Chersodromia leleji Maeda, 2011, sp. nov.
Creators: name: Maeda, Takuya
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Hybotidae
Chersodromia
Chersodromia leleji

description: Chersodromia leleji sp. nov.
(Figs. 7, 14, 27–33)
Diagnosis. A small, brownish species measuring less than 1.5 mm. Stylus long. Face wider than frons. Katepisternum largely polished. Wings normally developed. Male terminalia: right surstylus reduced to small, pointed projection; right epandrial lamella with setulae along dorsoapical margin; right cercus very small; left surstylus with large, flattened, round outermost lobe. Setae on head and thorax black. Vertical setae (2 pairs) present.
Description. Male (Fig. 7). Body length 1.10–1.27 mm; head width 0.29–0.32 mm; wing length 1.44–1.70 mm. Head (Fig. 27) dark brown in ground-colour and greyish pollinose; palpus brown in ground-colour and greyish pollinose; proboscis brown, slightly shining; antenna brown; all setae and setulae on head black. Frons moderate in width; in frontal view face below antennal sockets wider than frons. Ocellar setae (2 pairs) moderate in length, as long as scape, pedicel and postpedicel combined. Vertical setae (2 pairs) longer than ocellar setae. In frontal view gena moderate in width, 1/5.5 as wide as maximum eye height. Occiput with setulae. Antenna (Fig. 28): postpedicel round and slightly lower than pedicel in lateral view, with setulae along anterior margin; extension of postpedicel present dorsoapically; stylus long, ca. 2.5 times as long as pedicel and postpedicel combined. Palpus with long setulae; sensory pit obscure even with preparation on slide.
Thorax (Fig. 29) dark brown in ground-colour and greyish pollinose; katepisternum largely polished; all setae and setulae on thorax black. Vestiture on thorax: 1 long setula on each proepisternum; 1 pair of long, inflected postpronotal setae; 1 pair of posthumeral setae (sometimes absent); 3–4 pairs of notopleural setae (2 pairs long); 1 pair of supra-alar setae; 1 pair of long, inflected postalar setae; 3–4 pairs of dorsocentral setae near median line (1 long pair near scutellum); some dorsocentral setulae in multiple rows; 1 pair of incomplete rows of acrostichal setulae; 1 pair of long, inflected apically scutellar setae; 1 pair of subapical scutellar setulae.
Wing (Fig. 14) normally developed, clear, with pale brown veins. Basicosta with 1 black seta and some setulae; costa with many dark brown setulae along anterior margin, ending at connection with vein M1+2; subcosta absent; R1 meeting costa at midway of wing; radial sector moderate in length; CuA1 indistinctly connected to wing margin; anal vein reduced to pale, fold-like line. Calypter pale brown, minute. Halter pale brown, large.
Legs pale brown, stout. All setae on legs black; setulae on legs brown to pale brown. Fore femur sparsely covered with setulae (setulae of anteroventral and posteroventral rows long; some preapical setulae strong; 2 subbasal setulae long), with 1 anterior preapical seta, 1 posterior preapical seta and 1 anteroventral preapical seta. Fore tibia somewhat swollen in dorsal view, covered with setulae (especially dense on anterior surface), with 1 anteroventral preapical seta, 1 posteroventral preapical seta and 1 strong anterior setula in basal part. Fore tibial gland indistinct. Mid femur sparsely covered with setulae, with anteroventral row of ca. 10 setae, 1 anteroventral preapical seta, 1 anterior preapical seta, posteroventral row of ca. 10 setae, 1 posteroventral preapical seta and 1 posterior preapical seta. Mid tibia covered with setulae, with anteroventral row of 15–20 small, black spinulae (preapical one long), 1 anterior preapical seta and 1 posteroventral preapical seta. Hind femur covered with setulae (some posterior preapical setulae strong), with anteroventral row of ca. 10 setae, 1 anterior preapical seta and 1 posteroventral preapical seta. Hind tibia covered with setulae (especially dense in apical part of posteroventral surface), with 2 anteroventral setae, 1 anterior seta, 1 anterior preapical seta, anterodorsal row of 3 setae and 1 dorsal seta. Fore, mid and hind tarsomeres covered with setulae.
Preabdomen sparsely covered with pale brown setulae; tergites and sternites brown/dark brown in groundcolour and sparsely greyish pollinose. Tergite 7 with some long setae along posterior margin. Eighth segment hidden, with some setae along posterior margin.
Terminalia (Figs. 30–33). Coloration: right surstylus (inner surface polished brown), right epandrial lamella and cerci dark brown in ground-colour and sparsely greyish pollinose; left surstylus, left epandrial lamella and hypandrium shiny pale brown. Right surstylus reduced to small, pointed projection (Fig. 30), with boundary line between it and right epandrial lamella obscure. Right epandrial lamella with short, black setae (Fig. 30) and whitish microtrichia over surface, with many small setulae in dorsoapical part, which forms weakly differentiated marginal zone (Figs. 30, 32). Left surstylus composed of several lobes; outermost lobe large, flattened and round (Fig. 31). Left cercus somewhat slender, with some setulae; right cercus very small, with some small setulae (Fig. 33).
Female. Unknown.
Type material. HOLOTYPE 3, labelled: Russian Far East, S. Primorye, Gamov Pen., Vityaz’ Bay, 24.viii.2010, leg. T. Maeda (IBSS). Paratypes (dried specimens): 13 3, same data as holotype; 7 3, same loc., 23.viii.2010. Other specimens examined (in alc.): 7 3, Amur Bay, 3–5 km E. Tavrichanka, 22.viii.2010; 2 3, Zarubino, 25.viii.2010; 38 3, Pos’et, 25.viii.2010; 4 3, Andreevka, Risovaya Bay, 23.viii.2010; 4 3, Gamov Pen., Astaf’ev Bay (bare sands), 26.viii.2010; 10 3, Gamov Pen., Vityaz’ Bay, 23.viii.2010; 44 3, Gamov Pen., Telyakovskiy Bay, 24.viii.2010; 19 3, Nazimov Cape, 28.viii.2010.
Type depository. Two paratypes are deposited in IBSS; some paratypes are in FMNH, NIAES, USNM, OUMNH and TMC.
Etymology. The specific epithet is dedicated to the hymenopterist, Dr. Arkady S. Lelej, of the Institute of Biology and Soil Science, Far Eastern Branch of Russian Academy of Science, Vladivostok, Russia.
Distribution. Russian Far East: southern part of Primorsk Territory.
Remarks. This species was collected on different seashore types in the southern part of Primorsk Territory. Chersodromia leleji closely resembles C. gamoviensis and is distinguished from the latter only in the structure of the male terminalia.
description: Published as part of Maeda, Takuya, 2011, New species of Chersodromia from the Russian Far East (Diptera: Empidoidea: Hybotidae: Tachydromiinae), pp. 1-24 in Zootaxa 2979 on pages 8-11, DOI: 10.5281/zenodo.202911