Miridiba bidentata ( Burmeister, 1855 )

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 : 55-57

Miridiba bidentata ( Burmeister, 1855)

Figs 9–10 , 73

Ancylonycha bidentata Burmeister, 1855: 316 (type loc.: Ula-Liman-Manis, Sumatra).

Lachnosterna convexa Sharp, 1881: 228 .

Holotrichia behrensi Brenske, 1892: 165 .

Holotrichia bidentata – Brenske 1894b: 278 (combination). — Dalla Torre 1912: 201 (catalogue).

Lachnosterna convexa – Arrow 1944: 636 (as synonym of H. bidentata ).

Miridiba bidentata – Matsumoto 2011: 3, figs 2, 4, 6–7, 13 (combination).

Holotrichia behrensi – Matsumoto 2016: 3, figs 1–3 (as synonym of H. bidentata ).

Diagnosis

External morphology of adult of M. behrensi ( Fig. 73 ). Body size 19.8–20.5 mm. Dorsal surface glabrous. Clypeus shorter than frons, moderately concave, oblique lateral sides, anterior edge deeply emarginate at middle. Frons with strong carina interrupted at middle. Pronotum with anterior margin glabrous, strongly flanged, thinner at middle and absent at lateral ends; posterior margin glabrous; lateral margins glabrous, moderately crenulated with anterolateral part gently flexed upwards; anterior angles obtuse and marked, not projected forward, posterior angles obtuse and strongly rounded. Prosternal process arrowhead-shaped. Scutellum glabrous, heart-shaped. Elytra more densely punctate at base than at apices; epipleuron glabrous. Foretibia with dorsal carina moderately developed; insertion of inner spur closer to third outer tooth than second one. Meso- and metatibia with transverse carina interrupted at middle and complete, respectively, inner margin of dorsal surface with small spines. Prepygidium irregularly punctate, anterior area finely wrinkled with small punctures among wrinkles, posterior area coarsely punctate, glabrous. Pygidium surface with scattered punctures irregularly distributed, surface glabrous, at most with short setae in each puncture hardly visible, with pubescence on apical margin. Ventrites conspicuously punctate. Ventrite 2 with pubescence, short, reclined, thick and whitish. Ventrites 3 and 4 glabrous. Ventrite 5 moderately depressed at posterior half, with pubescence longer and punctures denser at depressed area. Male genitalia as described in morphotype IV “ Bidentata ”. Parameres ( Fig. 9 ) with dorsal branch narrowed at apex, with a rounded tip curved downward. Ventral branches with elevations as waves at outer margin, apices expanded. Endophallus ( Fig. 10 ) without raspulae, with two strong spines at distal end and other four smaller along sack. Apophysis of temones short with distal ends extend laterally surrounding endophallus partially (T-shaped) ( Fig. 10 ). Female unknown.

Material examined

Lectotype of M. behrensi (here designated) INDONESIA • ♂;“ Sumatra, Ula-Liman-manis 600 D. Behrens ”; “ Coll. Brenske ”; “Syntypus Holotrichia behrensi Brenske, 1982 labelled by MNHUB 2015”; “Lectotype Miridiba behrensi ( Brenske, 1892) Chuan-bu Gao & Coca-Abia det. 2017”; MFNB .

Paralectotype of M. behrensi (here indicated) INDONESIA • ♂; “ Sumatra, Ula-Liman-manis”; “ Behrensi Brsk.”; “ Coll. Brenske ”; “es Ex. gleicht in Halsschildform der | Type, welche Behrensi Brsk. = convexa Sharp ”; “Syntypus Holotrichia behrensi Brenske, 1892 labelled by MNHUB 2015”; “Paralectotype Miridiba behrensi ( Brenske, 1892) Chuanbu Gao & Coca-Abia det. 2017”; MFNB.

Other material

UNKNOWN DATA • 1 ♂ of Ancylonycha bidentata ; MLUH .

Remarks

Matsumoto (2011) studied a series of male and female specimens collected from Malaysia, Thailand and Sumatra, and identified them as Holotrichia bidentata . Although the type specimens were not inspected, Matsumoto (2011) transferred this species to Miridiba . Later, Matsumoto (2016) synonymized Holotrichia behrensi Brenske, 1892 with Miridiba bidentata after studying the types of H. behrensi only. We have examined a male specimen, preserved in collection MLUH with the genitalia in poor condition, identified as H. bidentata by an old handwritten label. Burmeister (1855) described this species from Java as belonging to Ancylonycha . The fact that the type locality (Java) does not appear on any labels, and the identification on the old handwritten label is H. bidentata and not A. bidentata casts doubt on whether it is a type specimen. Thus, we consider that the specimen of H. bidentata from MLUH is not a type. Then, it is not possible to confirm or reject the transfer of H. bidentata to the genus Miridiba ( Matsumoto 2011) , or the synonymy of H. behrensi with A. bidentata ( Matsumoto 2016) until types of A. bidentata are studied. Therefore, we maintain the taxonomic status of H. bidentata and M. behrensi as currently established ( Matsumoto 2011, 2016). We establish the genital morphotype IV “ Bidentata ” based on male characters of M. behrensi . On the other hand, we have studied two male syntypes of H. behrensi from MFNB and they show features that characterize the genus Miridiba . Moreover, we designate them as lectotype and paralectotype herein.

Distribution

Indonesia (Java, Sumatra).

Figures

Figs 9–11. Morphotype IV “Bidentata”. 9–10. Male genitalia of M. behrensi Brenske, 1892, lectotype (MFNB). 9. Parameres in dorsal (A), ventral (B) and lateral (C) views. 10. Endophallus and temones in ventral view. 11. Female genitalia of M. saigonensis (Moser, 1912),?syntype (MFNB) in dorsal (A) and ventral (B) views. Scale bars = 1.0 mm.

Figs 73–76. 73. Miridiba behrensi Brenske, 1892, lectotype, ♂ (MFNB), habitus in dorsal view. 74– 76. M. saigonensis (Moser, 1912), lectotype, ♂ (MFNB). 74. Habitus in dorsal view. 75. Parameres in dorsal (A), ventral (B) and lateral (C) views. 76. Endophallus and temones in ventral view. Scale bars: 73–74 = 5.0 mm; 75–76 = 1.0 mm.