Oberea acuta Gressitt, 1951

Li, Zhu, Cuccodoro, Giulio & Chen, Li, 2021, On the identity of Oberea acuta Gressitt, 1951, O. bisbipunctata Pic, 1916, O. notata Pic, 1936 and O. shimomurai Kurihara & N. Ohbayashi, 2007 (Coleoptera, Cerambycidae, Lamiinae) with a new synonym, Zootaxa 5039 (3), pp. 352-362 : 353-356

Oberea acuta Gressitt, 1951

( Figs.1–4 )

Oberea acuta Gressitt, 1951: 629 . Type locality: China, Sichuan; Breuning, 1962: 206; Hua, 2002: 219; Lin & Tavakilian, 2019: 347; Danilevsky, 2020: 427.

Oberea bisbipunctata (nec, Pic, 1916): Gressitt, 1939: 99, pl. 3, figs. 11 &12. Gressitt, 1951:593; Pu, 1980: 121, pl.12, fig. 170.

Oberea notata (nec Pic, 1936): Kurihara, 2009: 416, figs. 20, 84–90.

Redescription. Body ( Figs. 1–3 ) 12.0–14.0 mm long and 2.0 mm wide. Head black, antennae dark brown to black, scape black; pronotum testaceous or red brown, with four or five black disctal spots: two round black spots beside center, two black markings at base on each side, and one small black spot in the middle at base, the latter occasionally absent, all those markings sometimes fused ( Fig. 2 ); scutellum black or yellow brown; elytra black except for testaceous area near scutellum; abdomen testaceous except occasionally parts of sides of first two or first three segments ( Fig. 3e–h ); legs predominantly reddish brown, tibiae and tarsi darker, hind tibiae black. Body clothed with short pale gray pubescence.

Vertex distinctly depressed at middle with a groove; eyes very large, lower lobes twice as long as gena in male and 1.5 times as long as gena in female. Frons as long as wide in male ( Fig. 3a ) and 2 times as long as wide in female ( Fig. 3b ). Antennae almost reaching apical 7/8 th of elytra in male ( Fig. 1g ), shorter in female, reaching apical 3/4 th of elytra ( Fig. 1e & 1f ); third segment longer than scape and fourth. Pronotum slightly wider than long or as long as wide, with lateral outlines weakly convex and subparallel in dorsal view; disc slightly raised in middle, finely and densely punctured. Scutellum almost squared, slightly emarginated. Elytra nearly 3.5 times as long as humeral width, and 3.5 times as long as head and prothorax combined, slightly narrowed in middle and broadened preapically; elytral apex obliquely emarginate with acute external angle; disc with fine punctures arranged in six longitudinal rows, gradually finer and irregular towards apex. Abdominal ventrites with punctures at sides. Hind femora reaching middle of abdominal segment II; hind tibiae almost 1.5 times as long as tarsi. Abdominal ventrite V with shallow triangular depression in male ( Fig. 3c ) and medially grooved in female ( Fig. 3d ).

Male terminalia. Tergite VIII broader than long, apex truncated and moderately emarginated, clothed with short hairs ( Fig. 4a ); tegmen curved in lateral view; parameres elongate, mostly covered with long hair on apical half, base of each paramere transversely and obliquely ridged ventrally, the latter ridge covered with dense hairs ( Fig. 4b ); aedeagal median lobe slightly curved in lateral view, median struts 3/5 times as long as whole median lobe, dorsal plate slightly longer than ventral plate, median foramen rounded ( Fig. 4c ); endophallus with 2 pairs of rods on apical portion, longer pair slender baculiform, about 2 times as long as shorter pair ( Fig. 4d–e ).

Female genitalia. Capsule of spermatheca with sclerotized rounded apical lobe and a stalk; spermathecal duct longer than capsule; spermathecal gland extended from strongly sclerotized ring attached to spermathecal duct ( Fig. 4f ).

Material examined. CHINA: SICHUAN: Holotype, ♀, Chengdu, China , alt. 500 met., 1940, leg. T. L. Sie ( SYSU); 1♀, Mt. Omei , 31.VII. 1938, leg. C. S. Tai ( SYSU); 1♀, Sichuan Pronvince , Chengdu , 1941 ( SWU); 1♀, China , Sichuan, Emei Mountain , Guangfusi , 19.V.1962, leg. Lin Duan-fang et al. ( SWU); 2♂♂, China , Sichuan, Mt. Emei , Baoguosi , 9.V.1957, leg. Cheng Han-Hua ( NKU); 1♂ 1♀, ditto, but 11.V.1957 ( NKU); 1♂ 1♀, Sichuan, Emeishan , 6.VI.1955, leg. Ke-Ren Huang, Gen-Tao Jin ( IZCAS); 1♀, Sichuan, Emeishan , 580m, 24.VI.1955, leg. Tian-Rong Huang ( IZCAS); 1♂, same data but 25.VI.1955, leg. Huai-Ju Leng ( IZCAS); 1♀, Sichuan, Baoguosi, 700m, 20.IV.1957, You-Cai Lu ( IZCAS); 4♂♂ 3♀♀, Sichuan, Emeishan, Baoguosi, 550-750m, 5-9.V.1957, leg. Ke-Ren Huang ( IZCAS); 1♀, same data but 12.V.1957 ( IZCAS); 1♀, Sichuan, Emeishan, Baoguosi, 550-750m, 2.VI.1957, leg. Ke-Ren Huang ( IZCAS); 2♂♂ 1♀, same data but 3.VI.1957 ( IZCAS); 1♂ 1♀, same data but 7- 8.VI.1957 ( IZCAS); 1♀, Sichuan, Emeishan, Baoguosi, 550-750m, 12.VI.1957, leg. You-Cai Lu ( IZCAS); 7♂♂ 1♀, same data but 6-11.V.1957 ( IZCAS); 1♀, same data but 17.V.1957 ( IZCAS); 1♀, same data but 22.VI.1957 ( IZ- CAS); 1♂, same data but 5.VII.1957; 2♂♂ 1♀, Sichuan, Emeishan, Baoguosi, 550-750m, 7-8.VI.1957, leg. Zong- Yuan Wang ( IZCAS); 1♀, same data but 26.V.1957; 1♀, same data but 9.VI.1957 ( IZCAS); 3♂♂ 1♀, same data but 25-26.V.1957, leg. Fu-Xing Zhu; 3♂♂, same data but 20-24.V.1957; 2♂♂, same data but 11-21.VI.1957; 2♂♂, Sichuan, Emeishan, Qingyinge, 23.V.1957, leg. Ke-Ren Huang ( IZCAS); YUNNAN: 1♂, Yunnan Province, Cangyuan County, VII.2007, leg. Wu Gui-Yi ( SWU); 1♂, Yunnan Province, Yanjin, 6.V.1920, leg. Yang Fu-Xing ( SWU).

Distribution. China (Sichuan, Yunnan).

Remarks. In the original description Gressitt (1951) stated that the holotype was male, however it is actually female ( Fig.1a, b ). In the materials from Mt. Emei we found another female with the same color patterns as the holotype ( Fig. 1c ), but others were identified as O. notata or O. bisbipunctata . However, after careful examination of all these specimens we came to the conclusion that they are all conspecific, and that the species is just quite variable with respect to the color pattern on pronotum and abdomen ( Figs. 2 , 3e–h ).

This species is very similar to O. notata , from which it differs mainly by the abdominal ventrite V yellowish brown rather than black, by the rods of the intersac and by the shape of the spermatheca.

Figures

FIGURE 1. Habitus of O. acuta. a–b. holotype, female, from Chengdu, Sichuan, a. dorsal view; b. lateral view; c–d. female, from Mafu temple, Mt. Emei, Sichuan; c. dorsal view; d. lateral view; e–g. females, e. from Baoguo temple, Mt. Emei, Sichuan; f. Chengdu, Sichuan; g. from Mt. Emei, Sichuan.

FIGURE 2. Color variation of pronotum of O. acuta. a–e. males; f–h. females.

FIGURE 3. External morphology of O. acuta; a–b. head. a. male; b. female; c–d. abdominal ventrite V; c. males; d. female; e–h. color variation of abodomen; e–f. males; g–h. females.

FIGURE 4. Genitalia of O. acuta. a–e. male genitalia. a. tergite viii; b. tegmen, ventral view; c. median lobe, ventral view; d–e. sclerities in endophallus, d. ventral view; e. dorsal view; f. spermatheca.