Miridiba sus ( Moser, 1912 )

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 : 40-41

Miridiba sus ( Moser, 1912)

Figs 55–56

Holotrichia sus Moser, 1912: 443 (type loc.: Kuang-tri, Vietnam).

Hippotrichia hainana Arrow, 1948: 51 (type loc.: Hainan, China).

Holotrichia sus — Chang 1964: 146, 149–150, fig. 56 (species list; in key). — Frey 1970: 250 (in key).

Miridiba sus – Itoh 1995: 199, figs 7, 25 (combination). — Coca-Abia 2008: 682–683 (type material; in key). — Bezděk 2016: 272 (catalogue). — Gao et al. 2018: 16 (catalogue); 2019: 461 (species list; in key).

Hippotrichia hainana Arrow, 1948: 51 . — Chang 1964: 145 (as synonym of H. sus ). — Nomura 1977: 88. — Itoh 1995: 199. — Smetana & Král 2006: 222 (catalogue). — Bezděk 2016: 271 (catalogue).

Diagnosis

External morphology of adult ( Coca-Abia 2008). Head and elytra glabrous. Clypeus with anterior edge almost straight. Frontal carina strongly developed. Pronotal surface glabrous, except a tuft of brushshaped pubescence placed longitudinally on the middle line; anterior margin widely flanged with a concavity at each lateral end and pubescent; lateral margins smooth; anterior angles sharp and elevated laterally. Scutellum with lateral margins without punctures. Elytral surface glabrous, epipleuron with pubescence on basal half. Meso- and metatibia with transverse carina interrupted at middle; inner margin of dorsal surface without spines. Pygidium with scattered punctures, inconspicuous pubescence, conspicuous on apex, apical margin moderately raised. Ventrite 5 depressed at posterior half. Male genitalia with thin dorsal branches convergent at apices in dorsal view; apices of ventral branches sharp and abruptly curved outwards ninety degree. Endophallus with spines of different size at distal end. External morphology ( Fig. 55 ) and parameres ( Fig. 56 ) of H. hainana . Female genitalia not studied.

Material examined

Lectotype of H. hainana (here designated)

CHINA • ♂; Hainan; J. Whitehead leg.; “99. 315”; “ Miridiba hainana ( Arrow, 1948) CH. Bu Gao det. 2018”; BMNH .

Other material of M. sus

LAOS • 1 ♂; Muang sing near Haut-mekong; 18 Apr. 1918; R.V. de Salvaza leg.; BMNH .

Remarks

Itoh (1995) transferred this species to Miridiba and synonymized it with Hippotrichia hainana Arrow, 1948 without justification. Coca-Abia (2008) studied the types and indicated holotypes for M. sus (MFNB) and H. hainana (BMNH) . However, Moser (1912) and Arrow (1948) never indicated how many specimens they studied. Therefore, these holotype indications by Coca-Abia (2008) were incorrect (Art. 73.1 ICZN). Hence, the ‘holotypes’ remain syntypes, and other syntypes may be found. In fact, the first author of this work found a syntype of H. hainana in the BMNH collection, which is designated as lectotype herein. Miridiba sus shows features of the external morphology and male genitalia, which characterize Miridiba and morphotype I “ Trichophora ”. Thus, this species is included in this genital morphotype.

Distribution

China (Hainan); Laos; Thailand; Vietnam.

Figures

Figs 55–56. Hippotrichia hainana Arrow, 1948, lectotype (BMNH). 55. Habitus in dorsal view. 56. Parameres in dorsal (A) and lateral (B) views. Scale bars: 55 = 5.0 mm; 56 = 1.0 mm.