Anasimyia matutina Locke, Skevington and Vockeroth

Skevington, Jeffrey H., Young, Andrew D., Locke, Michelle M. & Moran, Kevin M., 2019, New Syrphidae (Diptera) of North-eastern North America, Biodiversity Data Journal 7, pp. 36673-36673 : 36673

Anasimyia matutina Locke, Skevington and Vockeroth sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: CNC_Diptera91232 ; recordedBy: N. Banks; individualCount: 1; sex: male; lifeStage: adult; Taxon: scientificName: Anasimyiamatutina Locke, Skevington and Vockeroth; kingdom: Animalia; phylum: Arthropoda; class: Hexapoda; order: Diptera; family: Syrphidae; genus: Anasimyia; specificEpithet: matutina; taxonRank: species; scientificNameAuthorship: Locke, Skevington and Vockeroth; vernacularName: Small-spotted Swamp Fly; nomenclaturalStatus: new species; Location: country: U.S.A.; stateProvince: Virginia; locality: Great Falls ; decimalLatitude: 39; decimalLongitude: -77.283333; Identification: identifiedBy: J.R. Vockeroth; Event: samplingProtocol: hand collected; eventDate: 06/16/1952; year: 1952; month: 6; day: 16; verbatimEventDate: 16.vi.1952; Record Level: language: en; institutionCode: CNC; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: catalogNumber: CNC_Diptera91233 ; individualCount: 1; sex: male; lifeStage: adult; Taxon: scientificName: Anasimyiamatutina Locke, Skevington and Vockeroth; kingdom: Animalia; phylum: Arthropoda; class: Hexapoda; order: Diptera; family: Syrphidae; genus: Anasimyia; specificEpithet: matutina; taxonRank: species; scientificNameAuthorship: Locke, Skevington and Vockeroth; vernacularName: Small-spotted Swamp Fly; nomenclaturalStatus: new species; Location: country: U.S.A.; stateProvince: Virginia; locality: Petersburg, Chesterford County ; decimalLatitude: 37.227858; decimalLongitude: -77.40195; Identification: identifiedBy: J.R. Vockeroth; Event: samplingProtocol: hand collected; eventDate: 06/01/1917; year: 1917; month: 6; day: 1; verbatimEventDate: 1.vi.1917; Record Level: language: en; institutionCode: CNC; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: catalogNumber: CNC_Diptera91234 ; recordedBy: Fred K. Knab; individualCount: 1; sex: male; lifeStage: adult; Taxon: scientificName: Anasimyiamatutina Locke, Skevington and Vockeroth; kingdom: Animalia; phylum: Arthropoda; class: Hexapoda; order: Diptera; family: Syrphidae; genus: Anasimyia; specificEpithet: matutina; taxonRank: species; scientificNameAuthorship: Locke, Skevington and Vockeroth; vernacularName: Small-spotted Swamp Fly; nomenclaturalStatus: new species; Location: country: U.S.A.; stateProvince: Washington, D.C.; locality: Washington ; decimalLatitude: 38.9; decimalLongitude: -77.033333; Identification: identifiedBy: J.R. Vockeroth; Event: samplingProtocol: hand collected; eventDate: 05/17/1912; year: 1912; month: 5; day: 17; verbatimEventDate: 17.v.1912; Record Level: language: en; institutionCode: CNC; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: catalogNumber: Jeff_Skevington_Specimen17432 ; recordedBy: N. Banks; individualCount: 1; sex: male; lifeStage: adult; Taxon: scientificName: Anasimyiamatutina Locke, Skevington and Vockeroth; kingdom: Animalia; phylum: Arthropoda; class: Hexapoda; order: Diptera; family: Syrphidae; genus: Anasimyia; specificEpithet: matutina; taxonRank: species; scientificNameAuthorship: Locke, Skevington and Vockeroth; vernacularName: Small-spotted Swamp Fly; nomenclaturalStatus: new species; Location: country: U.S.A.; stateProvince: Virginia; locality: Chain Bridge ; decimalLatitude: 38.929911; decimalLongitude: -77.114411; Identification: identifiedBy: J.R. Vockeroth; Event: samplingProtocol: hand collected; eventDate: 06-14; month: 6; day: 14; verbatimEventDate: 14.vi; Record Level: language: en; institutionCode: CNC; basisOfRecord: PreservedSpecimen

Description

Size: Body length 9.8 to 10.2 mm; wing length 6.1 to 6.4 mm

Male: Head: Face yellow, covered in yellow pollen and fine yellow pile, sides of face black, shining and bare, small medial tubercle, lower face projecting forwards along the oral margin; gena black, covered in yellow pollen and fine yellow pile; frons black dorsally, yellow ventrally, dense yellow pollen often obscures ground colour, narrow shining spot dorsal to the antennal socket, yellow pilose; vertex black, mostly black pilose with some yellow pile; antenna wholly yellow to orange, scape and pedicel with short, black pile, pedicel slightly longer than scape, postpedicel round; eye bare.

Thorax: Scutum dull black with two medial, yellow pollinose stripes that are more than ½ as wide as adjacent black area, lateral edges yellow pollinose from postpronotum to postalar callus, yellow pilose; postpronotum black, covered in yellow pollen and yellow pile; postalar callus black, covered in yellow pollen and yellow pile; scutellum black on basal ½, yellow on apical ½, yellow pilose; pleuron black, covered in yellow pollen, anterior anepisternum, katepimeron and meron bare, posterior anepisternum, katepisternum and anepimeron yellow pilose; metasternum black, yellow pollinose, yellow pilose; procoxa black, yellow pollinose, yellow pilose; protrochanter black, yellow pollinose, yellow pilose with a few black setulae apically; profemur black on basal ½ -⅔, yellow on apical ⅓- ½, yellow pollinose, yellow pilose, anteroventral basal patch of black setulae with cuticle shining below; protibia yellow, yellow pilose; protarsus yellow, yellow pilose, apical two tarsomeres sometimes darkened brown; mesocoxa black, yellow pollinose, yellow pilose, few black setulae apically; mesotrochanter black, yellow pollinose, yellow pilose, few black setulae apically; mesofemur black on basal ½, yellow on apical ½, yellow pollinose, yellow pilose, anteroventral basal patch of black setulae; mesotibia yellow, yellow pilose with few black setulae ventrally on apical end; mesotarsus yellow, yellow pilose with black setulae ventrally, apical one or two tarsomeres sometimes slightly darkened brown; metacoxa black, yellow pollinose, yellow pilose anteriorly; metatrochanter black, yellow pilose with small ventral tubercle; metafemur enlarged, black basal ⅔, yellow apical ⅓ with apex narrowly black, yellow pilose, black setulae ventrally on apical ⅔; metatibia light brown, sometimes yellow, on basal ⅓, yellow on medial ⅓, dark brown (darker than base) on apical ⅓ (sometimes>⅓), yellow pilose, with ventral carinate ridge ending in long apical spur, spur ¼ -⅓ as long as basotarsomere; metatarsus brown, black pilose anteriorly, yellow pilose posteriorly; wing entirely densely microtrichose; halter yellow; calypter yellow.

Abdomen: Tergite 1 black, small yellow spots on lateral edges, covered in yellow to grey pollen, yellow pilose; tergite 2 elongate, longer than wide and longer than tergite 3, slightly narrowing posteriorly, yellow laterally, black medially forming a ‘v’ shape that is widest anteriorly, narrowest medially, posterior ¼ brown to black, pair of faint yellow pollinose markings on yellow cuticle that extend from anterolateral edge and curve inwards medially, yellow pilose, posterior edge shining; tergite 3 brown to reddish to black, sometimes more yellow to orange, usually not uniform in colour and without a distinct pattern, anterolateral corners yellow with yellow pollen, yellow pilose, posterior edge shining; tergite 4 similar to tergite 3 but usually with anterior medial pair of small pollinose spots, faint pollinose spot between dull anterior portion and shining posterior margin; sternite 1 black, yellow to grey pollinose, yellow pilose; sternite 2 yellow anteriorly, black posteriorly, black extends to or almost to anterior edge in a narrow, medial point; sternite 3 brown to black anteriorly, yellow to brown posteriorly, amount varies from ¼ black to almost entirely black; sternite 4 yellow to brown; sternites 2-4 covered in yellow to grey pollen, pollen is more dense, often forming bands, along the posterior edge, yellow pilose.

Genitalia: Epandrium subquadrate, longer than wide, narrows slightly dorsally; cercus with laterally compressed, subquadrate sclerotised outer portion covered in long pile and membranous inner portion; surstylus long, bent at a 90° angle, with setae on ventral inner surface, apical end triangular, curved inwards, covered in setae on dorsal and ventral edges; basal hypandrium with central, basoventral pointed process, directed apically, narrows medially, deeply concave ventrally, with several posteroventral-facing curved setae at apicoventral end (one pair of setae longer than other setae); apical hypandrium split into two complex, multi-lobed arms; phallapodeme long, rod-like, laterally compressed and curved dorsally at base; phallus situated between the multi-lobed hypandrial arms, small and difficult to distinguish, with separate small, dorsal conical structure, pointed at apex (possibly secondarily derived from surrounding membrane).

Female: Unknown.

See Fig. 3 & Fig. 4.

Diagnosis

Male metatrochanter with modest tubercle and long, acute apical metatibial spur ( Fig. 3 d).

Etymology

The word matutina is Latin, meaning of the morning, early. This is the name given to this species by J.R. Vockeroth.

Distribution

Only four specimens are known from Virginia (Chain Bridge, Great Falls and Petersburg) and Washington DC.

Ecology

Rarely found, therefore nothing is known about its habitat association. It is known to fly from mid-May to mid-June.

Taxon discussion

Size and shape of spur on metatrochanter and of metatibial spur separate this from other Anasimyia Group 2 males (see Skevington et al. 2019). Females are unknown, but are likely to be identifiable as Anasimyia Group 2 females ( Skevington et al. 2019).

Common Name

The common name given to the species by Skevington et al. (2019) is Small-spotted Swamp Fly.