Trachystolodes neltharion, Wang & He, 2021

Wang, Cheng-Bin & He, Li, 2021, Trachystolodes neltharion sp. n. from Yunnan, China (Coleoptera, Cerambycidae, Lamiinae), Zootaxa 5032 (2), pp. 295-300 : 295-298

Trachystolodes neltharion sp. n. 死亡之DZOik牛

Figs. 1A–C ; 2A–H ; 3A–H

Type material. Holotype: ♂, CHINA, Yunnan, Dehong, Yingjiang, Tongbiguan [云南省德ż傣ÉŝIJÉh治州u江 县ṣd关乡], N24.52631° E97.70649°, alt. 1286 m, 29.IX.2020, Shao-Fu Chen leg. ( MYNU).

Description. Holotype male. Body 20.2 mm long, widest just after elytral humeri. Length of particular body parts (mm): head, 3.3; pronotum, 4.6; elytra, 12.4; width: head, 5.0; pronotal base, 4.6; elytral humeri, 6.8.

Habitus ( Figs. 1A–C ). Body oval. Integumentary color of body and appendages blackish; eyes blackish. Body mostly clothed with dense, short, recumbent and light brown pubescence, paler on antennae and legs. Pronotum fringed with short yellowish setae on anterior and posterior margins. Scutellum densely clothed with short, erect, black pubescence. Besides light brown pubescence, elytra sparcely with short, strong, erect and black setae. Each elytron with a wing-shaped, large, black patch of short erect pubescence, from basal 2/5 to apical 1/3; besides middle patch, each with 2–3 smaller black patches posteriorly; all black patches bordered with short, recumbent, yellowish pubescence. Femoral apices (except ventral sides) and dorsal sides of tibiae covered with short, recumbent, golden yellow pubescence.

Head ( Figs. 1A, C ) subcylindrical, 1.5 times wider than long, widest after eyes, slightly narrowed posteriorly. Vertex, frons and genae with dense, small, deep and subround punctures. Anteclypeus transverse, without setae or evident punctures; anterior margin straight. Frons wider than long, with a fine median groove extending from anterior margin to occiput. Vertex moderately concave; antennal tubercles prominent.

Mouthparts. Labrum transverse, densely covered with brown setae dorsally; anterior margin substraight. Mandible short, regularly arcuate at outer edge. Maxillary and labial palpi both truncated at apices.

Antennae ( Figs. 1A–C ) long, about 2.3 times as long as body, with apical six antennomeres exceeding elytral apices. Antennomeres with length ratio from scape to antennomere XI: 4.80: 1.00: 5.57: 4.96: 4.66: 4.35: 4.16: 3.92: 3.23: 3.18: 6.02. Scape subcylindrical, nearly as long as antennomere IV. Pedicel knob-like, short, distinctly thinner than scape. Antennomeres III–X straight, gradually decreasing in length. Antennomere III 1.2 times longer than pronotum, 1.2 times longer than scape, and 1.1 times longer than IV. Antennomere XI arcuate, the longest, almost twice longer than X.

Pronotum ( Fig. 1A ) broader than long, length as long as posterior width, gently swollen laterally and with lateral spines at anterior 3/7. Lateral spine conical, short, with tapered apex laterally directed. Surface with dense, small, deep and subround punctures. Disk with three distinct calli: lateral two small and tuberculate, and central one subrectangular, with a shallow longitudinal furrow at midline, notched apically.

Scutellum ( Fig. 1A ) linguiform, apically rounded.

Elytra ( Fig. 1A ) oval, 1.8 times as long as humeral width, widest just after humeri. Humeral width 1.5 times wider than pronotal base. Lateral margins subparallel from humeri to middle, then gradually narrowing towards rounded apex. Surface strongly punctate, with glabrous granules of different size before middle patch on dorsal surface and posterior limit of middle patch on lateral side. Dorsal granules forming three strong longitudinal ridges: ridge I relatively weak, from basolateral side of scutellum to basal 1/6; ridge II rather strong, from middle of basal border to basal 1/6; ridge III rather strong, from posterior of humerus to anterior of black middle patch; rest of granules smaller, located among three ridges. Lateral granules strong, gradually becoming smaller posteriorly.

Legs ( Figs. 1A–C ). Femora moderately long; metafemora slightly exceeding abdominal ventrite VI. Tibiae slightly sinuate, moderately long; mesotibia with a distinct indentation at apical 1/3. Tarsomere I the longest, but not longer than II+III; III deeply bilobed. Claws widely divergent.

Ventral side ( Fig. 1C ). Prosternum transversely and widely wrinkled; prosternal process concave at midline, apically truncated. Mesosternal process raised around midline in basal half, apically truncated. Metanepisternum wedge-like, slender; anterior margin almost straightly oblique; ventral margin distinctly curved at anterior area and slightly tapered posteriorly.

Abdomen. Abdominal tergite VII ( Fig. 2A ) subhexagonal, widely rounded at posterior margin; tergite VIII ( Fig. 2C ) subhexagonal, weakly emarginate at posterior margin, apical 1/3 of dorsal surface and apical 2/3 of lateral margins with long setae. Abdominal ventrites finely punctate; ventrite VII ( Fig. 2B ) subtrapezoidal, distinctly emarginate at posterior margin; ventrite VIII ( Fig. 2D ) with apical sclerotized area crescent, evenly curved at posterior margin; spiculum relictum ( Figs. 2D–E ) stout, about 2.5 times as long as apical part. Spiculum gastrale ( Figs. 2F–H ) with stem 2.6 times longer than branches; stem gently curved in lateral view ( Fig. 2H ).

Male genitalia. Tegmen ( Figs. 3A–B ) widest at middle, gently curved ventrally in lateral view ( Fig. 3C ); parameres 1/4 length of tegmen, moderately elongate, gradually convergent towards round apices, each apex with short setae of various lengths in apical 3/4 and several long ones near apex ( Fig. 3D ); tegminal struts of connected basally. Median lobe ( Figs. 3E–F ) shorter than tegmen, moderately curved ventrally in lateral view ( Fig. 3G ); dorsal plate ( Figs. 3E, H ) obtuse at apical margin; ventral plate ( Figs. 3F, H ) slightly longer than dorsal plate, rounded at apical margin; basal struts ( Figs. 3E–F ) 2/5 length of median lobe.

Female. Unknown.

Etymology. This species is named after Neltharion (also known as Deathwing), a fictional character from the game ‘ War of Warcraft ’ and ‘ World of Warcraft ’, a fearsome black dragon, for similar shape of the black middle patch to the wing of the dragon. A noun in apposition.

Distribution. China (Yunnan).

Differential diagnosis. Trachystolodes neltharion sp. n. has striking differences to its congeners by the following characters: scutellum clothed with black pubescence ( Fig. 1A ) (others with brown to castaneous pubescence); besides black middle patch, each elytron with 2–3 smaller black patches posteriorly ( Fig. 1A ) (others with only one black middle patch, at most some inconspicuous spots posteriorly); elytral granules strong, especially of these on ridge II & III ( Figs. 1A–B ) (others with distinctly weaker elytral granules); ventrite VIII with apical sclerotized area crescent, evenly curved at apical margin ( Fig. 2D ) ( T. huangjianbini and T. tonkinensis notched at middle of apical margin, T. tianjialini umbrellashaped and not evenly curved at apical margin, T. bimaculatus unknown).

Figures

FIGURES 1A–C Habitus of Trachystolodes neltharion sp. n., holotype, ♂. (A dorsal view; B lateral view; C ventral view)

FIGURES 2A–H Trachystolodes neltharion sp. n., holotype, ♂: A abdominal tergite VII; B ventrite VII; C–E segment VIII; F–H spiculum gastrale. (A, C, G dorsal view; B, D, F ventral view E, H lateral view)

FIGURES 3A–H Male genitalia of Trachystolodes neltharion sp. n., holotype: A–C tegmen; D parameres; E–G median lobe; H apical part of median lobe. (A, E dorsal view; B, F ventral view; C, G lateral view; D, H apicodorsal view)