Liroetis aurantiacus, Bezděk, 2021

Bezděk, Jan, 2021, Redefinition of Liroetis, with descriptions of two new species and an annotated list of species (Coleoptera: Chrysomelidae: Galerucinae), Acta Entomologica Musei Nationalis Pragae 61 (2), pp. 529-614 : 546-547

Liroetis aurantiacus sp. nov.

( Figs 57–60 , 65–70 )

Liroetis apicicornis [misidentification]:Kංආඈඍඈ (1989a): 82 (faunistics). Type locality. Thailand, Nan Province, Doi Phu Kha.

Type material examined. Hඈඅඈඍඒඉൾ:J ( Figs 57–60 ), ‘ THAILANDIA (Nan) / Doi Phu Kha nat. res. / 26.IV.1999 / leg. D. Hauck [w, p] // Liroetis , prope: / apicicornis Jacoby / det. A. Warchalowski [w, p] // ex. coll.A. Warchalowski / National Museum / Prague, Czech Republic [w, p]’ ( NMPC). Pൺඋൺඍඒඉൾඌ: 3 ♀♀, ‘ THAILANDIA (Nan) / Doi Phu Kha nat. res. / 26.IV.1999 / leg. D. Hauck [w, p] // ex. coll.A. Warchalowski / National Museum / Prague, Czech Republic [w, p]’ ( NMPC); 1 J, ‘THAI, N, Mae Hong Son / prov., Soppong env., 600m, / 28.v.–2.vi.1999, / M. Říha leg. [w, p]’ ( JBCB); 1 ♀, ‘ Thailand, Kanchanaburi pr. / Phatad Valley, mixed sec. / forests and culture countryside / 14.– 15.9.2009, V. Hula lgt. [w, p]’ ( JBCB); 1 ♀, ‘ THAILAND, Prov. Prachin / Buri, Sakaerat Ecol. / Research Institue, [w, p] // No. 42, beaten, / 6.VI.2001, E. Horváth & Gy. Sziráki [w, p]’ ( HNHM); 1 J 1 ♀, ‘ Thailand, Chiang Mai Prov. 100 / m N from Chiang Mai, Chiang / Dao Hill Resort env. 545–640 m, / N 19°32′47″, E 99°04′53″ / 17–25.V.2016 A. Zamesov leg. [w, p]’ ( PRCS); 1 ♀, ‘NE Cambodia, / Mondulkiri prov., / Bu Sra waterfall, / xi.2005, R. Tropek leg. [w, p]’ ( JBCB); 1 J 1 ♀, ‘ Cambodge / Kompong-Kedey / Vitalis – 191 [w, h] // ex coll. J. Achard / National Museum / Prague, Czech Republic [w, p]’ ( NMPC); 1 ♀, ‘ Cambodge / Kompong-Kedey / Vitalis V–1914 [w, h] // ex coll. J. Achard / National Museum / Prague, Czech Republic [w, p]’ ( NMPC); 1 J, ‘S VIETNAM / Dalat City / 21.– 27.4.1994 / Pacholatko & Dembicky [w, p]’ ( NHMW); 1 J, ‘ Annam / Mus. Pragen- / se [w, p]’ ( NMPC); 1 J, ‘Kham Khon / 1923 [w, p] // Indo China / Coll. Dussault [w, p] // Liroetis / apicicornis / Jacoby [h] / Det. S. Kimoto, 19 [p] 87 [w, h]’ ( NHMB); 2 JJ, ‘ LAOS: Ban Van Heue / 20 km E of Phou-kow- / kuei, 15–31.V.1965 [w, p] // Native Collector / BISHOP [w, p] // Liroetis / apicicornis / Jacoby [h] / Det. S. Kimoto, 19 [p] 87 [w, h]’ ( BPBM); 1 J, ‘ LAOS: Ban Van Heue / 20 km E of Phou-kow- / kuei, 15–31.V.1965 [w, p] // Native Collector / Collector [w, p]’ ( BPBM); 1 J, ‘ CHINA, Yunnan, Mengla / [in Chinese], Mohan [in Chinese] / hillside, 21°11′14.2″N 101°41′0.2″E, [w, p] // 910 m, swept, / 3.VIII.2012, / leg. Dávid Rédei [w, p]’ ( HNHM); 1 ♀, ‘Chapa [w, h] // Le Moult vend. / via Reinbek / Eing 1–1957 [w, p] // Coeligethes [h] / V. Laboissière – Dét. [w, p]’ ( ZMUH). The specimens are provided with one printed red label ‘ HOLOTYPUS, [or PARATYPUS] / Liroetis / aurantiacus sp. n. / J. Bezděk det., 2020’.

Description. Body length. JJ 6.2–8.1 mm (holotype 7.8 mm), ♀♀ 7.5–8.3 mm.

Male (holotype, Figs 57–60 ). Body completely orange brown, apices of mandibles black, antennomere XI with black sensilla patch.

Head ( Fig. 59 ). Labrum transverse with widely rounded anterior angles, surface with six setigerous pores in transverse row bearing pale seta. Anterior part of head convex, covered with sparse large punctures, setae visible only at anterolateral angles. Space below eyes with deep oblique grooves for insertion of antennomere I. Nasal keel sharp, moderately convex. Interantennal space 0.77 times as wide as antennal insertion. Interocular space 1.77 times as wide as transverse diameter of eye. Frontal tubercles slightly elevated, almost smooth, subpentagonal, with anterior apices divergent, separated by apex of nasal keel. Vertex impressed behind frontal tubercles, surface covered with fine punctures. Antennae short, 0.75 times as long as body, length ratio of antennomeres I to XI equals 100: 23: 77: 69: 69: 69: 69: 61: 54: 54: 77. Antennomere I bent, IX–XI distinctly flattened ventrally, XI with black sensilla patch on inner side.

Pronotum ( Fig. 59 ) transverse, 1.95 times as wide as long, lustrous, covered with fine punctures and very fine microsculpture. Anterior margin moderately concave, posterior margin rounded, lateral margins rounded (nearly angulate). Anterior and posterior margins thinly bordered, lateral margins widely bordered. Anterior angles triangularly projected, posterior angles obtusangulate, all angles with setigerous pore bearing pale seta. Several small pores with short setae also on lateral margins.

Scutellum triangular with rounded tip, surface slightly convex covered with fine punctures on apical half of scutellum, glabrous.

Elytra convex, glabrous, 1.80 times as long as wide (measured at humeral calli), 0.71 times as long as body, divergent posteriorly, widest in posterior third, covered with very fine confused punctures. Humeral calli well developed. Epipleura wide in anterior half, gradually narrowed in middle and disappearing in posterior third.

Underside. Anterior coxal cavities semiopen posteriorly. Abdominal ventrite IV with semicircular oblique impression and with hook-like lamela directed posteriorly in middle of posterior margin ( Fig. 69 ), ventrite V with large channel-like groove, wider basally, narrower apically, middle part constricted.

Legs. Protarsomere I narrow, elongate triangular, length ratio of protarsomeres I–IV equals 100: 71: 64: 100. Mesotarsomere I subtriangular, length ratio of mesotarsomeres I–IV equals 100: 100: 72: 136. Metatarsomere I narrow, subparallel, length ratio of mesotarsomeres I–IV equals 100: 68: 47: 79. Metatibial spur present, thin and sharp. Claws with large appendices.

Aedeagus ( Fig. 65 ). Median lobe of aedeagus 3.92 times as long as wide; apical 2/5 narrow, subparallel, apex incised, basal 3/5 wide, parallel. Lateral view: apical part hook-like, basal part almost straight; lateral elevation placed in middle, cavitous. Dorsal process 4.39 times as long as wide, 0.68 times as long as median lobe of aedeagus; parallel, apex slightly wider, transversely cut. Lateral view: dorsal process with hook-like apical part, basal 2/3 straight.

Female. Metatibial spur present, thin and sharp. Last abdominal ventrite with wide shallow emargination on posterior margin, pygidium with narrow incision at apex ( Fig. 66 ). Sternite VIII subpentagonal, posterior margin bisinuate in middle part and with short triangular incision in middle, surface covered with long setae in posterior half, tignum 0.5 times as long as sternite VIII ( Fig. 68 ). Spermatheca with nodulus well developed, globular, cornu C-shaped ( Fig. 67 ).

Differential diagnosis. Liroetis aurantiacus sp. nov. is very similar to L. baolocanus sp. nov. The two species form L. aurantiacus species-group characterised by metatibial spur present in both sexes, antennae short, pronotum tranverse, with bordered anterior margin, anterior coxal cavities semiopen posteriorly, abdominal ventrite IV in male with small vertical hook-like process directed posteriorly, and peculiar aedeagus structure. Liroetis aurantiacus sp. nov. differs from L. baolocanus sp. nov. in orange brown body and median lobe of aedeagus with apical 2/5 narrow and subparallel (body yellowish brown and median lobe of aedeagus with apical third wide and oval in L. baolocanus sp. nov.). Due to body colouration and transverse pronotum L. aurantiacus sp. nov. has been often misidentified as L. apicicornis distributed in southern India. Liroetis apicicornis is larger (body length 9.5–10.3 mm), has longer antennae with black last two antennomeres and completely different structure of aedeagus (cf. Figs 65 and 347 ).

Etymology. The species name aurantiacus (meaning orange) refers to body colouration; adjective.

Distribution. Thailand, Laos, Vietnam, Cambodia, China (Yunnan).

Comments. The records of L. apicicornis from Thailand, Laos and Vietnam (Kංආඈඍඈ 1989a) refer to Liroetis aurantiacus sp. nov. based on the examination of the relevant specimens.

Figures

Figs 57–64. New species of Liroetis. 57–60 – L. aurantiacus sp. nov., male, holotype (7.8 mm). 57 – Dorsal view; 58 – lateral view; 59 – head and pronotum; 60 – labels. 61–64 – L. baolocanus sp. nov., male, holotype (7.8 mm). 61 – Dorsal view; 62 – lateral view; 63 – head and pronotum; 64 – labels.

Figs 65–71. Details of new species of Liroetis. 65–70 – L. aurantiacus sp. nov. 65 – Aedegus in dorsal, lateral and ventral views; 66 – female pygidium; 67 – spermatheca; 68 – sternite VIII; 69 – male abdomen in ventral and lateral views. 70–71 – L. baolocanus sp. nov. 70 – Aedegus in dorsal, lateral and ventral views; 71 – male abdomen in ventral and lateral views. Scales: 0.5 mm for Figs 65–66, 68 and 70, 0.25 mm for Fig. 67; 1 mm for Figs 69, 71.

Figs 347–351. Aedeagus of Liroetis, dorsal and lateral views, apex of dorsal process in frontal view. 347 – L. apicicornis Jacoby, 1896; 348 – L. latispinus (Chen, 1976); 349 – L. pallidulus (Jiang, 1990); 350 – L. reitteri (Pic, 1934); 351 – L. violaceipennis Zhang, Li & Yang, 2008. Fig. 348 reproduced from JංൺඇǤ (1990). Scale 0.5 mm.