Naviauxella pseudolabiosa Matalin, 2019

A. V. Matalin, 2019, Two new species of the genus Naviauxella Cassola, 1988 (Coleoptera: Cicindelidae) from Central Vietnam, Russian Entomological Journal 28 (1), pp. 17-22 : 20-22

Naviauxella pseudolabiosa Matalin , sp.n.

Figs 2 , 9–10, 13, 15–18, 20–21 .

TYPE MATERIAL. Holotype — ♂, Vietnam, Gia Lai Province, ~ 40 km NEE of Pleiku, Kon Ka Kinh National Park , 14°12´11´´N 108°18´54´´E, h = 890 m, 9–22.V.2016, leg. D. Fedorenko ( ZISP) ; Paratypes — 2♂♂ 1♀, some labeled as the holotype (1♂ 1♀ — MPU, 1♂ — SIEE) .

DESCRIPTION. TL — 6.6–7.0 mm in males ( Fig. 2 ), 7.6 mm in female.

Head glabrous, bluish-green; genae finely striated, bluish-green in males and bluish-violet with greenish anterior margin in female; clypeus finely wrinkled laterally, golden-green with distinct copper reflection and narrow bluish anterior and posterior margins; frons golden-green with large central purple-lilac patch, distinctly rugose except small smooth bright green, blue-green or blue reflected antennal plates; vertex golden-green with light bluish tinge and narrow purple-lilac strip in the centre, coarsely rugose, with prolonged impression near anterior edge of each eye and long seta on each of them, supraorbital plates golden-green, with 10–11 long shallow striae with straight sides in outer half and with wavy sides in the inner half ( Fig. 13 ), with a single long seta near posterior edge of each eye; occiput finely rugose, greenish-gold with bright purple-lilac central area. Mandibles pale yellow except narrowly brownish teeth. Labial and maxillary palpi pale yellow or yellow-brown except dark-brown apical joints. Labrum throughout covered by isodiametric microsculpture, from light brown to brown in males and dark brown-black in female, transverse, 2.0–2.11 times wider than long in males (LL = 0.45–0.5, LW = 0.9–0.95) and 1.83 times wider than long in female (LL = 0.6, LW = 1.1), with four long submarginal setae, a broad low central carina, wide shallow central notch bounded by two lateral teeth in males ( Fig. 9 ) and three apical teeth with medial tooth distinctly protruding beyond the others, and distinctly sinuate margins before outside apical teeth in female ( Fig. 10 ). Antennae filiform, reaching over half of elytral length; first four antennomeres in males from light-brown to dark-brown with light greenish tinge, in female black-brown with distinct golden-green reflection; scape with a single long apical seta; third antennomere with three-four, while fourth antennomere with one short spiniform white seta on outer side except for short apical setae; antennomeres 5–11 black, finely and regularly pubescent.

Pronotum glabrous, nearly quadrate, 1.0–1.04 times longer than wide ( PL = 1.3–1.4, PW = 1.25–1.4), converging sightly towards base, distinct rounded lateral sides in males and slightly rounded lateral sides in female, a thin shallow golden midline and well-marked bluish-green or blue anterior and posterior transverse grooves; pronotal disc transversely rugose, golden-green with purple reflection in the centre and bright V-shaped purple-lilac patch along a midline, apical and basal lobes golden-green with purple-lilac edges, lateral sides bluish-green in males and blue-violet in female ( Figs 15–16 ). Prosternum and proepisterna glabrous and smooth, bluish-black with weak greenish reflection; mesepisterna in males blue-violet, finely wrinkled with few short white setae at base, in female bluish-black, glabrouse, with two short white seta at base and long slightly sinuated longitudinal groove with deep small oval pit in basal third; metepisterna in males greenish-blue, evenly covered by short white appressed setae, in female blue-violet with a few short white appressed setae along anterior edge only; meso- and metasternum in males greenish-blue with light golden tinge, in female bluish-violet with light greenish reflection, metasternum with sparse short white appressed setae on sides.

Elytra 1.86–1.91 times longer than wide ( EL = 3.9–4.2, EW = 2.1–2.2 in males; EL = 4.7, EW = 2.5 in female), indistinctly dilated apically in males and more clearly dilated in female, with rounded shoulders, low basal hump and very shallow depression behind them; elytral surface black-bronze, entirely covered by isodiametric sculpticells of microsculpture and numerous greenish-blue punctures that are deeper in basal third, shallow around middle band and practically invisible in apical half, lateral margin blue-violet; scutellum copper-bronze in some specimens with light golden-green tinge, finely rugulose; suture deep-bronze, clearly separated from elytral disc except basal quarter; epipleura light brown; apices widely and gradually rounded in males and more sharply in female; a white elytral pattern present by basal portion of humeral lunula which visible in female as very small point only in front view, by short middle band including relatively wide lateral portion and more small rounded apical portion in practically invisible in some specimens, as well as by basal portion of apical lunula which is comma-shaped in males ( Fig. 17 ) and oval in female ( Fig. 18 ).

Abdominal sternites first to fifth greenish-blue in males and blue in female, sixth sternite dark-brown, sternites third to sixth with a few short and thin white hair-like setae in the centre, fouth sternite with one pair while fifth sternite with two pairs of long thin setae along anterior margin. Fore and midddle coxae pale-yellow with greenish-blue reflection, the former with appressed white setae on anterior surface while the latter with setae on anterior and posterior sirfaces and with long single apical seta, hind coxae bluish-green with light golden reflection, with white appressed setae along lateral margin only and a single apical seta. Trochanters pale-yellow, fore trochanters with a long apical seta. In males femora pale-yellow with brownish anterior surface, tibia and tarsi dark-brown with light blue metallic lustre, in female legs dark-brown except light-brown posterior surface of femora.

Aedeagus 2.0–2.1 times shorter than elytra (AL = 1.9– 2.0), with short basal portion and shortly tapered rounded apex with short distinct lateral carina; flagellum stout, medium long ( Fig. 20–21 ).

ETYMOLOGY. The new species is named “ pseudolabiosa ” because it very similar outwardly to Naviauxella labiosa Naviaux, 1996 .

COMPARATIVE NOTES. Naviauxella pseudolabiosa sp.n. is readily distinguished from other Naviauxella species by the shape of aedeagus ( Fig. 21 ) [compare with Figs 24–39 in Matalin, 2018b] and similar to N. labiosa . As the male of N. labiosa is not yet known, the comparison of these species is based only on the features of the females. In N. pseudolabiosa sp.n. labrum shorter (LW/LL = 1.83) with medial tooth distinctly protruding beyond the others, and sinuate margins before outside apical teeth ( Fig. 10 ) while in N. labiosa labrum longer and trapeziform (LW/LL = 1.70–1.73), with practically straight ( Fig. 11 ) or indistinct wavy ( Fig. 12 ) lateral margins and with medial tooth slightly protruding beyond the others; the rugosity of supraorbital area in N. pseudolabiosa sp.n. coarser with 14 striae ( Fig. 13 ) while in N. labiosa the rugosity of supraorbital area finer with 16–18 striae ( Fig. 14 ).

NOTES. The previously mentioned specimens of Naviauxella pseudolabiosa sp.n. (see type meterial) were erroneously recorded as N. acciavatti Naviaux, 1996 from the Vietnamese Province of Gia Lai [ Wiesner et al., 2017].

The key to Naviauxella Cassola, 1988 species of Vietnam [ Wiesner et al., 2017] must be modified as follows:

1. Elytra with longitudinal brown band from base to middle lunule ............................................................................ 2

— Elytra without longitudinal brown band ..................... 3

2. Apical part of elytral middle lunule slender and descending .................... N. rufovittata Cassola et Werner, 1995

— Apical part of elytral middle lunule roundish and/or upturning ............................ N. snowiana Cassola, 2002

3. Apical lunula with very long sublateral portion practically extending suture .............................. N. fedorenkoi sp.n.

— Apical lunula with short or without sublateral portion 4

4. Labrum yellow-brown. Middle band broad ................... ......................................... N. acciavattii Naviaux, 1996

— Labrum brown to brown-black. Middle band narrow. 5

5. Labrum with medial tooth slightly protruding beyond the others and no sinuate lateral margins before outside apical teeth ...................................... N. labiosa Naviaux, 1996

— Labrum with medial tooth distinctly protruding beyond the others and sinuate margins before outside apical teeth ... ................................................... N. pseudolabiosa sp.n.

The couplets 13–17 of the key to Naviauxella Cassola, 1988 species [ Matalin, 2018b] must be modified as follows:

13. Apical lunula incomplete, comma-shaped ................ 14

— Apical lunula incomplete, oval or rounded ............... 18

14. Elytra copper-bronze ................................................. 15

— Elytra brown-black, dark bronze or black-bronze. Aedeagus with a straight ventral edge and bent ventrally apex .... 16

15. Elytra with golden-green reflection. The rugosity of supraorbital area coarser, with 12 striae. Apical lunula with short sublateral portion. Aedeagus with a small convexity on ventral side and slightly bent apex rounded dorsally .................................................. N. loebli Matalin, 2018

— Elytra with light purple reflection. The rugosity of supraorbital area finer, with 16 striae. Apical lunula with very long sublateral portion practically extending suture. Male unknown ................................ N. fedorenkoi sp.n.

16. Aedeagus with a widely rounded blunt apex. Middle band represented by a triangular lateral spot, in some specimens by an additional small apical spot .................................. ................................................ N. shooki Wiesner, 2010

— Aedeagus with a tapered rounded apex ..................... 17

17. Elytra dark bronze. Middle band made up of two small dark yellowish spots; apical lunula small. Aedeagus with a long thin apex .............. N. declivitatis Naviaux, 1991

— Elytra black-bronze. Middle band represented by relatively large triangular lateral portion and small rounded apical spot; apical lunula large. Aedeagus with a short wide apex ................................................... N. pseudolabiosa sp.n.

18. Apical portions of middle band small. Aedeagus with a short, rounded apex gradually bent ventrally ................ ......................................... N. pinratanai Naviaux, 1991

— Apical portions of middle band larger. Females ....... 19

19. Total length no more than 7.0 mm. Labrum shorter, entirely reddish-yellow ....... N. durandi Naviaux, 2012

— Total length more than 7.0 mm. Labrum dark brown or black-brown ............................................................... 20

20. Total length 7.4–7.8 mm. Labrum longer, 1.70–1.73 times wider than long, trapeziform, with medial tooth slightly protruding beyond the others and no sinuate lateral margins before outside apical teeth. The rugosity of supraorbital area finer, with 16–18 striae ...................... .............................................. N. labiosa Naviaux, 1996

— Total length 8.2 mm. Labrum shorter, 1.83 times wider than long, with medial tooth distinctly protruding beyond the others and sinuate margins before outside apical teeth. The rugosity of supraorbital area coarser, with 14 striae ................................................... N. pseudolabiosa sp.n.

Figures

Figs 1–2. Naviauxella spp, habitus of the holotypes, dorsal view: 1 — N. fedorenkoi sp.n., female; 2 — N. pseudolabiosa sp.n., male. Рис. 1–2. Naviauxella spp, габитусы голотипов, сверху: 1 — N. fedorenkoi sp.n., самка; 2 — N. pseudolabiosa sp.n., самец.

Figs 9–21. Naviauxella spp: 9–10, 13, 15–18, 20–21 — N. pseudolabiosa sp.n.; 11–12, 14, 19 — N. labiosa; 9–12 — labrum; 13–14 — head, dorsal view (13 — left half, 14 — right half); 15–16 — pronotum; 17–19 — right elytron; 20–21 — aedeagus, left lateral view (20 — photo; 21 — drawing); 9, 15, 17, 20–21 — male; 10–14, 16, 18–19 — females; 9, 11, 14–15, 17, 19–21 — holotypes; 10, 13, 16, 18 — paratype; 11, 14, 19 — specimen from Vietnam (CMNH, photos by Peter Schüle); 12 — specimen from Cambodia. Figs 9–21. Naviauxella spp: 9–10, 13, 15–18, 20–21 — N. pseudolabiosa sp.n.; 11–12, 14, 19 — N. labiosa; 9–12 — верхнЯЯ губа; 13–14 — голова, сверху (13 — леваЯ половина, 14 — права половина); 15–16 — переднеспинка; 17–19 — правое надкрылье; 20–21 — Эдеагус, слева (20 — фотографиЯ; 21 — рисунок); 9, 15, 17, 20–21 — самец; 10–14, 16, 18–19 — самки; 9, 11, 14– 15, 17, 19–21 — голотипы; 10, 13, 16, 18 — паратип; 11, 14, 19 — ЭкЗемплЯр иЗ Вьетнама (CMNH, фотографии Петера Шуле); 12 — ЭкЗемплЯр иЗ Камбоджи.