Research Article |
Corresponding author: Runzhi Zhang ( zhangrz@ioz.ac.cn ) Academic editor: Miguel Alonso-Zarazaga
© 2015 Youssef M. Omar, Runzhi Zhang, Steve R. Davis.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Omar YM, Zhang R, Davis SR (2015) A new species of the genus Orthotemnus Wollaston, 1873 (Coleoptera, Curculionidae, Cossoninae) from China. ZooKeys 472: 103-116. https://doi.org/10.3897/zookeys.472.8033
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A new species, Orthotemnus longitarsus sp. n., is described from China, representing the first record of the genus Orthotemnus Wollaston, 1873 from China. Illustrations of diagnostic features of the new species and a key to all six species of the genus Orthotemnus (including O. reflexus Wollaston, O. disparilis Pascoe, O. filiformis Champion, O. expansus Hustache and O. ulmi Zherichin) are provided. All type specimens of the new species are deposited in the National Zoological Museum in the Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
Weevil, Proecini , morphology, systematics, plectra, key, China, new record
Based on the classification of
The aim of this paper is to establish the first record of the genus Orthotemnus for China by describing a new species from Jiangsu province in eastern China and to provide a key to all the known species currently recognised in Orthotemnus.
The type specimens of the new species are deposited at the Institute of Zoology (IOZ), Chinese Academy of Sciences (CAS), in Beijing, China. Morphological observations were made using a Zeiss Semi stereomicroscope Discovery V12, and photos were taken using a Micropublisher 5.0 RTV digital camera, model MP5.0-RTV-CLR-10A-color 10 BIT, attached to the same stereomicroscope. The recognition of the new species and the key to the species are based on comparison of the Chinese specimens with the original descriptions and illustrations of the previously described species.
All measurements were taken using an ocular micrometer. Abbreviations of characters given in the text are as follows: ACL – antennal club length; ACW – antennal club width; AFL – antennal funicle length; AL – antennal length; ASL – antennal scape length; BL – body length (excluding rostrum); EL – elytral length; EWB – elytral width at base; EWW – elytral width at widest part; PL – pronotal length; PW – pronotal width (widest part); RL – rostral length; RWA – rostral width at apex; RWB – rostral width at base.
Hind wing terminology follows
Orthotemnus reflexus Wollaston, 1873: 489, by monotypy.
Body (5.50–6.60 mm) not or slightly compressed longitudinally, elongate; derm glossy, glabrous, at most with sparse setae on elytra. Rostrum rather long and robust, much shorter than pronotum; longer than head; often wider before antennal insertion (equal width throughout:
Rostrum widening after antennal insertion; scapes passing posterior margin of eye and reaching postocular constriction; temples swollen; forehead with short median furrow; sutural striae deep and depressed near scutellum; intervals smooth, equal, convex, with a single row of fine punctures, wider than striae; humeri truncate, quadrate; tarsi longer than tibiae.
Measurements (male): BL: 3.29–3.40 mm; EL: 2.33–2.38 mm; EWB: 1.02–1.08 mm; EWW: 1.02–1.08 mm; PL: 0.96–1.02 mm; PW: 0.90–0.94 mm; RL: 0.52–0.55 mm; RWA: 0.31–0.34 mm; RWB: 0.25–0.30 mm; AL: 0.90–0.94 mm; ASL: 0.40–0.42 mm; AFL: 0.30–0.31 ACL: 0.20–0.22; ACW: 0.12–0.14 mm. Measurements (female): BL: 2.58–2.80 mm; EL: 1.70–1.90 mm; EWB: 0.84–0.96 mm; EWW: 0.84–0.96 mm; PL: 0.88–0.90 mm; PW: 0.77–0.78 mm; RL: 0.48–0.50 mm; RWA: 0.26–0.28 mm; RWB: 0.19–0.20 mm; AL: 0.70–0.90 mm; ASL: 0.32–0.40; AFL: 0.20–0.30; ACL: 0.13–0.20; ACW: 0.10–0.11 mm.
Body (Figs
Colour dark reddish-brown; rostrum, antennae and legs paler brown than body.
Orthotemnus longitarsus SEM photographs. 5 ♂ habitus, lateral aspect 6 enlargement of head and prothorax, lateral aspect 7 enlargement of lateral part of metathorax 8 enlargement of serrate dorsal margin of metaventrite 9 enlargement of left elytron 10 enlargement of apical half of rostrum, lateral aspect 11 enlargement of antennal club.
Rostrum (Figs
Mouthparts. Maxillae (Fig.
Antennae (Figs
Orthotemnus longitarsus SEM photographs. 12 antenna 13 ♂ abdominal tergites 14 enlargement of portions of tergites 5 and 6 showing spiculate patches 15 enlargement of tergite 7 showing rows of plectra 16 enlargement of plectra on tergite 7 17 ♂ abdominal venter 18 enlargement of apical portion of ventrite 5.
Head oval, laterally constricted behind eyes, constriction weak dorsally, temples swollen, with subcircular punctures, fine sparse punctures behind postocular constriction, wrinkled, glossy; forehead slightly convex, broader than rostral base, with clear circular punctures, interspaces 2–3 × puncture diameter, with short median longitudinal furrow; vertex bulbous, convex, wrinkled. Eyes oval, widely separated, convex, with coarse, convex facets.
Pronotum conical, anteriorly constricted, deep laterally but weak dorsally, forming collar with large, circular punctures throughout, punctures separated by approximately 1–2 × their diameter, with abbreviated smooth median line not reaching anterior and posterior margins, dorsally and laterally convex, truncate along posterior margin.
Mesonotum (Fig.
Scutellum visible, transverse-oblong, smooth, dull.
Metanotum (Fig.
Metendosternite (Fig.
Proventriculus as in Fig.
Elytra (Figs
Hindwings (Fig.
Thoracic sterna flat; prosternum wrinkled, with deep circular punctures; procoxae separated by 0.5 × diameter of coxa; mesoventrite flush with prosterum, base bisinuate, mesocoxae separated by approximately coxal diameter; metaventrite transverse, longitudinal sulcus from base to beyond middle, with circular punctures spaced by 2–3 × diameter of puncture, meta coxae separated by slightly less than 2 × diameter of coxa; dorsal margins of metaventrite serrate (sclerolepidial setae absent, though setal sockets present; Figs
Legs (Figs
Orthotemnus longitarsus mouthparts, internal structures and hindwing. 23 left mandible 24 right mandible 25 maxilla 26 labium 27 proventriculus 28 metendosternite 29 mesonotum 30 metanotum 31 hindwing: C = Costa Sc = Subcosta Rr = radial recurrent vein R = Radius rcm = margin of radial cell 2rs, 1rs = radial sclerites pst = postradial stripe mst = medial stripe Cu = Cubital A = Anal.
Abdomen.Tergites (Figs
Male terminalia and genitalia (Figs
Female terminalia and genitalia (Figs
Holotype: male: China: Jiangsu: Jiangsu Province, Nanjing, Zijingshan, 32.30°N, 118.49°E, 05 III 2008, collected by Liang Ding (IOZ). Paratypes: 4 ♀ and 4 ♂: same data as holotype; found under trees in park.
The specific epithet is a combination of the Latin word longus and the Latinized Greek word tarsus, referring to the longer tarsus in relation to the tibia; it is a noun in apposition.
China: Jiangsu Province: Nanjing, Zijingshan.
The female (Figs
The new species here differs from other species of the genus as detailed in the key below as well as in the following features: its large size; the rostrum narrow and strongly convex, narrow basally after the antennal insertions but widening distally; the forehead with a short, median longitudinal furrow starting in the basal half and extending posteriad; the long scapes reaching the postocular constriction; the swollen temples; the transverse-oblong scutellum; the quadrate humeri; the parallel-sided tibiae; the tarsi being longer than the tibiae. This species marks the first record of the genus for China.
The genus is currently known to comprise six species, including the one newly described here, distributed as follows: O. reflexus and O. disparilis in the Australian, O. filiformis and O. expansus in the Afrotropical and O. ulmi and the new species in the Palaearctic region (
1 | Apical margin of elytra reflexed or recurved | 2 |
– | Apical margin of elytra normal, subacute | 4 |
2 | Elytral intervals flat, obsoletely punctate; prothorax conical, strongly constricted before apex; closely, rather coarsely punctate, except along abbreviated narrow median space; interspaces finely alutaceous | O. filiformis |
– | Elytral intervals depressed or weakly convex, finely shagreened or sparsely and finely punctate; prothorax slightly constricted or with flat constriction not reaching disc at apex | 3 |
3 | Rostrum longer than pronotum, equal breadth throughout, with fine, dense, shallow punctures; prothorax elongate, triangular, with evenly sparse, moderately deep punctures; base truncate and as broad as elytra, weakly constricted at apex | O. reflexus |
– | Rostrum shorter than pronotum (4:5), conical, gradually narrowing from base to apex, with fine sparse punctures; short elongate fovea between antennal insertions; prothorax less elongate than in O. reflexus; punctures round, shallow, rather dense, unevenly distributed; base weakly bisinuate, slightly narrower than elytra | O. ulmi |
4 | Antennae inserted before middle of rostrum; rostrum strongly curved at middle or at point of antennal insertions | 5 |
– | Antennae inserted behind middle of rostrum; rostrum slightly curved | O. expansus |
5 | Prothorax small, oblong, with large coarse punctures; elytra short, gradually narrowing to apex; striae with large, dense, quadrate punctures | O. disparilis |
– | Prothorax conical, constricted anteriorly; constriction deep laterally and weak dorsally, with large, circular punctures throughout; elytra long, parallel-sided until declivity; striae with large, deep, circular punctures | O. longitarsus sp. n. |
Sincere thanks are due to Dr. Boris Alexandrovich Korotyaev (Laboratory of Insect Systematics, Zoological Institute, Russian Academy of Sciences, Russia) and Dr. Aly M. Ragh (Université d’Angers, France) for their kind help. This work was supported by a CAS-TWAS Post-Doctoral Fellowship Program as well as the NNFC programs (31210103909/31172130/J1210002). Partial funding also was provided by the University of Kansas Entomology Endowment and the US National Science Foundation grant DEB1110590 (to M.S. Engel, P. Cartwright, and S.R. Davis).