Miridiba (Pledina) lamellata Gao and Fang, 2019

Gao, Chuan-Bu, Li, Yan & Fang, Hong, 2019, Miridiba (Pledina) Lamellata Gao and Fang (Coleoptera: Scarabaeidae), a New Species from Guizhou, China, and a Key to the Chinese Species in the Genus, The Coleopterists Bulletin 73 (2), pp. 458-464 : 459-460

Miridiba (Pledina) lamellata Gao and Fang , new species

Zoobank.org/ urn:lsid:zoobank.org:act:347E0FC8-A00E-41C2-BA15-F02946ED3A69 ( Figs. 1–18 )

Description. Holotype Male. Length = 14.9 mm, width across humeri = 7.1 mm; strongly convex, body oval-elongate; dorsal surface of pronotum, scutellum, and elytra with 1 small seta in each puncture (shorter than diameter of puncture). Color: Head, pronotum, scutellum, and bases of elytra dark reddish brown; antennae, legs, most of elytra, and abdomen reddish brown ( Figs. 1, 2 ). Head: Antenna with 10 antennomeres; antennal club with 3 antennomeres, shorter (0.86X) than combined length of antennomeres 2–7 ( Fig. 3 ). Frons densely punctate. Clypeus with anterior margin distinctly emarginate medially and weakly reflexed. Fronto-clypeal suture clearly defined and sinuate ( Fig. 4 ). Frontal carina distinctly raised, weakly arcuate. Clypeus 1/3 shorter than frons; frons between eyes 5 times wider than eye. Mouthparts: Labrum strongly depressed medially ( Fig. 5 ). Mandibles each with wrinkled molar lobe laterally and incisor lobe with rounded notch in dorsal view ( Figs. 6, 7 ). Maxillae with well-developed teeth ( Fig. 8 ). Mentum with medial triangular notch on anterior margin flanked with dense, short setae ( Fig. 9 ). Thorax: Pronotal surface densely punctate, punctures on disc smaller than those on head; pronotum widest at posterior 2/5; anterior margin smooth and raised, with several setae; anterolateral margins crenulate; posterior margin smooth; anterior and posterior angles obtuse ( Fig. 10 ). Prosternal process trapezoidal, concave medially. Scutellum triangular, dorsal surface glabrous and densely punctate, 1.51 times wider than long. Ventral surface of thorax covered with long, soft setae. Dorsal surface of elytra nearly glabrous, discal costae absent, sutural costae developed; epipleura covered with few setae ( Fig. 2 ). Legs: Protibia tridentate, denticle 2 sharp; apical spur reaching basal 1/5 of protarsomere 1. Metafemora moderately covered with long setae near anterior and posterior margins. Outer surface of metatibia with a complete transverse carina at distal 2/5; dorsolateral margin of metatibia with 1 large, pubescent spine; dorsomedial margin with 4 spines; metatibial apical spurs unequal in length ( Fig. 11 ). Metatarsomere 1 shorter than metatarsomere 2. Apices of pro- and mesotarsomeres 1–4 densely microsetose ventrally ( Fig. 12 ). All claws with strong tooth at middle ( Fig. 13 ). Abdomen: Lateral margins of ventrites densely punctate and pubescent, ventrites 3‾6 with short setae; ventrite 5 with long, soft setae arranged in M near anterior margin. Pygidium: 1.40 times wider than long, punctate, clothed with short setae basally and longer setae apically ( Fig. 14 ). Male genitalia: Phallobase 1.28 times longer than parameres; basal fourth reduced, dorsal surface with a depressed sulcus medially. Parameres with 4 lamellar branches, 2 dorsal branches longer and wider than 2 ventral branches ( Fig. 15 ). Dorsal branches extended forward and curved inwards at distal ends ( Fig. 16 ); branches of parameres with a sharp tip ventrally; basal half of parameres with 3 folds ventrally ( Fig. 17 ). Endophallus with temones on dorsum and epithelium on distal end; epithelium covered with cone-shaped sensillae; temones reduced and well-separated; endophallus longitudinally wrinkled, sac-like ( Fig. 18 ). Spiculum gastrale T-shaped.

Diagnosis. Miridiba lamellata is distinguished from other Miridiba species by the following combination of characters: lamellar branches of the parameres; antennae composed of 10 antennomeres; dorsal surfaces of the head, pronotum, and elytra are punctate, each puncture with a minute seta; crenulate anterolateral margins of pronotum; apical pygidium with few long setae; outer surface of metatibia with complete transverse carina at distal two-fifths.

Type Locality. CHINA: Guizhou Province: Gauizhou .

Type Material. Holotype male, labeled “ Guizhou Gui Yang / 1979. 10. 6 / Yang Chenjin [handwritten, in Chinese] // 02 [handwritten] // HOLOTYPE ³ / Miridiba lamellata sp. nov. / Chuanbu Gao and Hong Fang / det. 2018 [typeset, red label]”, deposited in SYAU.

Chinese Name. 片脊鳃金龟

Remarks. Based on the antenna with 10 antennomeres, we classify M. lamellata in the subgenus Pledina . It is the second Chinese species placed in Pledina . It can be separated from Miridiba (Pledina) sinensis ( Hope, 1842) by the three criteria. Miridiba 460 sinensis has denser and longer setae ventrally on the have four branches, whereas there are two branches anterior portion of the mentum ( Fig. 19 ) compared to in M. sinensis ( Figs. 21, 22 ).

those on M. lamellata . The apex of the pygidium of Etymology. We name this species lamellata , the M. lamellata has long setae, while it is glabrous in M. feminine form of the Latin word for “lamellate”, in sinensis ( Fig. 20 ). The parameres of M. lamellata regards to the unique shape of the parameres.

Figures

Figs. 1–9. Miridiba lamellata. 1) Dorsal habitus; 2) Lateral habitus; 3) Antenna; 4) Head; 5) Labrum; 6) Mandible, lateral view; 7) Mandible, dorsal view; 8) Maxilla; 9) Mentum. Scale bar in Figs. 1–2 = 5 mm; in Figs. 3–9 = 1 mm.

Figs. 10–18. Miridiba lamellata. 10) Pronotum; 11) Metatibia; 12) Protarsus; 13) Hind claw; 14) Pygidium; 15) Parameres, lateral view; 16) Parameres, dorsal view; 17) Parameres, ventral view; 18) Endophallus. Scale bar = 1 mm.

Figs. 19–22. Miridiba sinensis. 19) Mentum; 20) Pygidium; 21) Parameres, dorsal view; 22) Parameres, lateral view. Scale bar = 1 mm.