<documentID-DOI="http://dx.doi.org/10.3897/zookeys.1046.57052"ID-GBIF-Dataset="348e46a4-8819-4e3c-b4b9-b5e88bee10d7"ID-PMC="PMC8238928"ID-Pensoft-Pub="1313-2970-1046-1"ID-Pensoft-UUID="DBC42C98E4DA5074B86525CF2FB2FA64"ID-PubMed="34239337"ID-ZooBank="66E61C4EFAFE45DE9145DB38199BDEC3"ModsDocID="1313-2970-1046-1"checkinTime="1624307367557"checkinUser="pensoft"docAuthor="Jordaens, Kurt, Goergen, Georg, Skevington, Jeffrey H., Kelso, Scott & Meyer, Marc De"docDate="2021"docId="E0399246B03058489FF01EE8B740D122"docLanguage="en"docName="ZooKeys 1046: 1-141"docOrigin="ZooKeys 1046"docPubDate="2021-06-21"docSource="http://dx.doi.org/10.3897/zookeys.1046.57052"docTitle="Mesembrius arcuatus Jordaens, Goergen & De Meyer 2021, sp. nov."docType="treatment"docUuid="BBA3D30D-32BC-463D-A4E3-0F515798965E"docUuidSource="ZooBank"docVersion="5"id="DBC42C98E4DA5074B86525CF2FB2FA64"lastPageNumber="1"masterDocId="DBC42C98E4DA5074B86525CF2FB2FA64"masterDocTitle="Revision of the Afrotropical species of the hover fly genus Mesembrius Rondani (Diptera, Syrphidae) using morphological and molecular data"masterLastPageNumber="141"masterPageNumber="1"pageNumber="1"updateTime="1732487030840"updateUser="ExternalLinkService">
<mods:titleid="CB608F6D958D81162D51ADCDEB61BA9B">Revision of the Afrotropical species of the hover fly genus Mesembrius Rondani (Diptera, Syrphidae) using morphological and molecular data</mods:title>
<mods:affiliationid="AA4F4C79937B87B110E8AFF688E39D6A">Royal Museum for Central Africa, Invertebrates Section and JEMU, Leuvensesteenweg 13, B- 3080 Tervuren, Belgium</mods:affiliation>
<mods:affiliationid="0CEF90AC04E0C6BB5C49719B4B11090E">International Institute for Tropical Agriculture (IITA), Biodiversity Centre, 08 BP 0932 Tri Postal, Cotonou, Benin</mods:affiliation>
<mods:affiliationid="91992F545B87F8AC1DD34161A6BEDD06">Canadian National Collection of Insects, Arachnids and Nematodes, Agriculture and Agri-Food Canada, K. W. Neatby Building, 960 Carling Avenue, Ottawa, ON K 1 A 0 C 6, Canada</mods:affiliation>
<mods:affiliationid="D06099461F3926750174F7D2517F1551">Canadian National Collection of Insects, Arachnids and Nematodes, Agriculture and Agri-Food Canada, K. W. Neatby Building, 960 Carling Avenue, Ottawa, ON K 1 A 0 C 6, Canada</mods:affiliation>
<mods:affiliationid="CF1538CBFF234FD27307E5B89854620F">Royal Museum for Central Africa, Invertebrates Section and JEMU, Leuvensesteenweg 13, B- 3080 Tervuren, Belgium</mods:affiliation>
<taxonomicNameid="5E5B028E9ED30EF78256A26D5B5040F3"ID-CoL="9HXSG"LSID="http://zoobank.org/BBA3D30D-32BC-463D-A4E3-0F515798965E"authority="Jordaens, Goergen & De Meyer"authorityName="Jordaens, Goergen & De Meyer"authorityYear="2021"class="Insecta"family="Syrphidae"genus="Mesembrius"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Mesembrius arcuatus"order="Diptera"pageId="0"pageNumber="1"phylum="Arthropoda"rank="species"species="arcuatus"status="sp. nov.">Mesembrius arcuatus Jordaens, Goergen & De Meyer</taxonomicName>
<figureCitationid="313E56742FD402FEEF7049ED5D222B69"captionStart="Figures 46–51"captionStartId="F24"captionText="Figures 46 - 51. Mesembrius spp., head, frontal view 46 M. arcuatus sp. nov. (♂) 47 M. caffer (Loew) (nominal morph) (♂) 48 M. caffer (Loew) (spined morph) (♂) 49 M. ctenifer Hull syn. nov. (♂) 50 M. capensis (Macquart) (♂) 51 M. chapini Curran (♂)."figureDoi="10.3897/zookeys.1046.57052.figures46-51"httpUri="https://binary.pensoft.net/fig/557485"pageId="0"pageNumber="1">, 46</figureCitation>
<figureCitationid="15DF39E443D66F063F75D334273BECBC"captionStart="Figures 83–88"captionStartId="F31"captionText="Figures 83 - 88. Mesembrius spp., abdomen, dorsal view 83 M. arcuatus sp. nov. (♂) 84 M. caffer (Loew) (nominal morph) (♂) 85 M. caffer (Loew) (spined morph) (♂) 86 M. ctenifer Hull syn. nov. (♂) 87 M. capensis (Macquart) (♂) 88 M. chapini Curran (♂)."figureDoi="10.3897/zookeys.1046.57052.figures83-88"httpUri="https://binary.pensoft.net/fig/557492"pageId="0"pageNumber="1">, 83</figureCitation>
<figureCitationid="E707207102242BDAB007C59A125FC898"captionStart="Figures 127–130"captionStartId="F39"captionText="Figures 127 - 130. Mesembrius spp., right wing 127 M. arcuatus sp. nov. (♂) 128 M. caffer (Loew) (nominal morph) (♂) 129 M. capensis (Macquart) (♂) 130 M. chapini Curran (♂)."figureDoi="10.3897/zookeys.1046.57052.figures127-130"httpUri="https://binary.pensoft.net/fig/557500"pageId="0"pageNumber="1">, 127</figureCitation>
<figureCitationid="48A8B5D2E5A5D703092838D43FE6A118"captionStart="Figures 155–158"captionStartId="F46"captionText="Figures 155 - 158. Mesembrius, proleg, dorsal view 155 M. sulcus sp. nov. (♂) 156 M. tibialis sp. nov. (♂) 157 M. arcuatus sp. nov. (♂) 158 M. ingratus (Loew) (♂). Abbreviations: bt-basitarsus, fem-femur, tib-tibia."figureDoi="10.3897/zookeys.1046.57052.figures155-158"pageId="0"pageNumber="1">, 157</figureCitation>
<figureCitationid="34D4E21CFC8F6AEC09DD007CE05764EF"captionStart="Figures 189–192"captionStartId="F54"captionText="Figures 189 - 192. Mesembrius spp., metaleg, posterior view 189 M. tarsatus (Bigot) (♂) 190 M. ingratus (Loew) (♂) 191 M. arcuatus sp. nov. (♂) 192 M. nigriceps Curran (♂). Abbreviations: bt-basitarsus, fem-femur, tib-tibia."figureDoi="10.3897/zookeys.1046.57052.figures189-192"httpUri="https://binary.pensoft.net/fig/557514"pageId="0"pageNumber="1">, 191</figureCitation>
<figureCitationid="F38144110F70E37CB0946ED3295AC3CA"captionStart="Figures 205–216"captionStartId="F58"captionText="Figures 205 - 216. Mesembrius spp., male genitalia, lateral view 205 M. arcuatus sp. nov. 206 M. caffer (Loew) (nominal morph) 207 M. caffer (Loew) (spined morph) 208 M. ctenifer Hull syn. nov. 209 M. capensis (Macquart) 210 M. chapini Curran 211 M. copelandi sp. nov. 212 M. cyanipennis (Bezzi) 213 M. ingratus (Loew) 214 M. longipilosus sp. nov. 215 M. madagascariensis Keiser 216 M. minor (Bezzi)."figureDoi="10.3897/zookeys.1046.57052.figures205-216"httpUri="https://binary.pensoft.net/fig/557518"pageId="0"pageNumber="1">, 205</figureCitation>
<taxonomicNameid="ACB127059A912EE2ABBF70AE2F0C2F16"authorityName="Jordaens, Goergen & De Meyer"authorityYear="2021"class="Insecta"family="Syrphidae"genus="Mesembrius"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Mesembrius arcuatus"order="Diptera"pageId="0"pageNumber="1"phylum="Arthropoda"rank="species"species="arcuatus">
sp. nov. is holoptic, has a profemur with a loose, black apical pile brush and a strongly curved metatibia which is dorsoventrally compressed in the middle third. It can be distinguished from any other species by the apical pile brush of the profemur which is loose and black dorsally and yellow ventrally (yellowish with some black pile interspersed in
<taxonomicNameid="76DE5962D8B0AAC61B53133455A3527B"authorityName="Jordaens, Goergen & De Meyer"authorityYear="2021"class="Insecta"family="Syrphidae"genus="Mesembrius"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Mesembrius arcuatus"order="Diptera"pageId="0"pageNumber="1"phylum="Arthropoda"rank="species"species="arcuatus">
<materialsCitationid="D0CAF9F8AFE64E1460604B11033280BD"collectingDate="2021-01-01"collectingDateMax="2021-12-31"collectingDateMin="2021-01-01"collectorName="C. C. Gowdey., Det. K. Jordaens"country="Uganda"determinerName="Det. K. Jordaens"location="Entebbe"specimenCount="1"typeStatus="Holotype">
<taxonomicNameid="AA957C0752B1344FC1D38211D2ABE4B0"authorityName="Jordaens, Goergen & De Meyer"authorityYear="2021"class="Insecta"family="Syrphidae"genus="Mesembrius"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Mesembrius arcuatus"order="Diptera"pageId="0"pageNumber="1"phylum="Arthropoda"rank="species"species="arcuatus">Mesembrius arcuatus</taxonomicName>
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<materialsCitationid="B977503EDFB5FCEECDC34AD78D52BA2C"collectingDate="1911-08-14"collectorName="C. C. Gowdey"country="Uganda"location="Entebbe"specimenCount="1"specimenCount-male="1"typeStatus="paratype">
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<materialsCitationid="59F15FC28A949AF79B335A1A59F36373"collectingDate="1911-08-17"collectorName="C. C. Gowdey"country="Uganda"location="Entebbe"specimenCount="1"specimenCount-male="1"typeStatus="paratype">
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<materialsCitationid="8F29D11B22BC3B05C19E31F95F3F159C"collectingDate="1912-12-03"collectingDateMax="1912-12-04"collectingDateMin="1912-12-03"collectorName="C. C. Gowdey"country="Uganda"location="Entebbe"specimenCount="1"specimenCount-male="1"typeStatus="paratype">
<materialsCitationid="77FDEEFEC2A9BF4CA075B3982C5AB841"collectingDate="1912-11-13"collectorName="C. C. Gowdey"country="Uganda"location="Entebbe"specimenCount="1"specimenCount-male="1"typeStatus="paratype">
<materialsCitationid="A8C7156412FCA0E85B00B01E5BAC2058"collectingDate="1912-10-16"collectorName="C. C. Gowdey"country="Uganda"location="Entebbe"specimenCount="2"specimenCount-male="2"typeStatus="paratype">
<materialsCitationid="DC05B45D3E2368DC8ECCC022164236AA"collectingDate="1911-09-01"collectingDateMax="1911-09-11"collectingDateMin="1911-09-01"collectorName="S. A. Neave"country="Uganda"location="Entebbe"specimenCount="5"specimenCount-male="5"typeStatus="paratype">
<materialsCitationid="7ABA53B151FB32C64F866E6A44AAD603"collectingDate="2021-01-01"collectingDateMax="2021-12-31"collectingDateMin="2021-01-01"collectorName="A. Hodges"country="Uganda"location="Side of Lake Albert"specimenCount="1"specimenCount-male="1"typeStatus="paratype">
<locationid="BC6235767A4BD2FBA34B9A065FC3E84C"LSID="urn:lsid:plazi:treatment:E0399246B03058489FF01EE8B740D122:BC6235767A4BD2FBA34B9A065FC3E84C"country="Uganda"name="Side of Lake Albert">Side of Lake Albert</location>
). Eyes bare; holoptic, length of eye contiguity equal to approx. the length of ocellar triangle. Face dark with dark medial vitta; white pilose; white pollinose. Vertical triangle black pilose; white pollinose in dorsal half. Ocellar triangle dark; black pilose; white pollinose; distance between lateral ocellus and eye margin 1/2 width of ocellus. Occiput yellow; white pilose; yellow and white pollinose. Frontal triangle orange-brown; white pilose. Frontal prominence shiny black; black pilose. Antenna dark brown to black; postpedicel white pollinose; antennal arista reddish-brown.
Scutum black with a pair of dorsal, well-demarcated grey pollinose vittae; yellow and black pilose. Scutellum uniformly light yellow-brown; yellow pilose throughout, black pilose on posterior 2/3.
): Femur dark brown to black; with a loose, apical pile brush which is black pilose dorsally, yellow pilose ventrally; with long, yellow pile posterodorsally and with shorter, black pile anterodorsally and anteroventrally. Tibia with long, black pile, except dorsally. Basitarsus orange-brown; with long, black pile posteriorly. Other tarsi orange-brown; yellow and black pilose dorsally; orange pilose ventrally. Mesoleg: Dark brown to black, except for tarsi which are reddish-brown; black pilose dorsally, orange pilose ventrally. Metaleg (Fig.
): Femur dark brown to black; very slender; covered with long, thin yellow pile, except on ventral side which is almost bare; with shorter, black pile on posteroventral proximal 2/3; with a series of thick, black setulae at distal 1/3; with thick, black pile at distal end. Tibia curved; strongly dorsoventrally compressed in middle 1/3; with long, yellow and black pile, except in the flattened posterior section. Tarsi yellow and black pilose, except ventrally where orange pilose.
). Tergite II with a pair of very large, yellow triangular to rounded maculae; yellow pilose; black markings hourglass-shaped; posterior black marking equal in size or somewhat narrower than anterior black marking, with a medial white pollinose area; posterior black marking with black pile that posterolaterally extends into the yellow maculae. Tergite III with yellow-orange fascia and a large, black and strongly white pollinose triangular marking; pile short, stiff and black, except on the lateral sides where it is longer, thinner and yellow. Tergite IV strongly white pollinose anteriorly, with a large posterior, rounded, white pollinose black marking; pile short, thick and black, except on the lateral sides where it is longer, thinner and yellow.
<figureCitationid="97FA5F6AFC6915FCB50B0BD01731D281"captionStart="Figures 205–216"captionStartId="F58"captionText="Figures 205 - 216. Mesembrius spp., male genitalia, lateral view 205 M. arcuatus sp. nov. 206 M. caffer (Loew) (nominal morph) 207 M. caffer (Loew) (spined morph) 208 M. ctenifer Hull syn. nov. 209 M. capensis (Macquart) 210 M. chapini Curran 211 M. copelandi sp. nov. 212 M. cyanipennis (Bezzi) 213 M. ingratus (Loew) 214 M. longipilosus sp. nov. 215 M. madagascariensis Keiser 216 M. minor (Bezzi)."figureDoi="10.3897/zookeys.1046.57052.figures205-216"httpUri="https://binary.pensoft.net/fig/557518"pageId="0"pageNumber="1">205</figureCitation>
). Epandrium: Dorsal lobe of surstylus short and stout, with a very long, sharp expansion on distal end; short black spinose on apex and long brown pilose on dorsal surface. Ventral lobe of surstylus strongly convex; bare.
<paragraphid="F2EAD199DFAA2DA67D8DB65C011FAC89"pageId="0"pageNumber="1">This is a new species to the Afrotropical Region and only collected from Uganda. The female remains unknown, despite the fact that 28 males were collected or encountered in various collections.</paragraph>
<taxonomicNameid="DAB7D21F0567D8FEF0AE3AD1E1B7CEE5"authorityName="Jordaens, Goergen & De Meyer"authorityYear="2021"class="Insecta"family="Syrphidae"genus="Mesembrius"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Mesembrius arcuatus"order="Diptera"pageId="0"pageNumber="1"phylum="Arthropoda"rank="species"species="arcuatus">
(Latin) means bent like a bow and was chosen with reference to the strongly curved metatibia. It is to be treated as an adjective (nominative singular masculine).
