Gonioctena (Gonioctena) jani Cho & Borowiec

Cho, Hee-Wook, Kippenberg, Horst & Borowiec, Lech, 2016, Revision of the Gonioctenanivosa species-group (Coleoptera, Chrysomelidae, Chrysomelinae) in the Holarctic region, with descriptions of two new species, ZooKeys 596, pp. 87-128 : 96

Taxon classification Animalia Coleoptera Chrysomelidae

Gonioctena (Gonioctena) jani Cho & Borowiec sp. n. Figs 5-6, 16, 26-28

Type material.

Holotype: ♂ (ZIN), Russia, Sakha Republic, Amginsky District, Krestyah Village, 18.VII.1928, ex Museum of Yakutia // HOLOTYPUS Gonioctena (Gonioctena) jani sp. n. Cho & Borowiec 2015. Paratypes: 3♂♂, 1♀ (ZIN), same data as holotype; 2♂♂ (NHMB), Oberer Amur // ex Orig. Samlg. J. Breit Wien; 1♂ (ABC), Eastern Yakutia Republic, Suntar-Khayata range, 1290 m, on Salix , 8.VII.2002, O. Khruleva leg.; 1♂ (ABC), Amur Reg., Zeya Distr., Zeyskiy Reservoir, Tukurlinga ridge, 21-24.VI.2006, E.V. Guskova leg.; 1♂ (TLMF), Russia, Primorsky Krai, Khasansky District, Kedrovaya Pad Nature Reserve, VII–VIII.1956, Medvedev; 1♂ (TLMF), Russia, Amur oblast, Blagoveshchensk; 3♂♂, 9♀♀ (TLMF), Russia, Yakutia Republic, Khandyga, VII.1993, L. Naglis. Each paratype specimen has a type label: PARATYPUS Gonioctena (Gonioctena) jani sp. n. Cho & Borowiec 2015.

Diagnosis.

Gonioctena jani sp. n. is closely related to Gonioctena amurensis sp. n. in having small body size and similar length of antennae, however it can be distinguished by pronotum with sparse punctures on median region and moderately dense punctures on lateral region (small and moderately dense punctures on median region and large and dense punctures on lateral region in Gonioctena amurensis sp. n.) and aedeagus rather thick with relatively short apical process (rather thin with relatively long apical process in Gonioctena amurensis sp. n.).

Description.

Measurements in mm (n = 5): length of body: 5.00-5.70 (mean 5.30); width of body: 3.00-3.40 (mean 3.20); height of body: 2.10-2.40 (mean 2.18); width of head: 1.42-1.60 (mean 1.52); interocular distance: 1.02-1.12 (mean 1.07); width of apex of pronotum: 1.57-1.75 (mean 1.66); width of base of pronotum: 2.47-2.77 (mean 2.63); maximum width of pronotum: 1.80-2.75 (mean 2.45); length of pronotum along midline: 1.30-1.45 (mean 1.37); length of elytra along suture: 3.70-4.40 (mean 3.96).

Body oblong oval and moderately convex (Fig. 5). Head black. Mandibles black, with reddish brown band near apex. Maxillary palps reddish brown or dark brown, with apical palpomere black. Antennomeres 1-7 yellowish brown, 1 and 7 slightly darkened, 8-11 reddish brown to dark brown. Pronotum reddish brown, with 3 spots or a large marking (Fig. 28). Scutellum black. Elytra reddish brown, with or without 5 pairs of black spots. Venter black, with hypomera, apical and lateral parts of abdominal ventrites 3-5 reddish brown. Legs black, with tibiae reddish brown except base and tarsi dark brown to reddish brown.

Head. Vertex weakly convex, covered with coarse and dense punctures. Frontal suture V-shaped, coronal suture absent or weak. Frons flat, strongly depressed anteriorly, covered with dense punctures. Clypeus narrow and trapezoidal. Anterior margin of labrum distinctly concave. Mandibles with 2 sharp apical teeth and a deep excavation for apical maxillary palpomere at outer side. Maxillary palps 4-segmented, with apical palpomere distinctly widened, truncate apically in male; slightly widened in female. Antennae in male almost as long as half length of body; antennomere 1 robust; antennomere 2 shorter than 3; antennomere 3 longer than 4; antennomeres 7-11 each distinctly longer than wide; antennomere 11 longest, about 2.22 times as long as wide (Fig. 26). Antennae in female almost reaching elytral humeri; antennomere 11 about 2.33 times as long as wide.

Pronotum. Lateral sides widest near base, roundly moderately narrowed anteriorly, anterior angles strongly produced (Fig. 6). Anterior and lateral margins bordered, lateral margins invisible in dorsal view. Trichobothria present on posterior angles. Disc covered with sparse punctures; lateral sides covered with much coarser and denser punctures, becoming larger toward base, partially confluent near basal margin; interspaces covered with fine and sparse punctures. Scutellum slightly wider than long, narrowed posteriorly.

Elytra. Lateral sides moderately widened posteriorly, widest beyond middle, thence roundly narrowed posteriorly. Humeral calli well developed. Disc covered with 11 regular rows of large punctures, including a short scutellar row; punctures rather irregular between 6th and 8th striae in apical half; interspaces shagreened in female, covered with fine and sparse punctures. Epipleura wholly visible in lateral view. Hind wings well developed.

Venter. Hypomera weakly rugose, with a few punctures near anterolateral corners of prosternum. Prosternum covered with coarse and dense punctures bearing long setae; prosternal process enlarged apically, bordered laterally, with sparse punctures. Metasternum covered with small and sparse punctures in median region, large and dense punctures in lateral region. Abdominal ventrites covered with dense punctures bearing short setae.

Legs. Moderately robust. Tibiae widened apically, with a tooth-like projection. Fore legs with tarsomere 1 strongly enlarged, distinctly wider than 3 in male; slightly narrower than 3 in female. Tarsal claws appendiculate.

Genitalia. Aedeagus rather thick, parallel-sided in middle, with apical process rather short, very slightly widened apically, apex rather truncate in dorsal view; moderately curved, with apical process pointed and slightly bent downward at apex in lateral view (Fig. 27). Spermatheca absent.

Etymology.

Dedicated to Jan Bezděk (Brno, Czech Republic), the well-known specialist in Chrysomelidae .

Distribution.

Russia (East Siberia, Far East) (Fig. 16).

Host plant.

One specimen was collected on Salix sp. ( Salicaceae ) in Sakha Republic.