Miridiba pilosella ( Moser, 1908 )

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 : 37-39

Miridiba pilosella ( Moser, 1908)

Figs 51–54

Holotrichia pilosella Moser, 1908: 336 (type loc.: Mount Mẫu SƠn, Vietnam).

Holotrichia formosana Moser, 1909: 470 (type loc.: Taiwan, China). syn. nov.

Holotrichia pilosella – Dalla Torre 1912: 205 (catalogue). — Chang 1964: 146, 149–150, figs 48–49 (species list; in key). — Frey 1970: 248 (in key).

Miridiba pilosella – Nomura 1977: 88. — Coca-Abia 2008: 681 (combination). — Gao et al. 2018: 15 (catalogue); 2019: 461 (species list; in key).

Holotrichia formosana – Dalla Torre 1912: 202 (catalogue). — Chang 1964: 146, 149–150, figs 46–47 (species list; in key).

Neodontocnema formosana – Arrow 1948: 51 (combination).

Miridiba formosana – Nomura 1977: 88 (combination). — Smetana & Král 2006: 222 (catalogue). — Coca-Abia 2008: 679, 683, figs 14–16 (type material; in key). — Li et al. 2015: 523 , 528, figs 4, 10, 16, 22, 31–32 (redescription; in key). — Bezděk 2016: 271 (catalogue). — Gao et al. 2018: 13 (catalogue); 2019: 461 (species list; in key).

Diagnosis

External morphology of adult ( Fig. 51 ). Body size 17.4–19.0 mm. Dorsal surface with conspicuous short pubescence. Clypeus flat with anterior edge moderately emarginate at middle, oblique laterally. Frons with sharp carina, not interrupted at middle. Pronotal anterior margin with short setae, without concavity at lateral ends; posterior margin glabrous; lateral margins strongly serrated with short setae; anterior angles acute almost right, rounded, not projected forward; posterior angles obtuse and rounded. Prosternal process with a ventral bulge and posterior margin rounded. Scutellum densely punctate. Elytra with punctures regularly distributed, more scattered and larger than those of pronotum; epipleuron with long marginal setae except on apex. Foretibia with sharp dorsal carina, insertion of inner spur closer third outer tooth than second one. Meso- and metatibia with interrupted and complete transverse carina, respectively; inner margin of dorsal surface with strong spines. Pygidium with rough punctures, dense pubescence and irregular in length. Abdominal ventrites covered with dense, short and decumbent setae and punctures regularly distributed. Male genitalia: parameres ( Fig. 52 ) with sparse setae on ventral side of dorsal branches and on dorsal side of ventral ones; in lateral view dorsal branches moderately bent at two stretches towards apices, which are curved downward with a small apical tip; ventral branches with apices curved outward. Endophallus ( Fig. 53 ) with spines arranged helicoidally around internal walls towards distal end, with a raspula of dark sensillae at proximal half of sac. Apophysis of temones ( Fig. 53 ) with distal ends separated from each other. Female genitalia as describe at morphotype I. Genital chamber with a pair of vestigial sternites reduced to few sensillae, median oviduct very developed with hardened epithelium and dark sclerotized areas ( Fig. 54 ).

Material examined

Lectotype (here designated)

VIETNAM • 1 ♂; “Tonkin, Montes Mauson” [Tonkin, centre of Vietnam; Montes Mauson, Mount Mẫu SƠn]; “April Mai” [Apr.–May]; “2-3000’ H. Fruhstorfer; 100753”; “ H. pilosella Mos ”; “Lectotype Miridiba pilosella ( Moser, 1908) Chuan-bu Gao & Coca-Abia det. 2018”; MFNB.

Paralectotypes (here indicated)

VIETNAM • 2 ♂♂, 3 ♀♀; same collection data as for lectotype; “Paralectotype Miridiba pilosella ( Moser, 1908) Chuan-bu Gao & Coca-Abia det. 2018”; MFNB .

Other material

CHINA • 1 ♀; Guangzhou; Lehmann S. leg.; MFNB .

VIETNAN • 1 ♂; Tonkin; H. Fruhstorfer leg.; MFNB .

Remarks

Moser (1908) did not indicate the number of specimens used in describing Holotrichia pilosella . We have studied a series of specimens (MFNB), two of them labelled as types by the author and another five specimens with the same collection data, which belong to the type series. We designate the lectotype and five paralectotypes. On the other hand, Miridiba formosana ( Moser, 1909) was transferred to Miridiba by Nomura (1977), and a lectotype and two paralectotypes were studied and were designated by Coca- Abia (2008). After studying the types of M. pilosella , we noted that features of the external morphology and male genitalia of M. formosana ( Moser, 1909) ( Coca-Abia 2008) match well those of M. pilosella . These characters are body pubescence (short and decumbent), head (clypeus shape, frontal suture and carina), pronotum (pubescent anterior margin, crenulate and pubescent lateral margins), foretibiae (strongly carinate), pygidium (conspicuous punctures and pubescence), male genitalia (parameres shape, internal structures of endophallus and temones shape). Therefore, we here synonymize M. formosana with M. pilosella and include it in morphotype I “ Trichophora ”, from its antenna 9-segmented and male and female genital morphology.

Distribution

China (Anhui, Guangzhou, Fujian, Guangxi, Guizhou, Hebei, Hubei, Jiangsu, Jiangxi, Liaoning, Shandong, Shanxi, Sichuan, Taiwan, Zhejiang) ( Gao et al. 2018), Vietnam.

Figures

Figs 51–54. Miridiba pilosella (Moser, 1908). 51. Lectotype (MFNB). 52–54. Paralectotypes (MFNB). 51. Habitus in dorsal view. 52–53. Male genitalia. 52. Parameres in dorsal (A) and lateral (B) views. 53. Endophallus and temones in dorsal view. 54. Female genitalia in dorsal view. Scale bars: 51 = 5.0 mm; 52–54 = 1.0 mm.