Pectocera truncata Liu and Jiang, 2021

Liu, Zhen & Jiang, Shi-Hong, 2021, The genus Pectocera Hope, 1842 (Coleoptera, Elateridae, Oxynopterinae) in China, with description of two new species and one new record, Journal of Natural History 55 (3 - 4), pp. 247-270 : 263-268

Pectocera truncata Liu and Jiang sp. nov.

( Figures 8–9 , 10 (14))

Type locality

Zhejiang, China.

Material examined ( SZPT)

Holotype: ♂, Zhejiang Prov., Dapan Mts. (light trap) (大盘山), 2017.V.14, leg. Jian-zhao Wu, Shenzhen Polytechnic, No. 20180023.

Diagnosis

Body red-brown, a little shiny; antennae hardly reaching middle of elytra, three antennomeres extending beyond apices of pronotal hind angles, flabellum of 3th antennomere 3.7 times longer than itself, reaching apex of 6th antennomere; 11th antennomere with a indistinct attenuation at apical 1/10; pronotum a little convex, without mediolongitudinal depression; scutellar shield truncate at hind margin; elytra striae obliterated anteriorly, but weakly depressed posteriorly with darker (black) colouration; sternite VII weakly concave laterally at middle, truncate at apex.

It is similar to P. cantori Hope, 1842 , but can be distinguished by the longer flabellum of 3rd antennomere reaching middle of 6th antennomere (reaching middle of 5th antennomere in P. cantori ), the lateral margins of pronotum convex medially (straight in P. cantori ), the pubescence dense on frons (sparse in P. cantori ), and width across eyes narrower than anterior angles of pronotum (wider than anterior angles in P. cantori ). This new species distinguishes from other known species mostly by its truncate apices of sternite VII, scutellar shield and none depressed middle part of pronotum. P. kashmirensis Schimmel, 1997 and P. tonkinensis ; Fleutiaux, 1918 would be the only two species which have truncate apices of sternite VII like P. truncata ( P. kobayashii Kishii, 1996 and P. sikkimensis Schimmel, 1994 a little truncate, others normally rounded at apex); however, they can be differed by shape of scutelluar shield, proportion antennomeres, body colour, depression on pronotum etc.

Description

Male (holotype). Body ( Figure 8 (a–c)) length 28.6 mm, width 7.2 mm; dark red-brown on head, pronotum, prosternal process, abdomen and tibiae and tarsi of legs, red-brown on elytra, ventral surface of thorax, most part of femura and trochanters of legs, and antennae; dorsal pubescence white, longer, denser, and a little swirled on pronotum and scutellar shield, recumbent, directed anterad on head, much shorter, directed posterad, and forming whitish marmoreal macula on elytra, ventral pubescence recumbent, much denser, and directed posterad.

Head. Transverse, 1.3 times wider (including eyes) than median length ( Figure 9 (a)). Frons narrowly triangularly depressed, spaces between punctures shiny and 1–2.5 puncture diameter wide, punctures simple and irregularly distributed. Labrum with anterior crenation conspicuous ( Figure 9 (e)); eye spherical, strongly prominent, ocular index 44, width across eyes a little (0.9) narrower than anterior angles of pronotum. Last segment of maxillary palpus 1.4 times longer than wide. Antennae ( Figure 9 (g)) hardly reaching middle of elytra, three antennomeres extending beyond apices of pronotal hind angles; 1st antennomere robust, subclavate; 2nd antennomere shortest, triangular, 1.1 times wider than long; 3rd antennomere 2.3 times longer than 2nd, its flabellum 3.7 times longer than itself, reaching apex of 6th antennomere; 11th antennomere 12.1 times longer than wide, 3.6 times longer than 10th antennomere, oblong with a indistinct attenuation at apical 1/10, proportions of antennomeres as follows: 100; 30; 69; 75; 76; 91; 90; 105; 99; 106; 380.

Thorax. Pronotum ( Figure 9 (b)) 1.4 times wider than long, subparallel-sided in dorsal view, widest at hind angles, anterior margin slightly emarginated behind eyes, pointed at anterior angles, lateral margin indistinctly crenate from anterior angles to middle part, weakly expanded medianly and slightly concave before hind angles, disc a little convex without medio-longitudinal depression; summit with punctures large, subumbillicate and dense, spaces between punctures 1–2 puncture diameters wide, most parts close to the summit with small and even punctures, spaces between punctures 1–2 puncture diameters wide; hind angles divergent, triangular, without carina nor basal incisions. Prosternum not shiny, umbillicate and irregularly punctate, intervals 0.2–1.5 times puncture diameters wide; anterior lobe crescentshape ( Figure 9 (c)), 4.2 times wider than long, with subumbillicate punctures uneven in density. Prosternal process parallel-sided to a little broader between fore coxae, then gradually narrowed to pointed apex. Meso- and meta-ventrites with small punctures than those on prosternum, intervals smooth, 1–3 times puncture diameters wide. Metaventrite wholly furrowed medially.

Scutellar shield ( Figure 9 (h)). 1.6 times wider than long, strongly emarginate anteriorly, widest at anterior third, then gradually narrowing to apex laterally, hind margin truncate; disc flat, obscure with small, indistinct punctures, spaces between punctures about 3 puncture diameters wide, with long (0.4 diameter of antennomere 2) white, pubescence directed posterad.

Elytra ( Figures 8 (a), 9(j)). Slender, 3.1 times longer than wide, 4.6 times longer and 1.1 times wider than prothorax respectively, widest at anterior third, parallel-sided, gradually narrowing to apex from anterior third, striae obliterated anteriorly, but weakly depressed posteriorly with darker (black) colouration, uneven with shallow and minute punctures of different size and density, interpuncture spaces flat and smooth, about 1.0–3.0 puncture diameters wide.

Legs ( Figure 9 (f)). Slender; tarsomere 4 shortest; metacoxal plate widest at fifth of mesal parts, strongly narrowed from third.

Abdomen. Surfaces of sternites III–VII like metaventrite, darker (black) medially, lighter (reddish brown) laterally and posteriorly; sternite VII ( Figure 9 (d)) weakly concave laterally at middle, truncate at apex, 1.3 times wider than long, punctures evenly distributed.

Genitalia ( Figure 9 (k–l)). Sclerotised; length of phallobase to penis (measured medially) 0.2, penis reaching beyond apex of parameres, gradually narrowed to pointed apex; parameres gradually narrowing to apico-lateral expansion which evenly curved laterally and 1.5 times longer than wide.

Female

Unknown.

Etymology

The name of the new species is derived from ‘ truncate ’ referring to truncate apices of sternite VII and scutellar shield.

Distribution

China (Zhejiang) ( Figure 10 (14)).

Figures

Figure 8. Pectocera truncata Liu and Jiang sp. nov. Holotype, male, (a) habitus, dorsal view; (b) habitus, ventral view; (c) habitus, lateral view.

Figure 9. Pectocera truncata Liu and Jiang sp. nov. Holotype, male, (a) head, dorsal view; (b) pronotum, dorsal view; (c) thorax, ventral view; (d) sternite VII, ventral view; (e) labrum, dorsal view; (f) hind leg, ventral view; (g) antenna, dorsal-lateral view; (h) scutellar shield, dorsal view; (i) abdomen, ventral view; (j) elytra; (k) aedeagus, ventral view; (l) aedeagus, dorsal view.

Figure 10. 1–15: Distribution map of Pectocera Hope, 1842. 1: P. attenuator Liu and Jiang sp. nov.; 2: P. babai Kishii, 1990; 3: P. brevicollis Candèze, 1878; 4: P. cantori Hope, 1842; 5: P. fleutiauxi Schimmel, 1997; 6: P. formosana Kishii, 1990; 7: P. fortunei Candèze, 1873; 8: P. hige Kishii, 1993; 9: P. jiangxiana Kishii & Jiang, 1994; 10: P. kobayashii Kishii, 1996; 11: P. kucerai Schimmel, 2006; 12: P. sechuana Schimmel, 2003; 13: P. tonkinensis Fleutiaux, 1918; 14: P. truncata Liu and Jiang sp. nov.; 6: P. formosana Kishii, 1990; 15: P. yaeyamana Suzuki, 1976.