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

description: Chersodromia yamanei sp. nov.
(Figs. 11, 18, 57–63)
Diagnosis. A small species measuring less than 1.5 mm, with narrow gena. Stylus relatively short. Katepisternum largely polished. Wings normally developed. Male terminalia: left cercus sclerotized, large and elongate; right cercus sclerotized, small; right surstylus heavily sclerotized, prominent, with tip somewhat pointed; right epandrial lamella with large expansion dorsoapically; outermost lobe of left surstylus simple, elongate. Head and thorax with black/dark brown setae. Vertical setae (2 pairs) and posthumeral setae present.
Description. Male (Fig. 11). Body length 1.15–1.19 mm; head width 0.25–0.30 mm; wing length 1.32–1.44 mm. Head (Fig. 57) black in ground-colour and greyish pollinose; palpus whitish pollinose; proboscis brown; antenna brown/dark brown; setae and setulae on head black/dark brown. Frons relatively wide; in frontal view face below antennal sockets slightly narrower than frons. Ocellar setae (2 pairs) moderate in length, as long as scape, pedicel and postpedicel combined. Vertical setae (2 pairs) as long as ocellar setae. In frontal view gena narrow, 1/7 as wide as maximum eye height. Occiput with setulae. Antenna (Fig. 58): postpedicel round and slightly higher than pedicel in lateral view, bearing setulae on anterior margin; extension of postpedicel present dorsoapically; stylus short, 2 times as long as pedicel and postpedicel combined. Palpus with 6–8 setulae; sensory pit obscure even with preparation on slide.
Thorax (Fig. 59) black in ground-colour and greyish pollinose; katepisternum largely polished; all setae and setulae black. Vestiture on thorax: 1 setula on each proepisternum; 1 pair of long, inflected postpronotal setae; 1 pair of distinct posthumeral setae; 2–3 pairs of notopleural setae; 1 pair of supra-alar setae; 1 pair of long, inflected postalar setae; 4 pair of dorsocentral setae near median line (one 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. 18) normally developed, clear, with pale brown veins. Basicosta with 1 long, black seta; 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 minute, whitish with brown tinge. Halter pale brown, large.
Legs yellowish brown, stout. All setae on legs black; setulae on legs brown/pale brown. Fore femur sparsely covered with setulae (setulae of anteroventral and posteroventral rows long; some preapical setulae strong; 2 subbasal setulae long). Fore tibia covered with setulae (especially dense on anterior surface), with 1 anteroventral preapical seta and 1 posteroventral preapical seta. Fore tibial gland indistinct. Mid femur covered with setulae, with anteroventral row of 6–9 setae, posteroventral row of 6–10 setae, 1 anterior preapical seta, 1 anteroventral preapical seta, 1 posterior prearical seta and 1 posteroventral preapical seta. Mid tibia slightly inflexed, stout, covered with setulae, with anteroventral row of 11–14 strong, black spinulae (gradual shift of length of spinulae from basal to preapical present), 1 anterior preapical seta and 1 posteroventral preapical seta. Hind femur covered with setulae, with 1 anterior preapical seta and 1 anteroventral preapical seta. Hind tibia covered with setulae, with dorsal row of 3 setae, 1 anterodorsal preapical seta, 1 anterodorsal seta, 1 anterior preapical seta, anterior row of 2 setae, anteroventral row of 2 setae and 1 ventral preapical seta. Fore, mid and hind tarsomeres densely covered with setulae.
Preabdomen sparsely covered with whitish setulae; tergites and sternites dark brown in ground-colour and sparsely greyish pollinose; membrane pale brown in ground-colour, sparsely whitish pollinose. Tergites 1–7 each with 1 or 2 indistinct, black plaques laterally and 1 pair of small pits dorsolaterally. Tergite 7 with some long setae along posterior margin. Eighth segment hidden, with some setae along posterior margin.
Terminalia (Figs. 60–63). Coloration: right surstylus shiny black; right epandrial lamella and cerci dark brown in ground-colour and entirely whitish pollinose; left surstylus, left epandrial lamella and hypandrium shiny pale brown. Right surstylus being pointed lobe (Figs. 60, 62, 63), boundary line between it and right epandrial lamella somewhat obscure. Right epandrial lamella with black setae (Fig. 60), with conspicuously developed dorsoapical expansion with apical and dorsal processes (Fig. 62). Left surstylus composed of several lobes; outermost lobe simple, slender, bearing 1 short setula at apex (Fig. 61). Left cercus slender, bearing some setae; right cercus small, apically with some setae (Fig. 63).
Female. Body length 1.27–1.39 mm; head width 0.38– 0.38 mm; wing length 1.32–1.59 mm. Closely resembling males except in structure of mid tibia and terminalia. Mid tibia not inflexed, without anteroventral row of spinulae, with 2 anterodorsal setae, 1 anterior preapical seta, 1 ventral preapical seta and 1 posterior preapical seta, sparsely with setulae. Cercus dark brown in ground-colour and sparsely greyish pollinose.
Type material. HOLOTYPE 3, labelled: Russian Far East, S. Primorye, Gamov Pen., Astaf’ev Bay, 26.viii.2010, leg. T. Maeda (IBSS). Paratypes: 17 3, 14 Ƥ, same data as holotype. Other specimens examined (in alc.): 1 Ƥ, Amur Bay, 3–5 km E. Tavrichanka, 22.viii.2010; 1 3, Andreevka, Risovaya Bay, 23.viii.2010.
Type depository. Two paratypes (male and female) are deposited in IBSS; some paratypes are in FMNH, NIAES and TMC.
Etymology. The specific epithet is dedicated to the ant taxonomist, Prof. Seiki Yamane, of Kagoshima University, Japan.
Distribution. Russian Far East: southern part of Primorsk Territory.
Remarks. This species was collected only on sandy shores (Fig. 3) and was relatively rare in every locality surveyed.
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 20-23, DOI: 10.5281/zenodo.202911