Stenosternus Karsch, a possible link between Neotropical and Afrotropical Orphninae (Coleoptera, Scarabaeidae)

By

Frolov, Andrey

Type

Article

Date of Publication

2013

Original Publication

ZooKeys

Volume

335

Pages

33-46

Subjects

Aegidiini , Africa–America disjunction , Biogeography , Cameroon line , Gulf of Guinea , orphnines , Orphnini , São Tomé , scarab beetles , Trans-Atlantic dispersal

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.335.5471

 

Abstract

The monotypical orphnine genus Stenosternus Karsch is known from a single specimen of S. costatus collected on the São Tomé island (Gulf of Guinea). The holotype of S. 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 S. 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.