A new species of Sybistroma Meigen, 1824 (Diptera: Dolichopodidae) from China

,I Ya Grichanov

doi:10.25221/fee.418.1

Abstract

A new species Sybistroma genriki sp. n. from the Yunnan province of China is described. It belongs to S. incisa group of species, differing from other species in mostly yellow antenna with arista-like stylus much longer than postpedicel; postpedicel elongated, much longer than wide, acute apically; stylus apical, with dark and white apical swelling; lower postocular setae white; legs mostly yellow except mostly black mid and hind coxae and brown-black distal spot on hind femur. A key to 11 species from Sichuan and Yunnan is provided, based mainly on male secondary sexual characters. The known distribution of the dolichopodine genus Sybistroma Meigen, 1824, is briefly discussed.

Highlights

Until 2005 the genus Sybistroma Meigen, 1824, belonging to the subfamily Dolichopodinae, had long been supposed to be Mediterranean in distribution, with five known species (Negrobov, 1991)
Sybistroma contains more than 50 species described mainly from the Palaearctic and Oriental (China) Regions
Most males of Sybistroma can be distinguished by their modified antenna and hypopygial morphology

Summary

Introduction

Until 2005 the genus Sybistroma Meigen, 1824, belonging to the subfamily Dolichopodinae, had long been supposed to be Mediterranean in distribution, with five known species (Negrobov, 1991). The genus has been recently expanded to include Hypophyllus Haliday, 1832, Ludovicius Rondani, 1843, Nodicornis Rondani, 1843, and some species of Hercostomus Loew, 1857 (Brooks, 2005; Grichanov, 2012). Sybistroma contains more than 50 species described mainly from the Palaearctic and Oriental (China) Regions. Most males of Sybistroma can be distinguished by their modified antenna (reduced pedicel, postpedicel sometimes enlarged, stylus often with one or more lamellae) and hypopygial morphology (tripartite arrangement of basiventral lobes and hypandrium in ventral view). Males lacking modified antennae are distinguished by the possession of elongate setulose apicoventral epandrial lobes of hypopygium (Brooks, 2005). Females of Sybistroma cannot readily be distinguished from those of Hercostomus

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Discussion

Conclusion