Miridiba dohrni (Brenske, 1894)

Gao, Chuan-bu & Coca-Abia, María Milagro, 2021, Revision of the genus Miridiba Reitter, 1902 (Coleoptera, Scarabaeidae, Melolonthinae): genital morphotypes and new taxonomic data, European Journal of Taxonomy 749, pp. 1-94 : 52-54

Miridiba dohrni (Brenske, 1894)

Figs 69–72

Holotrichia dohrni Brenske, 1894b: 277 (type loc.: Deli, Sumatra). Holotrichia dohrni – Dalla Torre 1912: 202 (catalogue). Miridiba dohrni – Matsumoto 2016: 3, figs 4–8 (combination).

Diagnosis

External morphology of adult ( Fig. 69 ). Body size 23–25 mm. Dorsal surface glabrous, shiny appearance. Clypeus flat, oblique sides, anterior edge emarginate at middle. Frons with continuous carina. Pronotal surface densely punctate; anterior margin glabrous, narrowed at middle and at sides, without concavities at lateral ends; posterior margin glabrous, at most with very short setae at sides; lateral margins smooth, glabrous and with anterior third reflexed upwards; anterior and posterior angles almost right and rounded, respectively. Elytra shiny, punctures denser at base than apices; epipleuron with a few short setae at basal part. Foretibia with gently carina. Meso- and metatibia with incomplete transverse carina; inner margin of dorsal surface without spines. Pygidium heart-shaped, densely punctate, with a central depression in male; pygidium concave, moderately punctate and with two strong pointed protuberances in females, glabrous, only short setae along apical margin at both sexes. Ventrites 3 and 4 with sparse pubescence and inconspicuous punctures. Ventrite 5 strongly depressed at posterior half in males; moderately depressed in females, with pubescence of different length at both sexes, with conspicuous punctures. Ventrite 6 bulging anteriorly, with long pubescence near posterior margin. Male genitalia: parameres ( Fig. 70 ) with short dorsal branches separated each other and blunt apices; ventral branches longer than dorsal ones, divergent, arcuate, each one with a spine at proximal position. Endophallus covered with sensilla, denser at distal end, without spines ( Fig. 71 ). Female genitalia ( Fig. 72 ). Gonopore fold with a strong quadrangular sensory plate. Vestigial sternites reduced with sensillae.

Material examined

Lectotype (here designated)

INDONESIA • ♂; “ Sumatra, Deli”; “Dohrni Brensk”; “SYNTYPUS Holotrichia dohrni Brenske, 1894 labelled by MNHUB 2015”; “Lectotype Miridiba dohrni (Brenske 1894) Chuan-bu Gao & Coca-Abia det. 2019”; MFNB.

Paralectotypes (here indicated) INDONESIA • 1 ♂; “Soekaranda Januar 1894 Dohrn”; “Coll Brenske”; “ Holotrichia Dohrni Brnsk ”; “SYNTYPUS Holotrichia dohrni Brenske, 1894 labelled by MNHUB 2015”; “Paralectotype Miridiba dohrni (Brenske 1894) Chuan-bu Gao & Coca-Abia det. 2019”; MFNB • 1 ♀; “Deli Sumatra ”; “Coll Brenske”; “ Holotrichia Dohrni Brnsk ”; “SYNTYPUS Holotrichia dohrni Brenske, 1894 labelled by MNHUB 2015”; “Paralectotype Miridiba dohrni (Brenske 1894) Chuan-bu Gao & Coca-Abia det. 2019”; MFNB.

Remarks

Matsumoto (2016) studied three syntypes of Holotrichia dohrni (two males and one female), transferred this species to Miridiba and considered M. dohrni closely allied to Miridiba gravida ( Sharp, 1881) . We have studied three syntypes (MFNB) and designated them as a lectotype and two paralectotypes. Also, we agree with the transfer of H. dohrni to Miridiba and the similarities between M. leucophthalma and M. gravida . Male genitalia matches morphotype III “ Leucophthalma ” above described. Hence, this species is included in this genital morphotype.

Distribution

Indonesia (Sumatra).

Figures

Figs 69–72. Miridiba dohrni (Brenske, 1894). 69–71. Lectotype, ♂ (MFNB). 72. Non-type, ♀ (MFNB). 69. Habitus in dorsal view.70. Parameres in dorsal (A), ventral (B) and lateral (C) views.71. Endophallus and temones in dorsal view. 72. Female genitalia, in dorsal view. Scale bars: 69 = 5.0 mm; 70–72 = 1.0 mm.