Orphnus, Macleay, 1819

Frolov, Andrey V. & Akhmetova, Lilia A., 2021, Review of the Orphninae (Coleoptera: Scarabaeidae) of Sri Lanka, with description of a new species of genus Orphnus Macleay, 1819, European Journal of Taxonomy 767 (1), pp. 40-54 : 52

Key to species of Orphnus from Sri Lanka (males)

1. Pronotum with more or less developed tubercle on base medially ( Figs 1A–B , 2A–C , 3A–C ). Endophallus with 1 group of spinules ( Figs 1G , 3G ) ....................................................................... 2

– Pronotum without tubercle on base medially ( Figs 4A, H , 5A, H ). Endophallus with more than 1 distinct group of spinules ( Figs 4D , 5D ) .......................................................................................... 3

2. Larger: body length 8.0–10.0 mm. Spinules of endophallus as a rather dispersed group of more than 10 spinules ( Fig. 1G ). Tubercle on base of pronotum normally with 2 punctures; punctures may be close to each other or indistinct in some specimens ............. Orphnus mysoriensis Westwood, 1845

– Smaller: body length 4.6–6.0 mm. Spinules of endophallus in a compact cluster consisting of less than 10 spinules ( Fig. 3G ). Tubercle on base of pronotum smooth ...... Orphnus medvedevi sp. nov.

3. Parameres in dorsal view with small but distinct notches basad of lateral teeth ( Fig. 4F ). Parameres longer, about 0.7 length of phallobase ( Fig. 4E ). Abdominal sternite 8 medially longer than sternites 4–7 combined ............................................................................... Orphnus bicolor ( Fabricius, 1801)

– Parameres in dorsal view without notches basad of lateral teeth ( Fig. 5G ). Parameres shorter, about 0.5 length of phallobase ( Fig. 5F ). Abdominal sternite 8 medially as long as sternites 4–7 combined .................................................................................. Orphnus parvus ( Wiedemann, 1823)

Figures

Fig. 1. Orphnus mysoriensis Westwood, 1845. A–E, G. Lectotype, ♂ (OUM). F. Paralectotype, ♀ (OUM). A–B, F. Habitus in dorsal view. C. Labels. D. Aedeagus in lateral view. E. Parameres in dorsal view. G. Endophallus. H. Distributional record map. Scale bars: A–B, F = 1.0 mm; D–E, G = 0.5 mm.

Fig. 2. Orphnus mysoriensis Westwood, 1845. A–C. ♂ (NHMB). D. ♀ (NHMB). E–G. Lectotype of Orphnus detegens Walker, 1859, ♂ (BMNH). A–F. Habitus in dorsal view. G. Labels. Scale bars = 1.0 mm.

Fig. 3. Orphnus medvedevi sp. nov. A, D–G. Holotype, ♂ (ZIN). B–C. Paratypes, ♂ (ZIN). H. Paratype, ♀ (ZIN). A–C, H. Habitus in dorsal view. D. Parameres in dorsal view. E. Aedeagus in lateral view. F. Labels. G. Endophallus. I. Distributional record map. Scale bars: A–C, H = 1.0 mm; D–E, G = 0.5 mm.

Fig. 4. Orphnus bicolor (Fabricius, 1801). A–F. Lectotype, ♂ (ZMUKG). G–H. ♀ (MNHN). A–B, G–H. Habitus in dorsal view. C. Labels. D. Endophallus. E. Aedeagus in lateral view. F. Parameres in dorsal view. I. Distributional record map. Scale bars: A–B, G–H = 1.0 mm; D–F = 0.5 mm.

Fig. 5. Orphnus parvus (Wiedemann, 1823). A–C. Lectotype, ♂ (ZMUKK). D–H. Lectotype of Orphnus nanus Westwood, 1845, ♂ (ZMUKK). I. ♀ (MNHN). A–B, H–I. Habitus in dorsal view. C, E. Labels. D. Endophallus. F. Aedeagus in lateral view. G. Parameres in dorsal view. J. Distributional record map. Scale bars: A–B, H–I = 1.0 mm; D, F–G = 0.5 mm.