Macrolycus graciliramus Y. Yang, Du & Liu, 2025

Du, Ruolan, Yang, Yuxia, Yang, Xingke & Liu, Haoyu, 2025, Taxonomic study of the Macrolycus gracilis group (Coleoptera: Lycidae), with descriptions of four new species from China, European Journal of Taxonomy 981, pp. 265-279 : 271-273

publication ID	https://doi.org/10.5852/ejt.2025.981.2825
publication LSID	lsid:zoobank.org:pub:B777C9F1-2913-4810-B6F6-5A654AF7C26A
persistent identifier	https://treatment.plazi.org/id/556987F9-FF9B-FFD7-59B8-0858FE1F7360
treatment provided by	Plazi
scientific name	Macrolycus graciliramus Y. Yang, Du & Liu
status	sp. nov.

Treatment

Macrolycus graciliramus Y. Yang, Du & Liu sp. nov.

urn:lsid:zoobank.org:act:

Figs 1 View Fig , 3D–F View Fig , 4D–E View Fig

Diagnosis

This species can be easily distinguished from all others of the M. gracilis group by the male antennae with extremely slender branches on antennomeres III‒X ( Fig. 4D View Fig ). The species more resembles M. gracilis Pic, 1923 in the presence of lamella on antennomere III, but differs in the following characters: longer antennae, overlapping basal ¾ length of elytra when inclined, lamella of antennomere III shorter, 0.7× as long as joint itself; black pronotum; apical part of phallus gradually narrowed distad in ventral view ( Fig. 3E View Fig ). In comparison, in M. gracilis , the antennae are shorter, at most reaching basal ⅔ length of elytra, lamella of antennomere III is longer, as long as joint itself; pronotum is orange; apical part of the phallus is parallel-sided at apical 1 /5 portion in ventral view (Li 2015: fig. 7u).

Etymology

The specific epithet is derived from the Latin ‘ gracilis ’ (‘slender’) and ‘ ramus ’ (‘branch’), referring to the slender lamellae on male antennomeres III‒X.

Type material

Holotype

CHINA • ♂; Guangxi, Longsheng, Huaping, Anjiangping ; 4 Jun. 2023; H.Q. Lin and S.L. Yuan leg.; HBU(E)410057; MHBU.

Paratypes

CHINA • 2 ♂♂; same data as for holotype; HBU(E)410059 to 410060; MHUB • 2 ♀♀; same data as for holotype; HBU(E)410061 to 410062; MHUB • 1 ♀; same data as for holotype; 2 Jun. 2023; HBU(E)410063; MHBU .

Description

Male ( Fig. 4D View Fig )

MEASUREMENTS. Length 10.0– 10.6 mm ( 10.6 mm in holotype), width at humeri 2.1–2.4 mm ( 2.4 mm in holotype).

HABITUS AND COLORATION. Body black brown. Pronotum and scutellum black, elytra dark red. Surface covered with decumbent red pubescence.

HEAD. Eyes small, interocular distance about 1.8 × as long as eye diameter. Antennae flabellate starting from antennomeres III, overlapping basal ¾ length of elytra when inclined. Antennomeres III‒XI lamellate, lamellae pointed at apices, lamella of III 0.7× as long as joint itself, lamella of VIII longest, 3.4× as long as joint itself ( Fig. 4D View Fig ).

PRONOTUM. Trapezoidal, 1.1× as wide as long. Anterior margin widely rounded and projecting anteriad, lateral margins feebly sinuate and posterior margin straight; anterior angles rounded, posterior angles sharp and moderately projected. Scutellum trapezoidal, nearly straight at apex ( Fig. 4D View Fig ).

ELYTRA. 3.8 × as long as humeral width. Costa I weak but visible at basal ⅔ length, costa II stronger than IV and both separated terminally at apical part of elytra, costa III visible only at the basal ¼ part ( Fig. 4D View Fig ).

AEDEAGUS. Phallus slender, nearly parallel-sided at basal part in dorsal and ventral views ( Fig. 3D–E View Fig ), subapical part strongly and almost symmetrically inflated laterally, about twice as wide as basal part, with an oval ventral-cavity, apical part gradually narrowed distad, apex about 0.25 × as wide as subapical part; curved ventrally at basal ⅓ portion, and bent dorsally at apical 4 / 7 portion in lateral view ( Fig. 3F View Fig ), subapical part feebly inflated ventrally, apical part slightly inclined dorsally and flat near apex.

Female ( Fig. 4E View Fig )

Similar to males, but larger in body size. Antennae serrate and shorter, reaching elytral midlength when inclined. Pronotum wider, 1.2× as wide as long, anterior angles obtuse-angled. Elytra wider and 3.6× as long as humeral width, costa II much stronger than IV and both fused terminally at apical part of elytra.

Distribution

China ( Guangxi).