer, Menno, Mengual, Ximo (2026): Ubristes mirabilissimus sp. nov., a new stingless bee mimicking hoverfly from the Ecuadorian Amazon (Diptera, Syrphidae, Microdontinae). Evolutionary Systematics 10 (1): 47-54, DOI: 10.3897/evolsyst.10.185722
B06E16D5BCDC56178884715B56CE39D4.text	B06E16D5BCDC56178884715B56CE39D4.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Ubristes Walker 1852	<div><p>Ubristes Walker, 1852</p><p>Ubristes Walker, 1852: 217 . Type species: Ubristes flavitibia Walker, 1852: 217, by original designation.</p><p>Differential diagnosis.</p><p>Species of Ubristes have the scutellum without calcars and long, brush-like pilose metatibia and metabasitarsomere, with pile longer than the width of the tibia (Fig. 9). Among the genera with this diagnostic pilosity of the metaleg, Ubristes is the only one in which tergite 2 bears a lateral tubercle on both sides at approximately half its length (Fig. 1). The male genitalia are unique among all Microdontinae because of the presence of well-delimited, oval pits on both sides of the epandrium (Figs 11–13), named fenestrae (Reemer and Ståhls 2013 b).</p><p>In the hitherto described species of Ubristes, the wing vein R 4 + 5 has a posterior appendix (spur or additional vein) into cell r 4 + 5, a character also found in many other microdontine genera. In Ubristes mirabilissimus sp. nov., however, this appendix is absent (Fig. 3). Consequently, our new species would probably run to Hypselosyrphus Hull, 1937 in the keys to the genera in Reemer and Ståhls (2013 a) and Reemer (2014). All Ubristes species differ from Hypselosyrphus, as well as from all other microdontine genera, by the presence of lateral tubercles on tergite 2.</p><p>Distribution and ecology.</p><p>Known localities of all species of Ubristes are indicated on the map of South America in Fig. 14, based on the label information as published by Reemer (2013 a, 2017) and this study. The number of localities per species is very low (two at maximum), so the distribution patterns are undoubtedly very incomplete.</p><p>Reemer (2017) discussed the little amount of available information about the ecology of the other Ubristes species, and it seems that Ubristes species occur in tropical rainforests. Ubristes mirabilissimus sp. nov. is not an exception, as both known localities are located in Ecuadorian parts of the Amazon rainforest.</p></div>	https://treatment.plazi.org/id/B06E16D5BCDC56178884715B56CE39D4	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Reemer, Menno;Mengual, Ximo	Reemer, Menno, Mengual, Ximo (2026): Ubristes mirabilissimus sp. nov., a new stingless bee mimicking hoverfly from the Ecuadorian Amazon (Diptera, Syrphidae, Microdontinae). Evolutionary Systematics 10 (1): 47-54, DOI: 10.3897/evolsyst.10.185722
