Macrolycus nigricollis Y. Yang, Liu & X. Yang, 2025

Macrolycus nigricollis Y. Yang, Liu & X. Yang sp. nov.

urn:lsid:zoobank.org:act:23F1E034-0B3F-4520-A49D-02B8790A8617

Figs 1 View Fig , 3A–C View Fig , 4A–B View Fig

Diagnosis

This species can be separated from other species of the M. gracilis group by a characteristic aedeagus with moderately robust phallus, which is nearly parallel-sided in the basal part in all views ( Fig. 3A–C View Fig ). The species most closely resembles M. aurantiacus Kazantsev, 2001 in the triangular antennomere III, but can be easily distinguished from the latter by the black pronotum and dark red elytra, while both pronotum and elytra are orange in M. aurantiacus ; phallus almost even in width in apical part in lateral view ( Fig. 3C View Fig ), and abruptly narrowed distad in M. aurantiacus ( Kazantsev 2001: fig. 9).

Etymology

The specific epithet is derived from the Latin ‘ niger ’ (‘black’) and ‘ collum ’ (‘neck’), referring to its uniformly black pronotum.

Type material

Holotype

CHINA • ♂; Zhejiang, Fengyangshan, Ludai ; 1123 m a.s.l.; 3 May 2021; Y. Kang and X.X. Wang leg.; HBU(E)410056; MHBU.

Paratypes CHINA • 1 ♂; Zhejiang, Tianmushan, Dahenglu ; 1200 m a.s.l.; 6 Jun. 1998; M.S. Zhao leg.; IOZ(E)2058406; IZAS • 1 ♂; Fujian, Chongan, Xingcun, Road of Sangang to Jianyang , Aotou ; 740– 1170 m a.s.l.; 20 May 1960; C.L. Ma leg.; IOZ(E)1119994; IZAS • 1 ♀; Fujian, Chongan, Xingcun ,

Sangang; 740 m a.s.l.; 25 May 1960; Y. R. Zhang leg.; IOZ(E)1120123; IZAS.

Description

Male ( Fig. 4A View Fig )

MEASUREMENTS. Length 7.8–10.0 mm (8.7 mm in holotype), width at humeri 1.7–2.3 mm (1.9 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 1.7 × as long as eye diameter. Antennae flabellate starting from antennomeres IV, overlapping basal ⅔ length of elytra when inclined. Antennomere III triangular and feebly longer than wide, IV‒XI lamellate, lamellae pointed at apices, lamella of IV as half long as joint itself, lamella of IX longest, 3.3× as long as joint itself ( Fig. 4A View Fig ).

PRONOTUM. Trapezoidal, 1.2 × as wide as long. Anterior margin widely rounded, lateral margins feebly sinuate and posterior margin bisinuate; anterior angles rounded, posterior angles sharp and feebly projected. Scutellum trapezoidal, emarginate at apex ( Fig. 4A View Fig ).

ELYTRA. 3.8 × as long as humeral width. Costa I weak but visible in whole length, costa IV as strong as II and both separated terminally, costa III visible only at the basal half part ( Fig. 4A View Fig ).

AEDEAGUS. Phallus slender, nearly parallel-sided at basal part in dorsal and ventral views ( Fig. 3A–B View Fig ), subapical part moderately and asymmetrically inflated laterally, about 1.45× as wide as basal part, with ventral, fusiform cavity, apical part gradually narrowed distad, apex about 0.38 × as wide as subapical part; curved ventrally at basal 2 /7 portion, and bent dorsally at apical 5 /14 portion in lateral view ( Fig. 3C View Fig ), subapical part moderately inflated ventrally, apical part nearly straight and flat near apex.

Female ( Fig. 4B View Fig )

Similar to males, but larger in body size. Antennae serrate and shorter, reaching elytral midlength when inclined, antennomere III feebly widened apically, about 2.5 × as long as wide. Pronotum narrower, 1.1× as wide as long. Elytral costa II stronger than IV and both fused then split terminally at apical part of elytra.

Variation within type series

Pronotum of some specimens has the posterior margin straight.

Distribution

China (Zhejiang, Fujian).