Orphninae

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.

Rediscovery of the enigmatic Stenosternus costatus from São Tomé Island

Figures 1–2. Stenosternus costatus Karsch, habitus in dorsal view and abdomen in ventral view. 1 — female, 2 — male.

Frolov, A. V. & Akhmetova, L. A. 2015. Rediscovery of the enigmatic Stenosternus costatus Karsch (Coleoptera: Scarabaeidae: Orphninae) from São Tomé island. Zootaxa, 4007, 440–444.

Stenosternus Karsch, 1881 is one of the least-known genera of the Orphninae scarab beetles. It was described from a single specimen of the odd-looking S. costatus Karsch, 1881, from the island of São Tomé, Gulf of Guinea, West Africa. Since then, no more findings of S. costatus have been reported... We discovered additional specimens of both sexes of S. costatus housed in the Museo Civico di Genova, Genova, Italy (MCGI) and California Academy of Sciences, San Francisco, California, United States of America (CASC). In this note we describe a female of S. costatus and discuss the species distribution and the taxonomic position of the genus.

A new genus and species of Orphninae associated with epiphytes in Andean cloud forest

Onorius inexpectatus

Frolov, A.V., Vaz-De-Mello, F.Z. 2015. A new genus and species of Orphninae (Coleoptera: Scarabaeidae) associated with epiphytes in an Andean cloud forest in Ecuador. Zootaxa, 4007 (3): 433–436

Orphninae (Coleoptera: Scarabaeidae) are represented in the New World by the tribe Aegidiini, which is comprised of four genera (Paulian 1984). Examination of material collected in Ecuador revealed a series of the Aegidiini specimens from an undescribed species that cannot be classified as a member of one of the known genera. The new species is herein described and a new genus is established. Apart from the distinctive morphological characters, the new taxon shows an unusual, for the Orphninae, association with canopy epiphytes.

A new species of Aegidium Arrow from the Atlantic forest ecoregion

Aegidium atlanticum, holotype

Frolov, A.V., Grossi, P.C., Vaz-De-Mello, F.Z. 2015. A new species of the genus Aegidium (Coleoptera, Scarabaeidae) from the Atlantic Forest ecoregion in South America. Zootaxa, 4007 (3), 437–439.

The New World genus Aegidium Arrow comprises mid-sized to rather large beetles belonging to 12 species. The genus is distributed up to southern Mexico in the north (Morón 1991) and A. cribratum chileanum Paulian was described from Chile, but Aegidium has not been recorded southeast of the Amazonia. An interesting discovery was made by one of us (P.C.G.) who collected one male Aegidium specimen in the Atlantic forest patch near Nova Friburgo (Rio de Janeiro State, Brazil) — the area separated from the yet known range of the genus by vast territories occupied by the Cerrado biome. Examination of this specimen showed that it belongs to an undescribed species and differs sharply from the other congeners in the shape of its aedeagus.

Onorius (Coleoptera, Scarabaeidae)

Onorius inexpectatus habitus of male

Medium-sized beetles with uniform black coloration. Dorsal surface shiny, punctate with rounded punctures. Clypeus symmetrical or subsymmetrical, slightly convex anteriorly. Mandibles of the same length, feebly visible in dorsal view. Labrum hidden under clypeus. Head without suturae and medial tubercle. Pronotum narrower than elytra in both sexes; lateral and basal margins bordered and widely rounded, posterior angles rounded, anterior margin not bordered. Disc of pronotum with a small fossa medioanteriorly in male, evenly convex in female. Elytra without distinct striae visible as either depressed lines or puncture rows, with well-developed humeral and apical humps. Scutellum triangular...

Description of the male of the rare Madagascan species Pseudorphnus hiboni

Frolov, A.V., Montreuil, O. 2006. Description of the male of the rare Madagascan species Pseudorphnus hiboni with notes on the genus Pseudorphnus (Coleoptera: Scarabaeidae: Orphninae). Zootaxa, 1154: 27-33. 

Abstract — A male of Pseudorphnus hiboni Paulian is described from material recently collected in Ranomafana National Park (eastern Madagascar). The species is compared with the two other known species of the genus. Notes on biology and distribution are given.

Taxonomic position of Sissantobius mandibularis

Frolov, A.V. 2005. Taxonomic position of Sissantobius mandibularis (Lansberge) and synonymy of Orphnus over Sissantobius (Coleoptera, Scarabaeidae, Orphninae). Journal of Afrotropical Zoology, 2: 69-72.

Examination of the holotype of Sissantobius mandibularis (Lansberge, 1886) shows that this species shares all the taxonomic characters of the genus Orphnus and is closely related to O. gilleti Benderitter. Synonymy of Orphnus MacLeay over Sissantobius Ritsema is therefore established.

Stenosternus Karsch, a possible link between Neotropical and Afrotropical Orphninae

1–3 Habitus of males 4 punctation of elytral disc 5 aedeagus in lateral view and parameres in dorsal view 6 serration of medial margins of parameres 7–10 aedeagus in ventral view 1, 4–7 Stenosternus costatus Karsch, holotype 2 Aegidium colombianum Westwood 3 Orphnus macleayi Laporte de Castelnau 8 Hybalus cornifrons (Brullé) 9 Aegidium parvulum Westwood 10 Orphnus compactus Petrovitz.Frolov, A.V. 2013. Stenosternus Karsch, a possible link between Neotropical and Afrotropical Orphninae (Coleoptera, Scarabaeidae). ZooKeys, 335: 33-46.   PDF (2.41 MB)

Abstract. The monotypical orphnine genus Stenosternus Karsch is known from a single specimen of Stenosternus costatus collected on the São Tomé island (Gulf of Guinea). The holotype of Stenosternus costatus Karsch is re-examined and its characters are discussed and illustrated. Although the genus was implicitly placed by Paulian (1984) in the Old World tribe Orphnini Erichson, re-examination of the holotype of Stenosternus costatus shows that it has characters similar to those of the members of the New World tribe Aegidiini Paulian. Placement of Stenosternus in the Aegidiini is supported by the metepisternum widened posteriorly (forming posterior metepisternal lock for closed elytra) and a keel separating basal and anterolateral parts of propleurae. Relationships of Stenosternus with other orphnine taxa and possible ways of origin of São Toméan orphnine fauna are discussed.

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