Intybia hainanensis Wang & Liu, 2024

Wang, Yuqi, Li, Zhiqiang, You, Ping & Liu, Zhenhua, 2024, Contribution to the Chinese Intybia Pascoe, 1866 (Coleoptera, Melyridae, Malachiinae), with descriptions of two new species groups and one new species, ZooKeys 1202, pp. 329-341 : 329-341

Intybia hainanensis Wang & Liu sp. nov.

Figs 1 , 2 A – C

Type material.

Holotype: China • ♂; Hainan, Ledong, Jianfengling ; 18.731273 ° N, 108.873082 ° E; 17 Mar. 2021; Yuchen Zhao leg; IZGAS . Paratype: • 1 ♂; same data as for holotype .

Diagnosis.

This species is similar to Intybia erectodentatus ( Wittmer, 1982) and Intybia klapperichi (Hicker, 1949) in body shape and colouration. It can be easily recognized by the shape of antennomere 3 (Fig. 1 C ), whose inner protrusion is pointed apically (blunt in the other two species).

Description.

Male. Length 2.0– 2.1 mm. Head yellow, with areas behind middle of eyes black on dorsal surface, frons with darker median spot (Fig. 1 B ); ventral surface with gular area more? or brownish. Mandibles yellow with black apex, maxillary palps and labial palps brownish. Antennae with antennomeres 1–4 yellow, remaining 7 segments brown. Pronotum and elytra black. Legs yellow with basal 4 / 5 of femora and apex of trochanters dark brown to black. Prosternum dark brown, mesoventrite and metaventrite black; abdominal ventrites dark brown with medial areas of ventrite 2–5 yellow (Fig. 1 A, D ). Vestiture of short yellowish setae.

Head widest across eyes, nearly as wide as pronotum; dorsal surface flat, covered with dense short setae, clypeus divided into sclerotized postclypeus and membranous anteclypeus; frons weakly depressed, slightly constricted in front of eyes. Eyes relatively large and laterally protruding. Antenna with 11 segments; scape subtriangular, elongated with slightly enlarged apex; antennomere 3 enlarged and suboval, inner edge with inwardly twisted projections; antennomeres 4–11 covered with short white setae. Labrum transverse, dorsal surface convex. Mandibles bidentate apically, slightly blunt, inner margin straight. Maxillary palps with 4 segments, last segment enlarged and obliquely truncated; labial palps 3 with segments, segment 1 very short, segment 3 conical.

Prothorax transverse; pronotum about 0.7 times as long as wide, widest at about basal third, distinctly constricted at base (Fig. 1 A ); anterior margin rounded and posterior margin nearly straight. Surface covered with short white setae. Prosternum short, protrochantins exposed. Procoxal cavities transverse and nearly contiguous, posteriorly open; procoxae enlarged and distinct protruding. Scutellum transverse with posterior margin slightly rounded.

Elytra about 1.4 times as long as wide, pear-shaped, widest at about anterior third; humeri rounded and slightly elevated. Surface covered with short white setae. Mesoventrite and metaventrite covered with white setae. Mesoventrite short and subtriangular; mesocoxal cavities large, contiguous at middle, laterally open to mesepimeron; mesocoxae subtriangular, apex slightly swollen, distinctly projecting. Metaventrite enlarged; discrimen distinct, not extending to center, lateral areas with punctures; metanepisternum broad, narrowed posteriorly. Metacoxae transverse, subtriangular, sharply narrowed beside trochanter.

Legs (Fig. 1 C ) slender, femora slightly enlarged at middle, covered with dense short setae; tibiae slender, with denser setae than femora, which is even denser on inner surface of fore tibiae. Tarsal formula 5–5 – 5; tarsomeres 3 and 4 slightly shorter than tarsomeres 1 and 2; tarsomere 5 longest, with pair of symmetrical small claws and membranous appendages.

Abdomen with 6 freely movable ventrites; ventrite 1 divided by metacoxae; ventrites 2–4 subequal in length and gradually decreasing in width. Ventrites 2–6 covered with white to light yellow setae on both sides, with longer setae on the last 2 ventrites. Tergite VIII (Fig. 2 C ) with apical margin broadly rounded, covered with sparse setae; sternite VIII (Fig. 2 B ) weakly connected at middle. Aedeagus (Fig. 2 A ) slender, narrowly rounded apically; endophallus with longitudinal sclerite about half as long as penis, curved near base, subapical area with numerous spinules.

Female. Unknown.

Etymology.

The species name is derived from the province Hainan, where the type specimens were collected.

Distribution.

Hainan.

Figures

Figure 1. Intybia hainanensis sp. nov., holotype A habitus, dorsal view B head, dorsal view C basal antennoeres, dorsal view D habitus, ventral view. Scale bars: 1 mm (A, B).

Figure 2. Intybia hainanensis sp. nov., paratype (A – C) and Intybia klapperichi (Hicker, 1949) (D – F) A, F aedeagus, dorsal view B, D sternite VIII C, E tergite VIII.