Miridiba (Miridiba) kuatunensis Gao & Fang, 2018

Gao, Chuan-Bu, Bai, Ming, Fang, Hong & Yu, Zhi-Guo, 2018, Four new species of the genus Miridiba Reitter (Coleoptera: Scarabaeidae: Melolonthinae) from China, Zootaxa 4527 (1), pp. 1-20 : 4-6

Miridiba (Miridiba) kuatunensis Gao & Fang , new species

( Figs. 2 , 6 )

Type locality. CHINA: Fujian Province: Wuyishan Mountain .

Type material examined. Holotype, male, labelled: “Guadun, Chong’an, Fujian / Chinese Academy of Sciences [handwritten or typeset, Chinese] // 1963. VII.10 / Collector Youwei Zhang [handwritten, Chinese] // Holotrichia pilosella Moser / Identified by Youwei Zhang 196I. VI [handwritten, Chinese] // IOZ (E)1967841 [typeset] // HOLOTYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang det. 2018 [typeset, red label]”, deposited in IZCAS; paratype, female: “Hujiang village, Fengyang Town, Lianxian County, Guangdong / Chinese Academy of Sciences [handwritten, Chinese] // 1965. 6. 17 / Chinese Academy of Sciences [typeset, Chinese] // Host: Vernicia fordii [ Euphorbiaceae , handwritten, Chinese] // PARATYPE ♀ / Miridiba kuatunensis sp. nov. ♀ Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Jiuniutang, Maoershan, Guangxi / Chinese Academy of Sciences [handwritten or typeset, Chinese] /1985. VII. 10 [handwritten] // IOZ (E) 2016208 [typeset] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. ♂ / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Ningde, Fujian / 80. 5. 29 [handwritten] // Fujian Forestry Department / Melolonthidae / 0 0 8 [handwritten or typeset, Chinese] // H. (P.) pilosella Moser [handwritten] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female; “Miaoxiao, Fujian / 81-6-20 [handwritten] // Fujian Forestry Department / Melolonthidae / 0 0 8 // H. (P.) pilosella Moser [handwritten or typeset, Chinese] // PARATYPE ♀ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label], deposited in IZCAS; paratype, male: “Beijing Museum of Natural History [typeset, Chinese] / Yanshan, Guangxi / Sikong Liu 1963. V. 28 [handwritten, Chinese] // Holotrichia pilosella Moser / Identified by Youwei Zhang 1988. VII. 11 [handwritten, Chinese] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Beijing Museum of Natural History [typeset, Chinese] / Qinglan, Hainan Island / Sikong Liu, 1965. II. 8 [handwritten, Chinese] // PARATYPE ♀ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “ 14 V. 33 S [handwritten] // FUKEIN / Jianou / Musée Heude [typeset] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “3247 / Songyang County, Zhejiang [handwritten, Chinese] // Holotrichia pilosella Moser 1991 . XI. 13 / Identified by Zhiliang Zhang [handwritten, Chinese] // SYAU (E) 0 0 8 / Jin 3. 28 [handwritten, Chinese] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in SYAU; paratype, male: “Fujian / Zhang Zhiliang / 1998.7 [handwritten, Chinese] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in SYAU; paratype, male: “Jiuniutang, Maoershan, Guangxi / Chinese Academy of Sciences [Chinese] // 1985. VII.9 / Collector Subai Liao [Chinese] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Chongan, Fujian [Chinese] / 80-6-9 / Collected by team 3 [Chinese] // Fujian Forestry Department / Melolonthidae / 0 0 8 [handwritten or typeset, Chinese] // H. (P.) pilosella Moser [handwritten] // PARATYPE ♀ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Jianyang, Aotou, Fujian [Chinese] / Chinese Academy of Sciences [Chinese] / 63. VI. 30 / Collector Youwei Zhang [handwritten] // Holotrichia pilosella Moser ♀ / Identified by Youwei Zhang [handwritten] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Xingcun Sangang, Chongan, Fujian / 740 m, Light / Chinese Academy of Sciences [handwritten or typeset, Chinese] // 1960. VI. 28 / Collector Yong Zuo [handwritten, Chinese] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 4 males and 6 females: “Dazhu, Yue / 900 – 1170 m / Chinese Academy of Sciences [handwritten or typeset, Chinese] // 28. V. 1960 / Jianhao Zhang [handwritten, Chinese] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female; “Fengyang, Hujiang / Lianxian, Guangdong / Chinese Academy of Sciences [Chinese] // 1965. V. 18 / Collector Youwei Zhang // Host Pyrus betulifoli a [ Rosaceae , handwritten, Chinese] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Beijing Museum of Natural History / Yanshan, Guangxi / Sikong Liu 1964.?. 7 [typeset or handwritten, Chinese] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS.

Description of holotype (male). Body length 17.3 mm, width across humeri 7.6 mm, body oval-elongate, strongly convex, dorsal surface densely setiferous, setae short.

Colour: Head, pronotum, scutellum and legs dark reddish brown; antennae, elytra and abdomen brown to dark brown ( Figs. 2a, b ).

Head: Frons densely punctate and setiferous; clypeus with anterior margin distinctly bilobed and reflexed; fronto-clypeal suture wave-shaped; frontal carina distinctly raised, weakly curved backwards; clypeus shorter than frons, length ratio between clypeus and frons before carina 0.56; distance between eyes three times wider than eye ( Fig. 2c ). Antenna with 9 antennomeres; club slightly longer than antennomeres 2–6 combined, length ratio 1.18 ( Fig. 2c ).

Thorax: Dorsal surface of pronotum densely punctate and setiferous (Fig. 11); pronotum widest at middle; anterior margin flanged, lateral sides serrated; lateral margin serrated and moderately reflexed; posterior margin smooth; anterolateral angles 90°, posterior angles obtuse ( Fig. 2d ); prosternal process tongue-shaped. Scutellum triangular ( Fig. 2e ), 1.4 times wider than long, dorsal surface covered with dense short setae. Dorsal surface of elytra covered with dense short setae, epipleuron with lots of cilia ( Figs. 2a, b ).

Legs: Protibia tridentate; denticle 2 and 3 sharp; dorsal carina forking to denticle 2 and 3; apical spur reaching basal one-fourth of protarsomere 1. Metafemora densely pubescent ( Fig. 2f ); distal 2/5 of outer side of metatibia with 1 transverse completed carina ( Fig. 2g ); dorsolateral margin with 1 thorn; dorsomedial margin with five thorns small to large; metatibia with two apical spurs of different sizes, spurs lanceolate shaped ( Fig. 2g ); metatarsomere 1 equal in length with metatarsomere 2.

Abdomen: Abdominal sternites densely covered with short setae.

Pygidium: Fan-shaped pygidium densely punctate and setiferous, setae short; 1.44 times wider than long, apical pygidium at a right angle.

Male genitalia. Phallobase: Phallobase 1.41 times longer than paramere; dorsal surface with a depressed longitudinal sulcus at middle; anterior 1/5 of phallobase constricted. Parameres: Dorsal surface of parameres with two ladder-shaped plates at basal 2/5 and two pairs of branches at apex; dorsal branches 1.5 times longer than ventral branches. Dorsal branches thick, extended forwards and curved inwards subapically, then divergent at apex; ventral branches slender, tips curved outwards and downwards ( Figs. 2h, i ). Endophallus: Dorsal endophallus with temones tapered; medial endophallus with some small hook-shaped spurs and densely punctate sensillae ( Fig. 2j ).

Female. Antenna with 9 antennomeres, club with 3 antennomeres; club equal in length to antennomeres 2–6 combined. Anterior metatibia slightly broader than in male.

Variability. The known paratypes slightly differ in size (total body length: 17.3–18.5 mm, width across humeri 7.6–8.5 mm).

Diagnosis. Miridiba (M.) kuatunensis new species is distinguished from M. (M.) pilosella (Moser, 1908) by the ratio between the dorsal branches and ventral branches of the parameres (1.25 in M. (M.) pilosella ; 1.5 in M. (M.) kuatunensis new species), and the curving of the dorsal branches of the parameres (the tips of the dorsal branches bent downwards, the angle of the bend is 55° in M. (M.) pilosella ; the apex of dorsal branches only curved downwards (30°) and moderately expanded in M. (M.) kuatunensis new species).

Distribution. China (Fujian: Jianou, Nanping, Ningde; Guangdong: Guangzhou, Qingyuan; Guangxi: Guilin; Hainan: Wenchang; Zhejiang: Lishui) ( Fig. 6 ).

Etymology. From the type locality, Guadun (= Kuatun) in Wuyishan of Fujian province.

Chinese name. 挂脊鳃金龟 Remarks. According to the information on the specimen collection labels, adults of M. (M.) kuatunensis new species feed on Vernicia fordii (Euphorbiaceae) and Pyrus betulaefolia (Rosaceae) .

Figures

FIGURE 2. Miridiba (M.) kuatunensis Gao & Fang, new species, holotype. a, habitus, dorsal view; b, habitus, lateral view; c, head, dorsal view; d, pronotum, dorsal view; e, scutellum; f, metafemora, ventral view; g, metatibia, lateral view; h, parameres, lateral view; i, parameres, dorsal view; j, endophallus. Scale bar: 5 mm for a, b; 1mm for c, d, f, g, j; 0.5 mm for e, h, i.

FIGURE 6. Distribution map for six Miridiba species in China.