Agrilus yuk, Jendek, Eduard & Grebennikov, Vasily V., 2019

Jendek, Eduard & Grebennikov, Vasily V., 2019, Twenty more new species of Agrilus (Coleoptera: Buprestidae: Agrilinae) from the Oriental region, Zootaxa 4564 (2), pp. 449-469: 464-466

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Agrilus yuk

sp. nov.

Agrilus yuk   sp. nov.

( Figs. 2A View FIGURES 2 , 5G View FIGURES 5 )

Description of holotype. Body length: 7.2 mm. BODY. Shape: subparallel, Posterior tapering part: short with broad apex, Profile: dorsally flattened, Color (dorsally): unicolored. HEAD. Modification: strongly convex. Vertex. Medial impression: present, Sculpture elements: rugae, Sculpture density: dense, Sculpture intensity: rough. Eyes. Size: subequal or larger than width of vertex (dorsal view), Shape: markedly protruding head outline, Lower margin: in line or below antennal socket, Median orbit: converging ventrally. Antennae. Serration: from antennomere 4. PRONOTUM. Shape: visually elongate or square, Sides: slightly arcuate, Maximal width: at middle, Anterior margin: subequal to posterior. Anterior lobe. Development: obvious, Shape: arcuate, Width: broad, Position: projecting beyond anterior angles. Posterior angles. Shape: obtuse, Apex: blunt. Disk. Convexity: flat, Impressions: medial and lateral, Medial impression: anteromedial and posteromedial, Lateral impressions (depth): shallow, Lateral impressions (width): broad. Prehumerus. Development: carinal, Shape: straight, Extent: adjoining posterior angle, Anterior end: distant from lateral pronotal carina, Posterior end: joined with posterior pronotal angle or margin. Lateral carinae. Convergence: moderate, Junction: present, Narrowest point: at posterior 1/5–1/4 of marginal carina. ELYTRA. Color: unicolored, Humeral carina: absent. Apices. Arrangement: separate. Pubescence. Extent: distal only, Distal (shape): preapical. STERNUM. Pubescence. Strip of erect pubescence: extending from prosternal lobe to metasternal projection. Prosternal lobe. Size: narrow, Distal margin: arcuately emarginate, Emargination (depth): shallow, Emargination (width): wide. Prosternal process. Shape: slightly dilated, Sides: straight, Angles: obtuse, Angles (tips): sharp, Disc: impressed, Projection (length): protruding distinctly beyond angles. Metasternum. Metasternal projection: flat. ABDOMEN. Basal ventrite. Modifications: absent. Pygidium. Apical margin: arcuate. Sternal groove. Shape on apex of last ventrite: angulately sinuate, Sinuosity (depth): markedly deep. LEGS. Metatarsus. Length to metatibia: distinctly shorter. Metatarsomere 1. Length to following tarsomeres: subequal or longer than 2–4. GENITALIA. Aedeagus. Symmetry: symmetric, Shape: widest in apical part.

Variability. Body length: 5.9–7.4 mm. Some paratypes have additional pubescenceon the anterior half of the elytra. Sexual dimorphism. The males have longer antennae, broader elytral apices, and a medial strip of erect pubescence on the sternum. The females have a markedly elongate ovipositor.

Diagnosis. Agrilus yuk   sp. nov. is similar to the Palaearctic A. sulcicollis Lacordaire, 1835   by the size, by the general habitus, by the shape of the pronotum, by the widely arcuate elytral apices, and by the narrow sternal lobe. The new species can be distinguished by the presence of the elytral pubescence, by the short prehumerus, by the lack of tubercles on basal ventrite in males, and by the shape of the aedeagus ( Fig. 5G View FIGURES 5 ).

Type material. Type locality: Northeastern Laos, Houa Phan province, 20°12–13.5'N, 103°59'.5– 104°01'E, Ban Saluei + Phou Pane Mt. , altitude 1340–1870 m. Type specimens. Holotype ♂, 1 ♂ paratype, 4 ♀ paratypes ( EJCB): “Laos-NE, Houa Phan prov., 20°12–13.5'N, 103°59'.5– 104°01'E, Ban Saluei + Phou Pane Mt., 1340–1870m, 15.iv.–15.v.2008, Lao collectors leg.”. Other types. LAOS: Houaphan: “Laos-NE, Hua Phan Province, Ban Saleui, Phou Pan (Mt), 20°12'N, 104°01'E, 7.iv–25.v.2010, 1300–1900m, leg. C. Holzschuh ” 1 ♀ paratype ( USNM); “Laos-NE, Houa Phan prov., 20°12–13.5'N, 103°59'.5– 104°01'E, Ban Saleuy + Phou Pane Mt., 1340–1870m, 2.–, Vít Kubáň & Lao coll. leg.” 1 ♂ paratype ( EJCB). GoogleMaps  

Distribution. LAOS: Houaphan.


Smithsonian Institution, National Museum of Natural History