Orphnus

Revision of the subgenus Orphnus (Phornus)

Fig. 1. Orphnus (Phornus) spp. A–M. O. giganteus. N. O. renaudi. O. O. ferrierei. P. O. valeriae. Q. O. parastrangulatus. R. O. strangulatus.

Frolov, A. V. & Akhmetova, L. A. 2016. Revision of the subgenus Orphnus (Phornus) (Coleoptera, Scarabaeidae, Orphninae). European Journal of Taxonomy 241: 1–20

The Afrotropical subgenus Phornus Paulian of the genus Orphnus Macleay is revised and currently comprises six species. Four new species are described: Orphnus renaudi, Orphnus valeriae,Orphnus ferrierei,and Orphnus parastrangulatus. The subgenus is characterized by the coarse stridulatory field, sclerotized plate on the second abdominal sternite near plectrum, absence of the pronotal lateral processes in males, rounded apices of the parameres and endophallus without armature, although some of these characters differ in O. giganteus. Symphysocery is reported for the first time for members of the Orphninae. In O. giganteus, the majority of specimens have malformed antennomeres. Four of the six species of Phornus are brachypterous and all species except for O. giganteus Paulian are known only from males. A key to Phornus species and a map of their localities are provided.

A new brachypterous scarab species, Orphnus longicornis from East African Rift

Figures 1–7. Orphnus longicornis.

Frolov, A. V. & Akhmetova, L. A. 2015. A new brachypterous scarab species, Orphnus longicornis (Coleoptera: Scarabaeidae: Orphninae), from the East African Rift. Zootaxa, 4039(3): 475–477

Examination of the material housed in the Museum of Natural History of Humboldt-Universität, Berlin, Germany (ZMHUB), revealed a series of brachypterous Orphnus beetles belonging to an undescribed species.

A new apterous species of the genus Orphnus from South Africa

Figs. 1–2: Orphnus harrisoni habitus; Fig. 3: O. harrisoni aedeagus in dorsal and lateral view; Fig. 4: O. luminosus habitus; Fig. 5: O. luminosus aedeagus in dorsal and lateral view. Frolov, A.V. 2008. A new apterous species of the genus Orphnus MacLeay (Coleoptera: Scarabaeidae: Orphninae) from South Africa. Zootaxa, 1855: 65–68.

A new apterous species of the genus Orphnus MacLeay, 1819, is described from Little Karoo (South Africa).  The new species can be separated from closely related O. luminosus Benderiter, 1920, by the shape of the parameres and sculpture of the head and pronotum.

Genus Orphnus (Scarabaeidae, Orphninae)

Orphninae, Orphnus angolensis Quedenfeldt, 1884

Small to rather large beetles (length 5–25 mm). Color uniformly brown to black. Clypeus of males of most species with more or less pronounced horn having, in case of full development in some species, a species-specific shape. Shape of pronotum varies from simply convex to having 2 more or less developed longitudinal ridges and an excavation between the ridges. Similar to clypeal horns, pronotal ridges are subject to both interspecific and intraspecific allometric variability which can only be assessed if large series of beetles are examined. Elytra convex, without ridges, more or less densely punctate with rounded punctures. In some species punctures mark elytral stria on disc, but most species have only 1st (sutural) stria distinct. Anterior tibiae normally with 3 strong outer teeth. Lateral margin basad of outer teeth not crenulated. Middle and posterior legs similar in shape; posterior femora and tibiae about 1/8 longer than middle ones. Parameres of many species are simple, flattened and tapering apically, with 1 lateral tooth near apex of each paramere. In many species the paramere shape reasonably deviates from this common type and is species-specific...

Diagnosis, classification, and phylogenetic relationships of the orphnine scarab beetles

Fig. 1. Orphnus spp. and Allidiostoma spp.

Frolov, A.V. 2012. Diagnosis, classification, and phylogenetic relationships of the orphnine scarab beetles (Coleoptera, Scarabaeidae: Orphninae). Entomological Review, 92, 782-797. PDF (1.07 MB)

Abstract — Orphnine scarab beetles (Orphninae) are widely distributed in tropical and subtropical regions of southern continents except for Australia. Catalogue of nominal taxa of orphnines includes 2 tribes, 15 genera, and 193 species. Diagnosis of the group, based on adult morphological characters, is as follows: antennae 10-segmented with 3-segmented club; mandibles with 2-4 scissorial teeth and well developed mola; labrum and mandibles protruding past clypeus and can be seen from above; scutellum well developed in winged species, reduced but distinct in wingless species; wings with distinct anal area; apices of anterior tibia in males without spur but normally with a few robust setae; anterior coxa with longitudinal hollow on anterior surface; tarsi with 2 similar claws; middle and hind tibiae with 2 apical spurs; 2 abdominal sternite with sub-triangular to rounded plectrum; dorsal surface of hind coxae with oval flat stridulatory file; pygidium partly hidden under elytra; parameres symmetrical; ...