Gonioctena (Brachyphytodecta) longshengensis, Cho, 2017

Cho, Hee-Wook, 2017, Two new species of the Gonioctena mauroi species-group from China (Coleoptera: Chrysomelidae: Chrysomelinae), Acta Entomologica Musei Nationalis Pragae 57 (1), pp. 173-181 : 176-178

Gonioctena (Brachyphytodecta) longshengensis sp. nov.

( Figs 3–5 , 8–10 , 13 )

Type locality. China, Guangxi Province, Longsheng, Longsheng Hot Spring, 25°53.6′N, 110°12.4′E, 360 m a.s.l.

Type material examined. HOLOTYPE: ♂, ‘ China, Guangxi A.R., 11.–14.IV.2013, Longsheng Hot Spring (forested river valley, wet rocks), 25°53.6’N, 110°12.4’E, 360 m, M. Fikáček, J. Hájek, J. Růžička leg. // HOLOTYPUS Gonioctena (B.) longshengensis sp. n. Cho & Borowiec 2014’ ( NMPC). PARATYPES: 2 ♀♀, same data as holotype plus ‘PARATYPUS Gonioctena (B.) longshengensis sp. n. Cho & Borowiec 2014’ ( NMPC).

Description. Measurements in mm (n = 3): length of body: 6.40–6.90 (mean 6.63); width of body: 4.55–4.90 (mean 4.72); height of body: 3.10–3.30 (mean 3.17); width of head: 1.85– 1.92 (mean 1.89); interocular distance: 1.15–1.25 (mean 1.20); width of apex of pronotum: 2.15–2.20 (mean 2.17); width of base of pronotum: 4.05–4.27 (mean 4.16); length of pronotum along midline: 1.80–1.87 (mean 1.84); length of elytra along suture: 4.90–5.30 (mean 5.07).

Body short-oval and strongly convex ( Fig. 3 ). Head reddish-brown with apex of mandibles black, maxillary palpomeres III–IV dark brown. Antennomeres I–V yellowish-brown, V partially darkened, VI–XI black, XI blackish-brown apically. Pronotum reddish-brown with basal margin black ( Fig. 4 ). Scutellum reddish-brown. Elytra reddish-brown with tip darkened. Venter reddish-brown. Legs black, partially blackish-brown.

Head. Vertex weakly convex, covered with sparse punctures, becoming coarser and denser towards sides. Frontal suture V-shaped, reaching anterior margin, coronal suture weak. Frons flat, strongly depressed at anterior margin, covered with dense punctures. Clypeus very narrow and trapezoidal. Anterior margin of labrum almost straight. Mandibles with two sharp apical teeth and large excavation for apical maxillary palpomere on outer side. Maxillary palps 4-segmented, with apical palpomere slightly widened, truncate apically. Antennae reaching pronotal base; antennomere I robust; II as long as III; III longer than IV; VII–X distinctly widened, VIII–X each wider than long; XI longest, about 1.47 times as long as wide ( Fig. 8 ).

Pronotum. Widest at base, roundly strongly narrowed anteriorly, anterior angles strongly produced.Anterior and lateral margins bordered, lateral margins barely visible in dorsal view. Trichobothria absent on both anterior and posterior angles. Disc covered with very sparse punctures; lateral sides covered with much larger and denser punctures; interspaces covered with fine and sparse punctures. Scutellum distinctly wider than long, narrowed posteriorly.

Elytra. Lateral sides slightly widened posteriorly, widest before middle, thence roundly narrowed posteriorly. Humeral calli well developed. Disc covered with eleven regular rows of large punctures, including short scutellar row, sometimes with additional punctures between striae; interspaces covered with fine and sparse punctures. Epipleura visible except near base in lateral view. Hind wings well developed.

Venter. Hypomera weakly rugose, with few punctures near anterolateral corners of prosternum. Prosternum covered with coarse and moderately dense punctures bearing long setae; prosternal process enlarged apically, bordered laterally, with sparse punctures. Metasternum covered with minute and sparse punctures in median region, large and dense punctures in lateral region. Abdominal ventrites covered with sparse or dense punctures bearing short setae. Legs. Moderately robust. Tibiae widened apically, with tooth-like projection. Fore legs with tarsomere I distinctly narrower than III in both sexes. Tarsal claws appendiculate.

Genitalia. Aedeagus long and thin, subparallel-sided, setose apicolaterally, with apical process rather broad, distinctly widened to lateral tooth-like projections, apex triangular in dorsal view; moderately curved, apex pointed in lateral view ( Fig. 9 ). Spermatheca C-shaped, swollen basally and apex rounded ( Fig. 10 ).

Differential diagnosis. Gonioctena (B.) longshengensis sp. nov. is almost identical with G. (B.) mauroi and G. (B.) medvedevi in body shape, coloration and setose aedeagus. From these two species, G. (B.) longshengensis sp. nov. can be distinguished only by aedeagus subparallelsided with apical process broad, widest in apical 1/3 and subequal to median lobe in width (subparallel-sided with apical process widest in middle and slightly narrower than median lobe in G. (B.) mauroi and moderately narrowed with apical process moderately widened to lateral tooth-like projections near apex in G. (B.) medvedevi ). Gonioctena (B.) kuatunensis sp. nov. differs in semicircular apex of aedeagus (triangular or subtriangular in other species).

Etymology. The species is named after the type locality, Longsheng in China; adjective.

Distribution. China: Guangxi ( Fig. 13 ).

Remarks. Several larvae were dissected from the female specimen, therefore this species is ovoviviparous ( Fig. 5 ).

Figures

Figs 1–4. 1–2 – Gonioctena (B.) kuatunensis sp. nov., holotype: 1 – dorsal habitus; 2 – head and pronotum. 3–4 – G. (B.) longshengensis sp. nov., holotype: 3 – dorsal habitus; 4 – head and pronotum. Scale bars = 1.0 mm.

Fig. 5. Larvae dissected from the female of Gonioctena (B.) longshengensis sp. nov.

Figs 6–12. 6–7 – Gonioctena (B.) kuatunensis sp. nov.: 6 – antenna; 7 – aedeagus, holotype (dorsal and lateral views). 8–10 – G. (B.) longshengensis sp. nov.: 8 – antenna; 9 – aedeagus, holotype (dorsal and lateral views); 10 – spermatheca. 11 – Gonioctena (B.) mauroi Cho & Borowiec, 2016 (after CHO & BOROWIEC 2016a), aedeagus, holotype (dorsal and lateral views). 12 – G. (B.) medvedevi Cho & Borowiec, 2016 (after CHO & BOROWIEC 2016a), aedeagus, holotype (dorsal and lateral views). Scale bars = 1.0 mm (except Fig. 10 = 0.5 mm).

Fig. 13. Distribution of Gonioctena (B.) mauroi species-group.