Scutellathous nanlingensis Liu & Jiang

Liu, Zhen & Jiang, Shi-hong, 2019, The genus Scutellathous Kishii, 1955 (Coleoptera, Elateridae, Dendrometrinae) in China, with description of three new species, ZooKeys 857, pp. 85-104 : 85

Scutellathous nanlingensis Liu & Jiang sp. nov. Figs 6, 7, 8, 12

Type locality.

Ruyuan Nanling Mts, Guangdong, China.

Material examined.

Holotype: ♂ ( SZPT), labels: 1) Guangdong Prov., Ruyuan Nanling Mts (961 m, 24°55'31.02"N 113°01'18.33"E) (南岭), 2008. VI–VII, leg. Lei Gao et Kai-xuan Chen; 2 ) Holotype, Scutellathous nanlingensis sp.nov., Liu et al. 2019; 3) No. 20180355.

Diagnosis.

Antennae barely reaching apices of pronotal hind angles, antennomere 3 2.2 times longer than 2 and 1.1 times longer than 4; pronotum with narrow median furrow throughout length, shiny with fine, weakly umbillicate punctures; scutellar shield 1.5 times longer than wide; punctures on elytra becoming absent near apex; aedeagus with penis reaching beyond parameres, gradually narrowing to obtuse apex.

Scutellathous nanlingensis is similar to S. sasajii Kishii, 2001, but can be separated from the latter by the short antennae of male (hardly or just reaching apices of pronotal hind angles; longer in S. sasajii , with apical three antennomeres exceeding apices of the hind angles), with narrow median furrow through the length of the pronotum (in S. sasajii the pronotum lacks longitudinal furrow), and the longer male penis.

Description.

Male (holotype). Body (Fig. 6 a–c) length 11.7 mm, body width 3.0 mm; red-brown, head, pronotum, base of elytra, ventral parts of the body and antennae darker, apex of mandible, inner margin of hypomeron, fore and middle coxae, apical parts of legs and elytra paler, more yellowish or reddish; dorsal pubescence yellow, semi-recumbent, longer, sparse and pointed anterad on pronotum and head, pointed posterad on elytra, ventral pubescence more recumbent, thinner and denser, especially on abdomen.

Head. Anterior edge truncate in dorsal view (Fig. 7b), spaces between punctures shiny and 1 puncture diameter wide, punctures umbillicate and uniform, nearly contiguous in triangular, shallow depression and near supra antennal carina (Fig. 7a); eye, semi-spherical, ocular index 74; last segment of maxillary palpus 2.5 times longer than wide; antennae (Figs 6a, 7j) barely reaching apices of pronotal hind angles, antennomere 3 to 10 moderately serrate, attached apico-dorsally, antennomere 1 robust, longest and subclavate, antennomere 2 shortest, obconic, 1.7 times longer than wide, antennomere 3 elongated triangular, 2.2 times longer than 2 and 1.1 times longer than 4, antennomere 11 oblong, 5.6 times longer than wide, 1.1 times longer than antennomere 3, proportions of antennomeres as follows: 100; 43; 93; 82; 80; 76; 75; 70; 67; 72; 99.

Thorax. Pronotum (Fig. 7b) nearly 1.2 times longer than wide in dorsal view, parallel-sided, except strongly arched anteriorly and weakly concave before hind angles, widest at posterior 1/3 and apices of hind angles; disc broadly flat medially, with narrow median furrow throughout length (Fig. 7b), shiny with fine, weakly-umbillicate punctures, spaces between punctures (Fig. 7i) 1 to 2 puncture diameters wide medially, weakly umbillicate with interspaces 0.5 to 1 puncture diameter wide laterally and posteriorly; hypomera with spaces between punctures 1 to 2 puncture diameters wide; hind angles not divergent, apex acute, with carina reaching basal third of pronotum, gradually approaching side posterad; sublateral incisions long. Prosternum (Fig. 7c, 7d) shiny and sparsely punctate, interspaces 2 to 3 puncture diameters wide; anterior lobe 2.4 times wider than long, with dense, coarse, punctures. Prosternal process (Fig. 7c, 7d) straight in lateral view, abruptly concave behind procoxae and obtusely pointed at apex. Meso- and meta-ventrites smooth with punctures like on prosternum. Metaventrite furrowed medially throughout length, except shallow to absent on the posterior 1/10.

Scutellar shield. (Fig. 7f) 1.5 times longer than wide, parallel-sided, weakly pointed anteriorly, posterior edge arched; disc convex, with small, simple, sparse punctures, spaces between punctures 2-3 puncture diameter wide, with long, yellow outwardly-oriented pubescence.

Elytra. Slender, 2.8 times longer than wide, 2.8 times longer and 1.2 times wider than prothorax, longitudinally oviform, shiny, anterior half nearly parallel-sided, narrowing to apex from midlength, widest at apical third, with deeply-punctate striae, strial punctures elongate, the interpuncture spaces about 1-2 puncture diameters wide (Fig. 7h), the interstriae elevated, smooth with small irregular and sparser punctures, interpuncture spaces about 2 to 3 puncture diameters wide, punctures becoming absent near apex (Fig. 6a).

Legs. Slender (Fig. 7e); tarsomere 3 with longer lobe than tarsomere 2, tarsomere 4 shortest; metacoxal plate (Fig. 7g) with basal half parts subparallel-sided, then gradually narrowing laterally.

Abdomen. Surface (Fig. 6b, 7g) of sternites III-VII like metaventrite, with punctures denser and pubescence shorter; sternites VI–VII missing.

Genitalia. Aedeagus (Fig. 8a-d) with penis reaching beyond parameres, gradually narrowing to obtuse apex; parameres sinuate laterally at midlength, narrowed before rounded pre-apical expansion, apices rounded-acute.

Female. Unknown.

Larva. Unknown.

Etymology.

The new species named after Nanling Mts in Guangdong prov., referring to its only known locality.

Distribution.

China: Guangdong (Nanling Mts) (Fig. 12).

Biology.

Unknown.

Remarks.

Genitalia of this specimen is shrunken, membranous parameres apices are folded in (Fig. 8c).