A new species of the genus Microtendipes Kieffer, 1915 (Diptera, Chironomidae) from Oriental China

Abstract A new species of the genus Microtendipes Kieffer, 1915, Microtendipes zhejiangensis sp.n., is described, and its morphological description and illustrations are given. A catalogue of the genus in Oriental Region is provided and a key to the males of Microtendipes in the Oriental Region is given.


Introduction
Microtendipes Kieffer, 1915 is a cosmopolitan genus, occurring in all zoogeographical regions. Immature stages of Microtendipes are found in littoral and sublittoral sediments of large water bodies, with a few species occurring in running water (Ashe et al. 1987;Cranston et al. 1989). So far, there are 61 species recorded around the word.
The Oriental Region includes all of Asia south and east of the Himalayan Mountains (India and South East Asia), as well as southern China and the Islands of Southwestern Japan, Indonesia and Philippines. There was no catalogue of Microtendipes for the Oriental Region before this work, some previous records of Oriental Microtendipes are as follows: Kieffer (1921) recorded two new species based on the females, M. stictopterus Kieffer, 1921 from Philippines and M. dimidiatus Kieffer, 1921 from Taiwan Province (China), but Edwards (1929a) reviewed the Chironomidae from Philippines and recorded that the type specimen of M. stictopterus in Kieffer (1921) was too damaged for determination, M. stictopterus has been treated as nomen nudum; Reiss (1997) recorded M. schuecki Reiss, 1997 from Thailand;Chaudhuri et al. (2001) listed M. callicomus (Kieffer, 1911) from the Indian subcontinent, but M. callicomus ought to be treated as Chironomus callicomus; Wang (2000), Qi and Wang (2006) and Qi and Wang (2010) recorded 8 species of Microtendipes from Oriental China; Sasa and Suzuki (2000) recorded M. iriocedeus Sasa & Suzuki, 2000 from Southwestern Japan (Iriomote Island); Kikuchi and Sasa (1990) recorded M. tobaquintus Kikuchi & Sasa, 1990 from Indonesia (Toba Lake).
In this contribution, a new species of Microtendipes from Oriental China is described; the type localities map of the genus Microtendipes in Oriental China is given (Fig. 1); a catalogue and a key to the species of Microtendipes from the Oriental Region are presented.

Materials and methods
The morphological nomenclature follows Saether (1980) and the abbreviations of parts measured follow Qi et al. (2012). The material examined was mounted on slides, following the procedure outlined by Saether (1969 Kieffer, 1915: 70;Pinder 1978: 128;Qi and Wang 2006: 37. Type species. Tendipes abbreviatus Kieffer, 1913[= Chironomus chloris (Meigen, 1818 Diagnosis. Most males of Microtendipes can be distinguished from all other Chironomini by one or two rows of stout, proximally directed setae on the fore femur. Additionally, the hypopygium of some species generally has a tubercle or wart-shaped median volsella often bearing a tuft of long setae. Species without the above characters require association with immature stages for correct placement in the genus; moreover, Microtendipes can be divisible into two species-groups (pedellus group and rydalensis group) with recourse to immature stages. The characters of larva are as follows: the body is large, red to orange coloured, up to 15 mm long; the antenna has 6 segments; the lauterborn organs alternate on apices of segments 2 and 3; the mandible has 3 inner teeth; the median trifid is either pale or as dark as remaining teeth with very small median tooth (maybe absent); the lateral and ventral tubules are absent.
Etymology. The species is named after the type locality, using the Latin suffix -ensis, denoting place of origin.
Remarks The new species is also similar to M. nitidus (Meigen, 1818). The superior volsella of M. nitidus (Meigen) has a basal expansion bearing more than 5 long setae mesally, but the superior volsella of M. zhejiangensis sp.n. is not expanded basally, with 4 long basal setae separated from each other.
This new (1)  Distribution. The species is known from Zhejiang Province of China.