Macrolycus expansus Y. Yang, Liu & X. Yang, 2024

Du, Ruolan, Yang, Yuxia, Yang, Xingke & Liu, Haoyu, 2024, Five new species of the Macrolycus ligulatus species-group from China (Coleoptera, Lycidae), ZooKeys 1208, pp. 315-330 : 315-330

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

Figs 3 B , 4 D – F

Diagnosis.

The species resembles M. guangxiensis Li, Bocak & Pang, 2015 in the general shape of the phallus, but differs in the longer lamella of male antennomere III, 0.9 times as long as the joint itself (Fig. 3 B ); phallus with subapical part strongly inflated laterally in ventral view (Fig. 4 E ), apical part strongly expanded ventrally in lateral view (Fig. 4 F ). In comparison, in M. guangxiensis the lamella of male antennomere III is shorter and 0.7 times as long as the joint itself ( Li et al. 2015: fig. 45), the subapical part of phallus is moderately inflated laterally in ventral view (Fig. 4 B ), and the apical part is moderately expanded ventrally in lateral view (Fig. 4 C ).

Etymology.

The specific name is derived from the Latin expansus (to expand), referring to its strongly expanded subapical part of the phallus.

Type material.

Holotype. China: ♂ ( IZAS), Zhejiang, Longquan, Fengyangshan, 29. vii. 2007, leg. L. K Tan.

Description.

Male (Fig. 3 B ). Length 9.3 mm, width at humeri 1.9 mm.

Body black. Pronotum, elytra and scutellum dark red. Surface covered with decumbent red pubescence (Fig. 3 B ).

Eyes small, interocular distance about 1.6 times greater than eye diameter. Antennae flabellate, overlapping basal 2 / 3 length of elytra when inclined. Antennomeres III – XI lamellate; lamella of III 0.9 times as long as joint itself and rounded apically; lamellae of IV – XI pointed at apices, lamella of IX longest, 3.9 times longer than joint itself (Fig. 3 B ).

Pronotum square, 1.2 times wider than long. Anterior margin widely rounded and projecting anteriad, lateral margins feebly sinuate and posterior margin bisinuate; anterior angles confluent with anterior margin, posterior angles sharp and moderately projected. Scutellum trapezoidal, feebly emarginate at apex (Fig. 3 B ).

Elytra 3.9 times longer than humeral width. Costae I and III weak but visible along its length, IV as strong as II (Fig. 3 B ).

Phallus slender (Fig. 4 D – F ), basal part stout and distinctly narrowed towards middle in dorsal and ventral views (Fig. 4 D, E ), subapical part strongly and asymmetrically inflated laterally, about 2.8 times as wide as basal part, with an oval ventral-cavity, apical part nearly parallel-sided, apex with a deep V-shaped notch, about 0.19 times as wide as subapical part; basal 1 / 3 part stout and curved ventrally in lateral view (Fig. 4 F ), subapical part moderately inflated ventrally, apical part distinctly expanded ventrally, with a tapered lamella.

Distribution

(Fig. 2 ). China (Zhejiang).

Figures

Figure 2. Distribution map of the Macrolycus ligulatus species-group in the world.

Figure 3. Habitus, dorsal views of Macrolycus guangxiensis Li, Bocak & Pang, 2015 (A) and M. expansus sp. nov (B). A female B male. Scale bars: 1.0 mm.

Figure 4. Aedeagi of Macrolycus guangxiensis Li, Bocak & Pang, 2015 (A – C) and M. expansus sp. nov. (D – F) A, D dorsal views B, E ventral views C, F lateral views. Scale bars: 1.0 mm.