Sphegina (Asiosphegina) philippina Thompson, 1999

Steenis, Jeroen Van, Hippa, Heikki & Mutin, Valeri A., 2018, Revision of the Oriental species of the genus Sphegina Meigen, 1822 (Diptera: Syrphidae), European Journal of Taxonomy 489, pp. 1-198 : 147-150

Sphegina (Asiosphegina) philippina Thompson, 1999

Figs 67F , 70 D–E, 72D, 74, 77D, 84F–G

Sphegina (Asiosphegina) philippina Thompson, 1999b: 206 . Type locality: Misamis, Philippines (holotype, ♂, BPBM).

Differential diagnosis

Similar to Sphegina (Asiosphegina) amplistylus sp. nov., S. (A.) inflata sp. nov. and S. (A.) spathigera sp. nov. For distinguishing characters, see under S. (A.) amplistylus sp. nov.

Material examined

Holotype

PHILIPPINES • ♂; “ P.I. Misamis or. / Mt. Balatukan , 15 km / SW of Gingoog 1000 / – 2000m 27–30. IV.[19]60”; “ H. Torrevillas / collector”; BPBM.

Paratypes

PHILIPPINES • 1 ♂; “P.I.: Mindanao / Mis. Or. Mt. Pomalihi / 21 km W. Gingoog City / 800–1000 m 30.IV.1965 ”; “ H.M. Torrevillas / Collector / Bishop”; BPBM • 1 ♀; “ Culasi Pannay / PI June 1918 / M. Gregor ”; “USNMENT / QR-code / 01224063”; USNM • 1 ♀; “ Baguio / Benguet / Baker ”; “ C.P. Baker / collection / 1927”; “USNMENT / QR-code / 01224067”; USNM • 1 ♀; same data as for preceding; “21050”; “ Sphegina / orientalis / [det] Sack, Kertesz”; “USNMENT / QR-code / 01224066”; USNM • 1 ♀; “ Mt Makiling / Luzon Baker”; “1486”; “ C.P. Baker / Collection / 1927”; “Type” [red label], “Type No / 52908 / USNM ” [red label], “ Sphegina / philippina / Hull n.sp.”; “ Paratype / Sphegina / philippina / Thompson ” [yellow label], “USNMENT / QR-code / 01224065”; USNM • 1 ♀; “P.I. Negros Or. / L. Balinsasayao / 1–7.X.1959 ”; “ Light Trap / L.W. Quate ”, Paratype / Sphegina / philippina / Thompson ” [yellow label], “ USNM / Exchange / Nov. 2013 ”; “ CNC DIPTERA / # 225407” [white label with blue border]; CNC .

Redescription

Male

LENGTH. Body 6.5–7.7 mm, wing 5.2–5.8 mm.

HEAD. Face in lateral view concave, weakly projected antero-ventrally; frontal prominence very weakly developed. Ratio width of vertex at anterior ocellus: width of head 1: 6.5–6.9; ratio width of ocellar triangle: width of vertex 1: 1.3–1.5; ratio length of ocellar triangle: length of frons 1: 2.3–3.0. Face black, ventral half yellow; light grey pollinose, long pilose along eye-margin. Hypostomal bridge yellow, long pale pilose. Gena and mouth edge yellow, pale pollinose, with large subtriangular non-pollinose shiny area. Frons and vertex black, slightly pollinose, a narrow subtriangular area posterior of lunula nonpollinose and shiny; pile short, light yellow. Frons with weak furrow medially. Occiput black, light grey pollinose, light yellow pilose. Eye with an area of enlarged facets at anterior margin ( Fig. 84G ). Antenna brown with black setae dorsally on scape and pedicel; basoflagellomere rectangular, ratio width: length 1: 1.5–1.6; arista long pilose, nearly 3 times as long as basoflagellomere.

THORAX. Colour black, weakly greyish pollinose, postpronotum dark brown, densely grey pollinose; posterior margin of katepisternum in some specimens narrowly non-pollinose, shiny, otherwise entirely grey pollinose and dull; scutum and pleuron with very short adpressed light yellow pile. Scutellum short and widely sub-triangular, black, weakly pollinose, long pilose, with pile longer than on scutum, without marginal setae, but it is possible the setae are broken off.

WING. Entirely microtrichose; hyaline, stigma yellowish, membrane brown infuscated at junction of veins R 2+3 and R 4+5 and along vein M 1. Crossvein dm-cu meeting vein M slightly oblique and vein M

1

meeting vein R

4+5

perpendicularly.

LEGS. Pro- and mesoleg yellow, tarsomeres 4–5 black, in paratype tarsomere 3 of protarsus light-brown. Metaleg with coxa black, trochanter yellow; femur black with basal ⅓ –3/7 yellow, strongly incrassate, ratio width: length 1: 2.9–3.1; tibia black and yellow biannulate with large rounded apicoventral dens; tarsus entirely black, basitarsomere thick, ratio width: length 1: 3.1–3.3.

ABDOMEN. Length ratio of terga I: II: III: IV 1: 3.0–3.5: 1.3–1.5: 1.3–1.5; ratio width at posterior margin: medial length of tergum II and III 1: 3.9–4.5 and 1: 0.7–0.8. Terga black, anterior ½ of tergum III with dark brown squarish lateral macula; pile pale, on terga short, laterally on terga I and II long; tergum I with horizontal row of 3–4 evenly spread brown-yellow setae at lateral margin; sternum III not sclerotized; sternum IV, Fig. 74A ; sterna VI, VII and VIII simple, with long yellow pile. Genitalia, Fig. 74 B–F: note the strongly asymmetrical surstyli and superior lobes.

Female

Similar to male except for the usual sexual dimorphism.

LENGTH. Body 6.2–6.6 mm, wing 5.2–5.8 mm.

HEAD. Ratio width of vertex at anterior ocellus: width of head 1: 6.2–6.9; ratio width of ocellar triangle: width of vertex 1: 1.4–1.6; ratio length of ocellar triangle: length of frons 1: 3.2–3.7 ( Fig. 84F ). Ventral half of face and anterior ¾ of mouth edge yellow; frons and vertex evenly grey-pollinose, sub-shiny with non–pollinose and shiny semi-circular macula posterior of lunula; basoflagellomere yellow, elongate, ratio width: length 1: 1.4–1.6; arista long pilose; about 3 times as long as basoflagellomere.

THORAX. Postpronotum, post-alar callus and medio-dorsal part of pleuron yellow; Scutellum subrectangular, black, rather long pilose, without marginal setae, probably broken off.

WING. Microtrichose, extreme base of cell bm bare; infuscated at junction of veins R 2+3 and R 4+5 and along veins dm-cu, M

1

. Crossvein dm-cu meeting vein M almost perpendicularly.

LEGS. Protarsus with tarsomeres 4–5 dark brown to black. Metafemur, Fig. 72D , yellow on basal 1: 2.5– 2.7, ratio width: length 1: 2.7–3.1; metatarsus with basitarsomere thick, ratio width: length 1: 2.7–3.0.

ABDOMEN. Length ratio of terga I: II: III: IV: V 1: 3.0–3.7: 1.9–2.4: 1.6–2.1: 1.0–1.2; ratio width at posterior margin: medial length of tergum II and III 1: 1.7–2.0 and 1: 0.5–0.6. Tergum I, Fig. 77D , without stronger setae at lateral margin, with normal pile only. Terga II, III and IV with dark yellow fascia on respectively sub-anterior ⅛, anterior ¼ and anterior ⅓; sternum III short oval, ratio width: length 1: 1.4–1.9; sternum IV rectangular, ratio width: length 1: 0.9–1.2; sternum V rectangular, ratio width: length 1: 0.8–1.0.

Remarks

In addition to Sphegina (Asiosphegina) philippina , the following three new species were found in the type material: S. (A.). amplistylus sp. nov., S. (A.) inflata sp. nov. and S. (A.) spathigera sp. nov. One male paratype (“ Baguio Benguet Baker”, coll Sack (SMF)) was not found in the SMF (pers. comm. Ximo Mengual) nor in any other museum listed in the material and methods section above and its identity remains unclear.

Figures

Fig. 67. Habitus, lateral view. A. Sphegina (Asiosphegina) orientalis Kertész, 1914, Ƌ, Taiwan. B. S. (A.) orientalis, ♀, Taiwan. C. S. (A.) parvula Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. D. S. (A.) bispinosa Brunetti, 1915, Ƌ, India. E. S. (A.) perlobata sp. nov., holotype, Ƌ, Taiwan. F. S. (A.) philippina Thompson, 1999, paratype, ♀ from Culasi, Philippines. Scale bars = 1.0 mm.

Fig. 70. Habitus, dorsal view. A. Sphegina (Asiosphegina) nubicola sp. nov., paratype, ♀, Thailand, dark form. B. S. (A.) nubicola sp. nov., paratype, ♀, Thailand, light form. C. S. (A.) orientalis Kertész, 1914, Ƌ, Taiwan. D. S. (A.) philippina Thompson, 1999, holotype, Ƌ, Philippines. E. S. (A.) philippina, paratype, ♀, Culasi, Philippines. F. S. (A.) plautus sp. nov., paratype, Ƌ, China. Scale bars = 1.0 mm.

Fig. 84. Head, lateral view (E, H), dorsal view (A–D, F, I, K–L) and frontal view (G, J). A. Sphegina (Asiosphegina) nasuta Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. B. S. (A.) nubicola sp. nov., holotype, Ƌ, Thailand. C. S. (A.) orientalis Kertész, 1914, ♀, Taiwan. D. S. (A.) parvula Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. D–E. S. (A.) perlobata sp. nov., holotype, Ƌ, Taiwan. F. S. (A.) philippina, Thompson, 1999, paratype, ♀, Philippines. G. S. (A.) philippina, holotype, Ƌ, Philippines. H. S. (A.) plautus sp. nov., holotype, Ƌ, China. I–J. S. (A.) prolixa sp. nov., holotype, Ƌ, Malaysia. K. S. (A.) cf. spathigera sp. nov., ♀, Philippines. L. S. (A.) taiwanensis sp. nov., paratype, Ƌ, Taiwan. Scale bars = 0.5 mm.

Fig. 74. Sphegina (Asiosphegina) philippina Thompson, 1999, holotype, Ƌ (B–C) and paratype, Ƌ, Mindanao (A, D–F). A. Sternum IV, ventral view. B, E. Left superior lobe, lateral view. C. Right superior lobe with associated parts, lateral view. D. Left surstylus, lateral view. F. Genitalia, right side, lateral view. Scale bars = 0.5 mm.

Fig. 72. Metaleg, anterior view (A–E) and dorsal view (F). A. Sphegina (Asiosphegina) malaisei Hippa, van Steenis & Mutin, 2015, paratype, ♀, Myanmar. B. S. (A.) nigerrima Shiraki, 1930, Ƌ, Taiwan. C. S. (A.) ornata sp. nov., holotype, Ƌ, China. D. S. (A.) philippina, Thompson, 1999, paratype, ♀, Philippines. E. S. (A.) bispinosa Brunetti, 1915, Ƌ, Nepal. F. S. (A.) bispinosa, ♀, India. Scale bars = 0.5 mm.

Fig. 77. Tergum I, dorsal view (A, E–F) and lateral view (B–D). A. Sphegina (Asiosphegina) mirifica Hippa, van Steenis & Mutin, 2015, ♀, Myanmar. B. S. (A.) nigerrima Shiraki, 1930, Ƌ, Taiwan. C. S. (A.) bispinosa Brunetti, 1915, Ƌ, Nepal. D. S. (A.) philippina Thompson, 1999, paratype, ♀, Philippines. E. S. (A.) raduloides Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. F. S. (A.) cf. spathigera sp. nov., ♀, Philippines. Scale bars = 0.5 mm.