Tenomerga angulinota, Wang & Hájek, 2018

Wang, Cheng-Bin & Hájek, Jiří, 2018, Two new species of Tenomerga Neboiss from eastern Asia (Coleoptera: Cupedidae), Zootaxa 4526 (4), pp. 531-546 : 533-538

publication ID	https://doi.org/ 10.11646/zootaxa.4526.4.6
publication LSID	lsid:zoobank.org:pub:064028DD-D9FD-4480-8D08-34F6ACC0B215
DOI	https://doi.org/10.5281/zenodo.5979226
persistent identifier	https://treatment.plazi.org/id/472D87F5-FFB7-FF9A-FF29-FC27F6FCFC65
treatment provided by	Plazi
scientific name	Tenomerga angulinota
status	sp. nov.

Treatment

Tenomerga angulinota View in CoL sp. nov.

( Figs 1 View FIGURE 1 A–B; 2A; 3; 4; 5A–B; 6)

Type material. Holotype: ♂ (NMPC), LAOS-NE, Houa Phan prov., / 20°12–13.5' N 103°59.5' – 104°01'E / Ban Saleuy+Phou Pane Mt., / 1340–1870 m, 2.–22.vi.2011, / Vít Kubáň & Lao collectors leg. // Primary mountain forest, / at light + individual collecting. / Laos 2011 Expedition / National Museum Prague, Czech Republic // HOLOTYPE ♂ / TENOMERGA / angulinota sp. nov. / Jiří Hájek des. 2017. Paratype: 1♀, LAOS-NE, Houa Phan prov., / 20°13'09–19'' N 103°59'54'' – / 104°00'03''E, 1480–1510 m, / PHOU PANE Mt., 1.–16.vi. / 2009, Vít Kubáň leg. // Primary mountain forest, / at light. / Laos 2009 Expedition: / NHMB Basel, / NMPC Prague // PARATYPE ♀ / TENOMERGA / angulinota sp. nov. / Jiří Hájek des. 2017 (NMPC).

Description. Male holotype. Habitus ( Fig. 1A View FIGURE 1 ). Body oblong and flat. Colour pattern: head with scales and setae mostly pale greyish, but yellowish brown on labrum, lateral parts of tempora and from inner basal parts of P2 to P3. Scape with scales mostly yellowish brown, but pale greyish in anterobasal part; pedicel with scales yellowish brown; antennomere III with setae reddish brown; antennomeres IV–XI with setae dark brown. Pronotum ( Fig. 2A View FIGURE 2 ) with scales mostly yellowish brown to brown, but pale greyish along anterolateral and lateral margins, and on an incurved line from anterior angle to posterior angle. Scutellar shield ( Fig. 2A View FIGURE 2 ) with scales dark brown. Elytra with scales more or less alternately-tricolored, however not conspicuous: interval I mostly dark brown (brown in basal 1/35 and from apical 1/7 to 1/25; yellowish brown and pale greyish from apical 2/9 to 1/7; pale greyish in apical 1/ 25); interval II mostly brown (yellowish brown and pale greyish from basal 3/8 to midlength and from apical 2/9 to 1/8); interval III mostly brown (including junction of intervals III+V; yellowish brown and pale greyish from basal 2/7 to 3/7, from apical 2/9 to 1/6, from apical 1/8 to 1/12, and in junction of intervals (III+V)+VII); interval IV mostly yellowish brown (pale greyish in basal 1/10); interval V mostly yellowish brown (pale greyish in basal 1/ 20; brown shortly around midlength and from apical 1/5 to 1/9); interval VI mostly yellowish brown (pale greyish in basal 1/20); interval VII mostly yellowish brown (brown from apical 1/5 to junction of intervals III+V (yellowish brown shortly around apical 1/9)); interval VIII mostly brown (pale greyish in basal 1/20 and in apical 1/15; yellowish brown from midlength to apical 1/7); interval IX mostly brown (pale greyish in basal 1/20 and in apical 1/10; yellowish brown from basal 2/9 to apical 2/5 (sporadically pale greyish)); margin mostly brown (pale greyish shortly around apical 1/12 and in apical 1/25). Legs with setae yellowish brown, except some pale greyish scales on profemora and protibiae.

Head ( Fig. 2A View FIGURE 2 ) widest at eyes; ratio width/length = 1.9. Protuberances: P1 large and moderately high, almost upright, and acutely conical at tip; P2 smaller and lower than P1, almost upright, and acutely conical at tip; P3 elevated and wide; median furrow narrow but distinctly deep. Tempora distinctly short, ratio temporal/head length = 0.2. Eyes large, protruding, ratio eye length/width = 1.7, ratio eye/head length = 0.6. Antennae long, relatively strong, ratio antenna/body length = 0.7.

Pronotum ( Fig. 2A View FIGURE 2 ) widest at apices of basal branches of anterior angles; ratio width/length = 1.5. Anterior angles bifid: apical branch more acute, moderately pointed anterolaterally; basal branch more obtuse, weakly pointed laterally to slightly anterolaterally. Posterior angles subrectangular. Lateral margin between basal branch of anterior angle and posterior angle slightly incurved. Median longitudinal ridge narrow, well defined, with fine median furrow.

Elytra elongate and more or less parallel-sided; ratio length/width = 3.2. Nine longitudinal rows present, consisting of transversely oblong window-like punctures. Interval elevations: interval I distinctly raised; interval III distinctly raised in basal 1/6; interval V distinctly raised from subbase to junction with interval III; interval VII moderately raised from humerus to junction with interval III+V; interval VIII moderately raised in basal 1/6.

Abdomen. Tergite VIII ( Fig. 3A, C View FIGURE 3 ) scutiform, closely covered with minute spines. Sternite VIII ( Fig. 3B View FIGURE 3 ) subtriangular, rounded at apex, sparsely covered with setae in apical part. Tergite IX ( Fig. 3D View FIGURE 3 ) widest at basal 1/3; median section shortly extended beyond laterals and subtruncated at apex. Sternite IX ( Fig. 3D View FIGURE 3 ) widest at midlength, and acuminated in apical part. Bifurcate process ( Fig. 3 View FIGURE 3 F–G) with strut occupying 1/6 of its total length; furcal arms widest at about basal 1/5, straight in lateral view; dorsolateral angles simply arched in lateral view.

Aedeagus ( Fig. 4 View FIGURE 4 A–C) equal to 1/6 body length, widest at basal 1/4, almost simply and gradually tapering apically; ratio length/width = 3.8. Dorsal plate ( Fig. 5B View FIGURE 5 ) slightly shorter than median lobe, bilobate in apical part, each papilla-like at apex. Paramere slender, slightly curved medially in apical part. Ventromarginal spine long, arising from basal 2/5 of paramere and reaching base of apical hook. Apical hook ( Fig. 4D View FIGURE 4 ) evenly curved. Median lobe ( Fig. 5A View FIGURE 5 ) short, not reaching apical hook; apex wide and narrowly notched at middle; lateral margins widened mesoventrally, forming longitudinal flaps rounded at apices. Basal opening large, cordiform.

Measurements. Body length 12.7 mm. Length (mm) of particular body parts: head (1.1), antenna (9.3), eye (0.7), tempus (0.3), pronotum (1.4), elytron (10.0); width (mm): head (2.1), eye (0.4), pronotum (2.1), elytra (3.1). Proportion of antennomeres from base to tip in mm (length × width): 0.6 × 0.5, 0.2 × 0.3, 0.6 × 0.3, 0.7 × 0.4, 0.9 × 0.4, 1.0 × 0.4, 1.0 × 0.4, 1.0 × 0.4, 1.0 × 0.3, 1.0 × 0.3, 1.3 × 0.3. Ratio elytral/pronotal length = 7.3; ratio elytral/ pronotal width = 1.5; ratio body length/elytral width = 4.0.

Female. Similar to male in general appearance ( Fig. 1A View FIGURE 1 ), but distinct in following characters: head widest at tempora; tempora relatively longer, ratio temporal/head length = 0.3; eyes relatively smaller, ratio eye/head length = 0.5; antennae broader but shorter, ratio antenna/body length = 0.6.

Female genitalia ( Fig. 6 View FIGURE 6 A–B). Styli two segmented, oval in both dorsal and lateral views. Arrangement of setae on styli and apical parts of coxites as shown in Fig. 6 View FIGURE 6 C–E.

Measurements. Body length 16.4 mm, significantly larger than male. Length (mm) of particular body parts: head (1.4), antenna (10.4), eye (0.7), tempus (0.4), pronotum (1.9), elytron (12.9); width (mm): head (2.5), eye (0.4), pronotum (2.9), elytra (4.1). Proportion of antennomeres from base to tip in mm (length × width): 0.8 × 0.6, 0.2 × 0.4, 0.8 × 0.5, 0.8 × 0.5, 0.9 × 0.5, 1.1 × 0.5, 1.1 × 0.5, 1.1 × 0.5, 1.1 × 0.4, 1.1 × 0.4, 1.3 × 0.4. Ratio elytral/ pronotal length = 6.9; ratio elytral/pronotal width = 1.4; ratio body length/elytral width = 4.0.

Egg ( Fig. 6F View FIGURE 6 ) elongate; ratio length/width = 4.7. Chorion ( Fig. 6G View FIGURE 6 ) with surface sculpture not continuously reticulate but separately subcircular (diameter ca. 0.01 mm), and armed with tubercles or spines of different sizes. Micropylar end large and thick. Altogether, ca. 20 eggs were found in the female paratype.

Differential diagnosis. The new species has rather unique appearance within the genus Tenomerga , the presence of bifid anterior angles of the pronotum in particular—a character shared with South African T. leucophaea only. The latter species differs from all other Tenomerga species by the aedeagal structure: the median lobe is almost as long as parameres, and it is rounded apically; the dorsal plate is only half the length of the median lobe; basal opening is very short. Hörnschemeyer (2009) doubted the assignment of T. leucophaea within the genus—he pointed out that T. leucophaea forms a distinct monophyletic clade together with Cupes capitatus Fabricius, 1801 and the genus Rhipsideigma Neboiss, 1984 .

On the other hand, Tenomerga angulinota sp. nov. has the apomorphies characterising the genus Tenomerga sensu Hörnschemeyer (2009) : a short median lobe of the aedeagus, not reaching the base of the apical hooks; and a dorso-ventral notch at the apex of median lobe. In addition to body colour pattern and bifid anterior pronotal angles, it differs from all other Tenomerga species from the combination of the characters on P1, P2 and P3 of head, lateral margins of pronotum, longitudinal rows and interval elevations of elytra, abdominal tergite IX and bifurcate process, apical hooks, median lobe and dorsal plate of aedeagus, and setation of styli and valvifers.

In addition, Tenomerga angulinota sp. nov. seems to be rather unique in characters on the egg. This structure is known only for a few Tenomerga species ( Neboiss 1984; C.-B. Wang, unpublished data), in which the egg chorion has the surface sculpture continuously reticulate, without tubercles or spines or armed with minute tubercles or spines; the micropylar end is small and globular. But in the new species, the chorion has surface sculpture consisting of well separated subcircles, armed with tubercles or spines of different size; and the micropylar end is large and thick.

Etymology. The specific epithet refers to the peculiar shape of the pronotal angles. It is an adjective in the nominative singular.

Collecting circumstances. Attracted to lights.

Distribution. Known so far only from the type locality in Houaphanh [= Houaphan] Province, northeastern Laos.