Orphnus bicolor ( Fabricius, 1801 )

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 : 48

Orphnus bicolor ( Fabricius, 1801)

Fig. 4

Scarabaeus bicolor Fabricius, 1801: 9 .

Orphnus bicolor – MacLeay 1819: 119. — Westwood 1845: 176. — Lacordaire 1856: 130 (catalogue). — Gemminger & Harold 1869: 1072 (catalogue). — Arrow 1912: 29 (catalogue). — Schmidt 1913: 79 (catalogue). — Frolov 2012: 793 (catalogue).

Differential diagnosis

Orphnus bicolor is similar to O. parvus in having the pronotum without tubercle on base medially and endophallus with a few groups of spinules. It differs from the latter in having the parameres in dorsal view with small but distinct notches basad of the lateral teeth ( Fig. 4F ), longer parameres (about 0.7 length of phallobase [ Fig. 4E ] as opposed to 0.5 length of phallobase in O. parvus [ Fig. 5E ]), and abdominal sternite 8 medially longer than sternites 4–7 combined (as opposed to sternite 8 medially as long as sternites 4–7 combined in O. parvus ).

Type material

Lectotype (here designated, Fig. 4 A – F ) INDIA • ♂; “TYPE / Ind. orient. Daldorff Mus. T. Lund Geotrupes bicolor F. / Lectotype Geotrupes bicolor F. A.Frolov des. 2016”; ZMUKG .

Paralectotype INDIA • 1 ♂; “TYPE / Paralectotype Geotrupes bicolor F. A.Frolov des. 2016”; ZMUKG .

Additional material examined

SRI LANKA – Central Province • 1 ♂; Weragamtota ; 7°19′ N, 80°59′ E; 13 Sep. 1953; F. Keiser leg.; NHMB . – Southern Province • 1 ♂, 1 ♀; Tissamaharana ; 6°17′ N, 81°17′ E; 30 Oct. 1983; MNHN .

Variation

Body length of the examined specimens varies from 7.5 to 9.0 mm (males) and 8.6 mm (female).

Distribution

The species was described form “East India ”. In Sri Lanka, it is known from two rather distant localities in the centre and on the southern coast ( Fig. 4I ).

Figures

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.