Macrolycus graciliramus Y. Yang, Du & Liu, 2025

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

urn:lsid:zoobank.org:act:4DB1D779-6B9E-4291-8609-CA259A12D17D

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).