Macrolycus quartus Y. Yang, Du & Liu 2024, sp. nov.
Creators: name: Du, Ruolan
name: Yang, Yuxia
name: Yang, Xingke
name: Liu, Haoyu
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Lycidae
Macrolycus
Macrolycus quartus

description: Macrolycus quartus Y. Yang, Du & Liu sp. nov.
Figs 5 A, B, 6 A – C
Diagnosis.
The species resembles M. praecellens Kazantsev, 1993, but can be distinguished from the latter by the following characters: lamellae of antennomeres III and IV obtuse at apices (Fig. 5 A); phallus integrally stout (Fig. 6 A – C), apical part relatively long and moderately expanded ventrally in lateral view (Fig. 6 C). In contrast, in M. praecellens, lamellae of antennomeres III and IV are acute at apices (Kazantsev 1993: fig. 13); phallus is integrally slender, apical part is relatively short and strongly expanded ventrally in lateral view (Kazantsev 1993: fig. 12).
Etymology.
The specific name is derived from the Latin quartus (the fourth), referring to its antennomere IV truncated at apex.
Type material.
Holotype. China: ♂ (MHBU), Guangxi, Wuming, Damingshan, 1100 m, 27. v. 2011, leg. H. Y. Liu. Paratypes. 3 ♂ 9 ♀ (MHBU), same data as the holotype; 3 ♂ 7 ♀ (MHBU), Guangxi, Wuming, Damingshan, 1230–1422 m, 20. v. 2011, leg. H. Y. Liu.
Description.
Male (Fig. 5 A). Length 9.4–10.6 mm (10.0 mm in holotype), width at humeri 1.9–2.3 mm (2.2 mm in holotype).
Body black. Pronotum, elytra and scutellum dark red. Surface covered with decumbent red pubescence (Fig. 5 A).
Eyes small, interocular distance about 2.3 times greater than eye diameter. Antennae flabellate, overlapping basal 2 / 3 length of elytra when inclined. Antennomere III triangular and obtuse apically, about 2.5 times longer than wide; IV – XI lamellate, lamella of IV apically obtuse and lamellae of V – XI pointed at apices; lamella of IX longest, 3.8 times longer than joint itself (Fig. 5 A).
Pronotum square, 1.1 times wider than long. Anterior margin projecting anteriad and feebly emarginate at apex, lateral margins sinuate and posterior margin bisinuate; anterior angles rounded, posterior angles sharp and sharply projected. Scutellum trapezoidal, feebly emarginate at apex (Fig. 5 A).
Elytra 3.8 times longer than humeral width. Costa I weak, II as strong as IV, and III weak and visible only at humeri (Fig. 5 A).
Phallus slender (Fig. 6 A – C), nearly parallel-sided basally in dorsal and ventral views (Fig. 6 A, B), subapical part moderately and asymmetrically inflated laterally, about 1.89 times as wide as basal part, with an oval ventral-cavity, apical part progressively expanded distad, apex with a shallow V-shaped notch, about 0.54 times as wide as subapical part; basal 1 / 3 part feebly curved ventrally in lateral view (Fig. 6 C), subapical part inflated ventrally, apical part moderately expanded ventrally, with a square lamella.
Female (Fig. 5 B). Similar to male, but larger in body size. Length 11.5–13.9 mm, width at humeri 2.7–3.3 mm. Antennae serrate and shorter, overlapping elytral mid-length when inclined. Pronotum 1.2 times wider than long, anterior angles obtuse-angled.
Distribution
(Fig. 2). China (Guangxi).
description: Published as part of Du, Ruolan, Yang, Yuxia, Yang, Xingke & Liu, Haoyu, 2024, Five new species of the Macrolycus ligulatus species-group from China (Coleoptera, Lycidae), pp. 315-330 in ZooKeys 1208 on pages 315-330, DOI: 10.3897/zookeys.1208.125938