Sphegina (Asiosphegina) crinita, Steenis & Hippa & Mutin, 2018

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 : 61-67

Sphegina (Asiosphegina) crinita sp. nov.

urn:lsid:zoobank.org:act:DB64D240-C3C6-4ED5-A157-F125C340CB68

Figs 13D , 19F , 23 C–D, 24, 30A–B, 65A

Differential diagnosis

In the key the species runs to couplet 81 together with Sphegina (Asiosphegina) perlobata sp. nov., even if the species are not particularly similar. In addition to the characters mentioned in the key, S. (A.) crinita sp. nov. is easily distinguished from S. (A.) perlobata sp. nov. by its simple, unlobed posterior margin of sternum IV and its simple surstyli as opposed to having them unusually many-lobed and complex respectively. In the male genitalia, S. (A.) crinita sp. nov. is similar to S. (A.) fimbriata sp. nov., but the superior lobes are very unusual and distinguish the species from it as well as from any other Sphegina . For more discussion, see under the ‘Remarks’ below.

Etymology

The specific epithet is from the Latin ‘ crinita ’, meaning ‘long-haired’ and referring to the long setae on the male superior lobe.

Material examined

Holotype

INDONESIA • ♂; “ Indonesia West Java Gn Halim / un NP, Resort forest Gn Kendeng / Cikaniki , Canopy trail 6°44 ʹ S, 106° E / 32’Alt 900–1000 m 26.XII– 2.i / 2001 S. Kahono, E. Cholik, Sarino / Malaise Trap 2B, GHNP 2001”; LIPI.

Paratypes

INDONESIA • 1 ♂; same data as for holotype; JSA • 1 ♂; “ Indonesia, W-Java, Gunung / Halimun NP, Cikaniki 950 m / 13–20.iii.2001 Rofik , Sarino / 6°44 ′ 91.1 ″ S, 106°32 ′ 25.8 ″ E / Ground Malaise Trap MT 2 B”; ZMFK • 1 ♀; same data as for preceding; LIPI .

MALAYSIA • 1 ♂; “ Perak F.M.S. / Larut Hills / 3700–4500 ft / 13. Feb[ruary] 1932 / H.M. Pendlebury / [written on underside] ex coll / F.M.S. / Museums”; NHM • 1 ♂; “ MALAYSIA: Pahang Distr.: / King George V Nat. Park: / Kuala Tahang / 7–14.XII.1958 ”; “J.L. Gressitt / Collector”; BPBM • 1 ♀; “MALAYA: (W) / Perak, Maxwell / Hill 1350 m. / 17–20.III.1958 ”; “T.C. Maa / Collector / Bishop”; BPBM .

Description

Male

LENGTH. Body 6.4–6.9 mm, wing 4.7–5.5 mm.

HEAD. Face in lateral view, Fig. 30A , concave, very weakly projected antero-ventrally; frontal prominence very weakly developed. Ratio width of vertex at anterior ocellus: width of head 1: 7.5–8.9; ratio width of ocellar triangle: width of vertex 1: 1.1–1.4 (1.7); ratio length of ocellar triangle: length of frons 1: 3.3–3.6 (2.4). Face black, ventral ⅓ to ½ yellow; light grey pollinose, long pilose along eye-margin. Hypostomal bridge black, long pale pilose. Gena yellow to dark yellow and mouth edge dark brown to black with large subtriangular non-pollinose shiny area. Frons and vertex black, predominantly brown pollinose, a subtriangular area posterior of lunula non-pollinose and shiny and two large and medially connected maculae of dense grey pollinosity posterior of shiny part ( Fig. 30B ); pile short, light yellow. Frons with weak but wide medial furrow. Occiput black, light grey pollinose, light yellow pilose. Eye with an area of enlarged facets at anterior margin. Antenna with scape and pedicel dark brown with black setae dorsally; basoflagellomere light-brown to yellow, oval to subrectangular, ratio width: length 1: 1.1–1.3; arista long pilose; about 3 times as long as basoflagellomere.

THORAX. Colour dark brown to black, weakly greyish pollinose, postpronotum light yellow to brownyellow; posterior margin of katepisternum widely non-pollinose, shiny ( Fig. 65A ); scutum and pleuron with very short adpressed light yellow pile. Scutellum subrectangular, black, shiny and only weakly pollinose along posterior margin, with pile longer than on scutum, with two (in Malaysian specimen broken off) widely set medium long setae medially at posterior margin, ratio length of scutellum: length of seta 1: 1.4–1.7.

WING. Microtrichose, bare on baso-medial ¼ of cell and only weakly microtrichose on cell cup; hyaline, stigma brownish. Crossvein dm-cu meeting vein M obliquely and vein M 1 meeting vein R 4+5 perpendicularly.

LEGS. Pro- and mesoleg yellow, tarsomeres 3–5 black. Metaleg with coxa black, trochanter yellow; femur black with basal ⅓ yellow, strongly incrassate, ratio width: length 1: 3.1–3.5; tibia black and yellow biannulate, with long and wide apicoventral dens; tarsus entirely black, basitarsomere thick, ratio width: length 1: 2.9–3.3 (in Malaysian specimen 3.9).

ABDOMEN. Length ratio of terga I: II: III: IV 1: 4.8–5.4: 2.0–2.4: 1.6–2.0; ratio width at posterior margin: medial length of tergum II and III 1: 4.8–5.6 and 1: 0.8–1.1. Terga black, anterior ¼ to ⅓ of tergum III with brown-yellow to yellow fascia; pile pale, on terga short, laterally on terga I and II long; tergum I with an obliquely placed row of 4–5 strong light yellow setae at lateral margin ( Fig. 13D ); tergum IV slightly skewed to the right; sternum III rectangular, ratio width: length 1: 1.8–2.2; sternum IV, Fig. 24A ; sterna VI, VII and VIII simple, with long yellow pile. Genitalia, Fig. 24 B–D: note the simple symmetrical surstyli and asymmetrical superior lobes; see also under the ‘Remarks’ below.

Female

Similar to the male except normal sexual dimorphism.

LENGTH. Body 5.8–6.2 mm, wing 4.0– 4.4 mm.

HEAD. Ratio width of vertex at anterior ocellus: width of head 1: 5.2–5.6; ratio width of ocellar triangle: width of vertex 1: 1.3–1.6; ratio length of ocellar triangle: length of frons 1: 2.3–3.8. Basoflagellomere oval, ratio width: length 1: 1.3–1.4, about 2.5 times as long as basoflagellomere.

THORAX. Scutellum with two widely set, medium long setae medially at posterior margin, ratio length of scutellum: length of seta 1: 1.5.

WING. Entirely microtrichose.

LEGS. Metaleg, Fig. 19F , with femur slightly incrassate, ratio width: length 1: 3.4–3.5, yellow on basal ¼–⅜, basitarsomere thick, ratio width: length 1: 2.9–3.2.

ABDOMEN. Length ratio of terga I: II: III: IV: V 1: 3.8–5.0: 2.2–2.6: 1.8–2.5: 0.9–1.1; ratio width at posterior margin: medial length of tergum II and III 1: 2.0–2.4 and 1: 0.6–0.7. Tergum I black, lateral setae in some specimens undifferentiated from the other pile; tergum II with dark yellow fascia on antero-medial ⅓; tergum III with yellow fascia on anterior 1/6; tergum IV with anterolateral yellow oval macula; tergum and sternum V entirely yellow; sternum III not sclerotized; sternum IV trapezoidal, ratio width: length 1: 0.8–0.9; sternum V rectangular with concave posterior margin, ratio width: length 1: 0.3–0.4.

Remarks

The specimens from Malaysia differ slightly from those from Java in some measurements but the genitalia do not show any differences suggesting that they do not belong to different species. In Sphegina (Asiosphegina) crinita sp. nov. the superior lobes are unusual: the left side one is pushed over the medial line of hypandrium to the right side so that the right side one seems bilobed. Otherwise the genitalia are not much dissimilar to those in S. (A.) fimbriata sp. nov. except for rather minor details.

Figures

Fig. 13. Tergum I, dorsal view (A–C) and lateral view (D–E). A. Sphegina (Asiosphegina) achaeta Hippa, van Steenis & Mutin, 2015, ♀, Myanmar. B. S. (A.) carinata Hippa, van Steenis & Mutin, 2015, paratype, ♀, Myanmar. C. S. (A.) clavigera sp. nov., paratype, ♀, Vietnam. D. S. (A.) crinita sp. nov., paratype, Ƌ, Java. E. S. (A.) crucivena Hippa, van Steenis & Mutin, paratype, Ƌ, Myanmar. Scale bars = 0.5 mm.

Fig. 19. Metaleg, anterior view. A. Sphegina (Sphegina) abbreviata sp. nov., paratype, ♀, Nepal. B. S. (S.) angustata sp. nov., paratype, ♀, Nepal. C. S. (S.) uncinata Hippa, van Steenis & Mutin, 2015, Ƌ, Myanmar. D. Sphegina (Asiosphegina) brevipilis sp. nov., paratype, Ƌ, China, abbreviations: a = length of basitarsus of metatarsus; b = width of basitarsus of metatarsus. E. S. (A.) collicola sp. nov., holotype, Ƌ, Malaysia. F. S. (A.) crinita sp. nov., paratype, ♀, Java, abbreviations: a = length of metafemur; b = width of metafemur. Scale bars = 0.5 mm.

Fig. 23. Habitus, lateral view. A. Sphegina (Asiosphegina) collicola sp. nov., holotype, Ƌ, Malaysia. B. S. (A.) crassispina Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. C. S. (A.) crinita sp. nov., paratype, Ƌ, Java, Indonesia. D. S. (A.) crinita sp. nov., paratype, ♀, Malaysia. E. S. (A.) crucivena Hippa, van Steenis & Mutin, 2015, paratype, ♀, Myanmar. F. S. (A.) culex Hippa, van Steenis & Mutin, 2015, holotype, Ƌ, Myanmar. Scale bars = 1.0 mm.

Fig. 30. Head, lateral view (A, F, H, J), dorsal view (B–D, G, I, K–L) and frontal view (E). A–B. Sphegina (Asiosphegina) crinita sp. nov., paratype, Ƌ, Java, Indonesia. C. S. (A.) crucivena Hippa, van Steenis & Mutin, 2015, paratype, ♀, Myanmar. D–E. S. (A.) culex Hippa, van Steenis & Mutin, 2015, holotype, Ƌ, Myanmar. F–G. S. (A.) dentata, sp. nov., paratype, Ƌ, Taiwan. H–I. S. (A.) distincta sp. nov., paratype, Ƌ, Vietnam. J–K. S. (A.) ensifera Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. L. S. (A.) exilipes sp. nov., holotype, Ƌ, Java, Indonesia. Scale bars = 0.5 mm.

Fig. 65. Pleuron, lateral view. A. Sphegina (Asiosphegina) crinita sp. nov., holotype, Ƌ, Java, Indonesia. B. S. (A.) dentata sp. nov., holotype, Ƌ, Taiwan. C. S. (A.) nigerrima Shiraki, 1930, Ƌ, Taiwan. D. S. (A.) varidissima Shiraki, 1930, Ƌ, Taiwan. Scale bars 0.5 mm.

Fig. 24. Sphegina (Asiosphegina) crinita sp. nov., holotype, Ƌ (B–D), paratype, Ƌ, Malaysia (A). A. Sternum IV, ventral view. B. Left sternum IX and superior lobe, lateral view. C. Left surstylus, lateral view. D. Genitalia, right side, lateral view. Scale bars = 0.5 mm.