Nemedina zaitsevi, Sinclair & Shamshev, 2003
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publication ID |
https://doi.org/ 10.1080/0022293021000007480 |
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persistent identifier |
https://treatment.plazi.org/id/038FBC1B-AF12-CD0A-FD81-257113C0FA23 |
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treatment provided by |
Carolina |
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scientific name |
Nemedina zaitsevi |
| status |
sp. nov. |
Nemedina zaitsevi View in CoL sp. nov.
( figures 1–10 View FIGS View FIGS View FIG )
Diagnosis
Small, shining black, humped, with short legs and hyaline wings. Very similar to E. alamirabilis , but differing by its largely pale halter, longer postpedicel, apically arched female cerci and some details of the scutum setation and wing venation.
Description
Male. Length: body 1.6–1.8 (holotype 1.8) mm; wing 1.6–1.7 (holotype 1.7) mm.
Head. Black in ground-colour, 1.5–1.6× higher than wide. Holoptic, upper ommatidia enlarged, border between upper and lower ommatidia indistinct, lacking ommatrichia. Postcranium subshining, with fine grayish pruinescence, setation reduced. Upper postocciput somewhat convex, lower postocciput produced posteriorly. Row of minute dark postoculars present; lower postocciput and postgena with some minute setulae. Ocellar triangle raised above ommatidia, lacking setae. Frons reduced to small area just above antennae, with fine grayish pruinescence. Face flat, almost parallel-sided, 1.5× wider than anterior ocellus, with fine grayish pruinescence; lower half mostly membranous. Antenna black, similar to female (see figure 1 View FIGS ); scape lacking setulae, short, somewhat similar in length to pedicel; pedicel subovate, ringed with minute subapical setulae; postpedicel conical, pubescent, strongly tapered; stylus arista-like, two-segmented, lacking apical seta-like segment; postpedicel 2.0× as long as scape and pedicel combined, 2.5–2.7× longer than wide and subequal in length to arista. Proboscis ( figure 2 View FIGS ) directed forward; 2.7–3.2× shorter than head is high, largely black. Palpus black, elongate, cylindrical, shorter than proboscis, clothed in dark setulae. Lacinia slender with weakly sclerotized apex; freely projected but closely appressed to labial paraphysis; shorter than hypopharynx. Labrum strongly tapered to pointed tip; epipharyngeal blades and carina absent ( figure 3 View FIGS ). Hypopharynx straight, shorter than labrum with rounded apex. Labellum large, paler than remaining proboscis, bearing scattered dark setulae; more than 10 pseudotracheae present.
Thorax. Black in ground-colour, shiny, with fine grayish pruinescence; setation reduced. Prosternum small, separate from proepisternum. Antepronotum with few setulae, remaining prothorax bare. Postpronotal lobe distinctly pronounced, lacking setae; apex of lobe sometimes pale. Scutum strongly arcuate, unicolour. Acrostichal setulae arranged in two irregular rows; dorsocentral setulae similar to acrostichals, minute, undifferentiated, arranged in several irregular rows; two notopleural setae; one postalar seta. Scutellum with four yellowish marginal setae. Laterotergite bare. Anterior and posterior spiracles black.
Legs. Short, unmodified, with reduced setation; almost wholly yellowish brown, with fine grayish pruinescence; coxae and trochanters darker, apex of femora of all legs and often knees and extreme base of tibiae yellowish. Coxae and trochanters with scattered setulae, fore coxa bearing longer setulae at apex. Femora and tibia lacking prominent, erect setae. Fore and mid femora slender; hind femur broadened, laterally compressed. Fore and mid tibiae slender, subequal in length to femur; fore tibial gland absent; hind tibia laterally compressed, shorter and slightly broader than its femur. Anteroapical and posteroapical combs present on fore and hind tibiae, respectively.
Wing ( figure 4 View FIGS ). Hyaline, with fine microtrichia; lacking basal costal seta(e); venation similar to that figured by Chandler (1981: 107, figure 2 View FIGS ). Veins brownish yellow; CuA, A and veins closing cell cup pale and very thin. Stigma indistinct, 1 1
confined to inner apex of R. C terminating slightly beyond M; Sc evanescent; 1 1+2
R equally thickened along its whole length; R parallel to M for apical two- 1 4+5 1+2
thirds; CuA convex; CuA strongly arched to wing margin; A distinctly bent on 2 1 1
basal fourth, arched to wing margin. Anal lobe broad, angle less than 90°; alula reduced. Squama pale, with pale fringe. Halter knob largely pale, stem darker near base.
Abdomen. Black, shiny, with fine grayish pruinescence, bearing scattered minute setulae; lacking longer posteromarginal setae. Segments 1–5 broad, remaining segments progressively narrowed. Tergite 8 less than half width of sternite 8. Abdominal plaques present as minute scars along anterior margin of tergites (visible in macerated specimens).
Terminalia. Symmetrical, unrotated, held upright nearly 90° to abdomen (figures 5,10) in dried specimens; concolorous with abdomen. Cercus small, truncate apically in lateral view, weakly sclerotized ( figure 5 View FIGS ); hypoproct subtriangular, setose, continuous ventrally with broad sclerotized inner face of epandrium. Epandrium clothed with pubescence, bearing several short setae only; epandrial lamellae with dorsal bridge anterior to cerci ( figure 7 View FIGS ). Epandrial lobe (figures 5,7) dorsal to surstylus, narrow, pointed apically; clothed in short setae; inner basal margin with several setae mounted on short tubercles. Surstylus broad, weakly articulated to epandrium; inner apical margin with row of short, flattened setae; subepandrial sclerite broad, articulated with lateral bacilliform sclerites; bacilliform sclerites bear short, rounded basal knob. Hypandrium short, subrectangular, with truncate apex projecting obliquely (figures 5,6); anterolateral corner extending to articulate with epandrium. Postgonites absent. Ventral apodeme(s) beneath ejaculatory apodeme absent. Gonocoxal apodeme with slender and greatly lengthened rod-like process, longer than hypandrium ( figure 6 View FIGS ), slightly shorter than ejaculatory apodeme; narrow in ventral view. Phallus tube-like, arched posteriorly; apical third mostly membranous, with anterior margin more darkly pigmented, bearing lateral spicules ( figure 6 View FIGS ); broad base of phallic plate arching and narrowing from phallus to subepandrial sclerite. Ejaculatory apodeme separated from phallus by membranous sperm sac (figures 5,6); strongly sclerotized; extended posteriorly as short knob or falcrum, facilitating lever-like action of apodeme ( figure 5 View FIGS , arrow); apex prolonged anteriorly as hooked lip with expanded margin.
Female. Length: body 1.6–1.7 (allotype 1.7) mm; wing 1.6–1.7 (allotype 1.7) mm.
Similar to male except as follows: dichoptic, all ommatidia of equal size. Frons very broad, forming equilateral triangle, shiny, bearing minute marginal setulae. Ocellar tubercle slightly prominent, level with ommatidia. Postpronotal lobe with two to three minute setulae. Abdomen brownish in some specimens. Sclerites progressively narrower, but not shorter on posterior segments. Tergite 8 broad, produced laterally toward sternite 8; genital chamber with broad sclerotized floor and pair of dorsal plates. Tergite 10 absent ( figure 8 View FIGS ). Cerci black, broad, pubescent, with apex slightly arched dorsally. Spermathecal receptacle darkly pigmented, spherical, attached to long duct ( figure 9 View FIGS ).
Type material
HOLOTYPE male [label printed in Cyrillic ]: OKP. CEHEKa [env. of Senek]/KazaxCTaH [ Kazakhstan]/ynHK [chink]/16. V.[1]978 B.zaňuEB [ V. Zaitsev].
ALLOTYPE: female, same data and style as in holotype.
PARATYPES: five males, four females, same data and style as in holotype. All material is housed in ZIN except one male and female paratype stored in ZFMK .
Etymology. The new species is named in honor of the collector, Dr Vadim F. Zaitsev (St.Petersburg, Russia).
Distribution. Kazakhstan (Mangyshlak Prov.).
Biology. Nothing is known of the biology of this new species. According to label data it was collected on the abrupt border (or chink, a local name for this landscape) of the Ustyurt Plateau (north-western region). This region is classified as semi-desert with scattered vegetation (mainly Artemisia sp.).
The lack of epipharyngeal blades may indicate that this genus visits flowers and possibly feeds on pollen. Several flower visiting empidoids have similar mouthpart morphology, including Iteaphila Zetterstedt and Atelestinae (Sinclair and Cumming, unpubl. data). However, epipharyngeal blades remain present in some flower visiting taxa such as Anthalia Zetterstedt.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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